Deep-water Ophiuroidea (Echinodermata) from off Chile in the Eastern South Pacific

Transcription

1 Biot Neotrop., vol. 10, no. 2 Deep-wter Ophiuroide (Echinodermt) from off Chile in the Estern South Pcific Cynthi Lr de Cstro Mnso 1,2 1 Lortório de Inverterdos Mrinhos LABIMAR, Deprtmento de Biociêncis, Universidde Federl de Sergipe UFS, Cmpus Prof. Alerto Crvlho, Av.Veredor Olímpio Grnde, s/n, CEP , Itin, SE, Brzil 2 Corresponding Author: Cynthi Lr de Cstro Mnso, e-mil: cynthi@phoenix.org.r MANSO, C.L.C. Deep-wter Ophiuroide (Echinodermt) from off Chile in the Estern South Pcific. Biot Neotrop. 10(2): /v10n2/en/strct?inventory+n Astrct: The ophiuroids collected during the Ocenogrphic Expedition PUCK (SONNE-156) in 2001, in the frmework of the project Interctions etween productivity nd environment long the Chilen continentl shelf were nlyzed. Eight smples hd ophiuroids; Fifteen species were distriuted in the following fmilies: Gorgonocephlide (2), Asteronychide (2), Ophiomyxide (1), Ophicnthide (2), Ophiuride (5), Amphiuride (1), nd Ophiolepidide (2). Four species were recorded for the first time from Chilen wters, i.e., Asteronyx loveni Müller & Troschel, Astrodi tenuispin Verrill, Ophiolimn irdi (Lymn), nd Ophiocten mitinum Lymn, nd three re new, i.e., Ophiur (Ophiuroglyph) rntzi sp. nov., Amphiophiur gllrdoi sp. nov., nd Stegophiur wilhelmi sp. nov. Keywords: ophiuroid, deep-wter, Chilen continentl mrgin, Chilen yssl zone, txonomic diversity. MANSO, C.L.C. Ophiuroide (Echinodermt) de gus profunds del Pcifico Sur-Orientl. Biot Neotrop. 10 (2): /v10n2/pt/strct?inventory+n Resumen: Se nlizn los ofiuroídeos colectdos durnte l expedición ocenográfic PUCK (SONNE-156) en 2001, en el mrco del proyecto Intercciones entre l productividd y el miente lo lrgo de l pltform continentl chilen. Ocho muestrs con ofiuroídeos contenín un totl de 15 especies: Gorgonocephlide (2), Asteronychide (2), Ophiomyxide (1), Ophicnthide (2), Ophiuride (5), Amphiuride (1), y Ophiolepidide (2). Cutro especies fueron registrds por primer vez en Chile, i.e., Asteronyx loveni Müller & Troschel, Astrodi tenuispin Verrill, Ophiolimn irdi (Lymn), y tres son nuevs especies, i.e., Ophiur (Ophiuroglyph) rntzi sp. nov., Amphiophiur gllrdoi sp. nov., nd Stegophiur wilhelmi sp. nov. Plrs-clve: ofiuroideos, gus profunds, mrgen continentl de Chile, zon isl de Chile, diversidd txonómic. /v10n2/en/strct?inventory+n

2 186 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. Introduction Among the min studies deling with Chilen shelf nd yssl echinoderms we note those resulting from expeditions like the Chllenger (Lymn 1882), revised y Ludwig (1898, 1899); the Discovery (Mortensen 1936); the Lund University Chile Expedition (Mortensen 1952); the Mr-Chile Expeditions I nd II, the Chiloé I Expedition (Cstillo-Alrcón 1968) nd the Eltnin Expedition, which studied the reltionship etween the Antrctic nd the Estern South Pcific funs off Chile nd Peru (Tommsi 1976) nd Quirog & Sellnes (2009) studied the growth nd size-structure of the ophiuroid Stegophiur sp. on the continentl slope off centrl Chile. Other ppers out Chilen cost deling with shllower ofiuroids, like Jrmillo (1981) out the ophiuroids from Chiloé & Conos inlets nd Dhm (1999) compred of the shllow wter (< 550 m) ophiuroid fun of the Mgelln region nd the high-antrctic Weddell Se. In spite of these efforts more recent ppers out the ophiuroids of the shelf nd slope of Chilen wters re very scrce nd only 40 species re registered off Chilen mrgin. Here we report on Ophiuroide (Echinodermt) otined in the continentl mrgin nd thyl zone off Chile, etween 22 S nd 42 S ltitude, y the Chilen-Germn PUCK Expedition (SONNE 156, 2001). Mterils nd Methods The ophiuroids were collected off Chile with n Agssiz trwl with mouth width of 1.5 m nd 10 mm mesh during the PUCK-156 Expedition (2001) onord R/V Sonne in three res long Chilen cost t three sttions 7103, 7105 nd 7106 (800 1,775 m) off Antofgst (22 S), two sttions 7166 nd 7167 (1,424 2,225 m) off Concepción (36 S) nd three sttions 7174, 7177 nd 7178 (1, m) off Chiloé (42 S) (Tle 1). They were wshed in filtered sewter, fixed in 10% formlin with orx nd plced fter in 70% ethnol. A detiled description of the smpling procedure hs een presented y Arntz et l. (1999). The identifiction ws performed on dried specimens following (Pterson 1985), Stöhr (2005) nd O Hr & Stöhr (2006). The systemtics follows Smith et l. (1995). For the synonyms of the species see Pterson (1985). All specimens were mesured nd photogrphed. The disc dimeter (dd) ws mesured from the edge of inter-rdius cross the dorsl disc to the edge of the opposite rdius (distl edge of the rdil shields where present) ccording to Störh (2005), with Mitsutoyo cliper. In this work we descrie new species nd species found for the first time off the Chilen cost. For the species previously found off the Chilen mrgin nd collected gin during the PUCK Expedition (i.e., Gorgonocephlus chilensis (Philippi), Astrotom gssizii Lymn, Ophiomyx vivipr Studer, Ophiur (Ophiuroglyph) lymni Ljungmn, Amphioplus mgellnic (Mortensen), Ophiomusium iporicum Cstillo-Alárcon nd Ophiomusium lymni (Wyville Thomson) we presented their geogrphicl distriution. The specimens were deposited in the Ntionl Museum of the Federl University of the Rio de Jneiro (EqMN), nd the Federl University of the Sergipe (UFSITAB), Itin Cmpus, Brzil. For the txonomy of the fmily Ophiuride, Pterson s P = L, V formul ws dopted. This llows to descrie the numer of tentcle scles of the rms locted round the pores closer to the disc, where A.P.1 = the first rm pore, A.P.2 = the second rm pore, A.P.3 = the Tle 1. List of Ophiuroide on sttions nd depth (m) of the collection during the PUCK Expedition (SONNE-156) in 2001 to the Estern South Pcific mrgin off Chile. Sttion numer depth (m) 7103 (846) 7105 (1775) 7106 (1312) 7166 (1424) 7167 (2225) 7174 (1153) OPHIUROIDEA Gorgonocephlide Gorgonocephlus chilensis Astrotom gssizii Asteronychide Asteronyx loveni Astrodi tenuispin Ophiomyxide Ophiomyx vivipr Ophicnthide Ophicnth sp Ophiolimn irdi Ophiuride Ophiocten mitinum Ophiur (Ophiuroglyph) lymni Ophiur (Ophiuroglyph) rntzi sp. nov Stegophiur wilhelmi sp. nov Amphiophiur gllrdoi sp. nov Amphiuride Amphioplus mgellnic Ophiolepidide Ophiomusium iporicum Ophiomusium lymni (995) 7178 (507) /v10n2/en/strct?inventory+n

3 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile third rm pore, nd so on; L = the numer of tentcle scles which rise from the lterl rm plte or from the rdil portion of the pore furthest from the mid-line of the rm; nd V = those tentcle scles which rise from the ventrl rm plte on the rdil portion of the pore nerest the mid-line of the rm (Pterson 1985). Results Fifteen species of ophiuroids were identified; mong these, three species re proposed s new: Ophiur (Ophiuroglyph) rntzi sp. nov., Amphiophiur gllrdoi sp. nov., nd Stegophiur wilhelmi sp. nov., nd four re recorded for the first time in the Estern South Pcific region: Astrodi tenuispin (Verrill, 1884), Asteronyx loveni Müller & Troschel, 1842, Ophiolimn irdi (Lymn, 1883), nd Ophiocten mitinum Lymn, The richest sttion in species ws # 7178 (off Chiloé) t 507 m depth with seven species while the deeper sttions yielded only 1-2 species ech. The most undnt species were Ophiocten mitinum etween 1, 424 nd 2,225 m depth, followed y Ophiomusium lymni nd Amphiophiur gllrdoi sp. nov., etween 1,000 nd 1,424 m depth, while ll other species were scrce nd occurred s single or few individuls (Tle 2). All species occurred t rther nrrow depth rnges, usully t single sttion or within few hundred meters. 1. Systemtics Clss Ophiuroide Gry, 1840 Su clss Ophiuride Gry, 1840 Order Eurylid Lmrck, 1816 Fmily Gorgonocephlide Ljungmn, 1867 (emend. Mortensen, 1933) Gorgonocephlus chilensis (Philippi, 1858) (Figure 1-c). Mteril exmined: St. # 7178, 507 m, UFSITAB-95 (1 specimen). Distriution: South of the South Americ from the Atlntic cost (36 S Argentin) to the Pcific cost (36 49 S - Cnon of Bio-Bio on Chilen cost), nd the Jun Fernndez, Mlvins, Georgis del Sur, Kerguelen Islnds nd New Zelnd, Antrctic, Herd nd Co region (South Afric), with thymetric rnge m (Jrmillo 1981, Bernsconi & D Agostino 1977). Astrotom gssizii Lymn, 1875 (Figure 2, ) Mteril exmined: St. # 7178, 507 m, EqMN 3001(2 specimens); UFSITAB-94 (1 specimen). Distriution: Along the Chilen mrgin etween Chiloe (42 S) nd the Strit of Mgelln. On the South Atlntic to North (39 ) off Argentin Cost; Tierr del Fuego; Mlvins, Georgis del Sur nd Shg Rocks Islnds; Antrctic region (Tierr de Grhm, Ross Se, Hkon VII Se; Tierr Adeli, Rein Mrí, Mc Roertson y Endery). Bthymetric rnge 74-1,000 m (Bernsconi & D Agostino, 1977). Fmily ASTERONYCHIDAE Müller & Troschel, 1840 (Emend. Mortensen, 1933) Asteronyx loveni Müller & Troschel, 1842 (Figure 3-e) Mteril exmined: St. # 7106, 1,312 m, EqMN 3007 (1 specimen); St. # 7166, 1,424 m, UFSITAB-86 (1 specimen). Description: The disc is pentgonl, 14 to 27 mm in disc dimeter, nd covered with skin, in which some isolted smll /v10n2/en/strct?inventory+n Tle 2. Loction of the collecting sttions. Sttion Dte (2001) Ltitude (S) Longitude (W) Depth (m) April April April June April My My My pltes re oserved. The rdil shields re long, r-shped nd seprted, reching the centrl region of the disc. These rdil shields re ctully overlin y severl smll pltes. The ventrl inter-rdil surfce is lso covered with skin, in which some round nd dispersed scles re oserved. The ursl slits re smll, out one rm segment long, ordered distlly y n immense genitl plte nd proximlly y smll genitl scles. The jws nd orl re re covered with thick skin. The jws re elevted proximlly, with three or more lunt ppille t the tip nd three or four smll lterl ppille extending long ech side of the jws. Orl shields re smll, with nrrower proximl edge nd rounded distl edge. Adorl shields re lrger nd seprtes the orl shield from the first lterl rm plte. The rms re long, covered with skin, nd very coiled, without dorsl pltes. The ventrl pltes re lso covered with thick skin. The lterl rm pltes er spines on their ventrl prt. The first nd second segments er one spine; from the third pore onwrds numers increse up to seven spines in the middle of the rm. These spines dhere to n erect rticultion ridge with round fcet for ech spine. The rm spines re very smll nd hook-shped with severl teeth, the ventrl one little lrger thn the rest on proximl segments, until segment 28, where it ecomes extremely ig, reching the opposite lterl plte. This spine is clu-shped, mce-like, with slightly rugose ody nd with terminl multiple points. Towrds the distl end of the rm these igger spines ecome incresingly smller gin, until they re just little lrger thn the others. Distriution: As recorded y Pterson (1985), this species is widely distriuted. It hs not een recorded in the Arctic Ocen nd some prts of the Southern hemisphere. This is the first record for the Estern South Pcific region off Chile. Astrodi tenuispin (Verril, 1884) (Figure 4-d) Mteril exmined: St. # 7178, 507 m, EqMN 2998 (1 specimen). Description: The disc is slightly pentgonl, 17 mm in dimeter, covered with thin skin, in which smll round scles cn e oserved. The r-shped rdil shields rech the middle of the disc nd re seprted distlly y scles lrger thn those oserved in the interrdil res of the dorsl surfce. The ventrl surfce is covered y smll rounded scles, dispersed in the centrl prt nd joined nd concentrted towrds the edges of the disc. The ursl slits re short nd locted etween the first nd the second rm segment, ordered y smll nd rounded genitl scles, isolted on its proximl portion, nd y n ccumultion of scles t the distl edge. The orl shields re extremely smll or even sent. The only shield tht is distinct is the mdreporite, which is tringulr nd presents two hydropores on its distl prt. The dorl shields re long, proximlly contiguous, nd seprte completely the remining orl shields from the first

4 188 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. c Figure 2. Astrotom gssizii Lymn. ) orl view: RS- rdil shields; ) orl view: J- jw. Figure 1. Gorgonocephlus chilensis (Philippi). ) orl view; ) orl view: J- Jw; MP- mouth ppille; BS- ursl slit; nd c) orl view. RS- rdil shields. lterl rm plte. The jws re short nd joined proximlly. The teeth re tringulr, rrnged in one or two verticl rows. There re two or three ppille on the jw s pex, flnked y up to five or more lock-like contiguous orl ppille rrnged in up to two horizontl rows on ech side of the jw. The first orl tentcle pore opens ner the orl mouth ngle. Four of the rms re coiled. Arm pltes re covered y thick skin. The rms re four to five times s long s the dimeter of the disc nd lck dorsl pltes. The lterl rm pltes re lrge. The ventrl rm pltes re conceled y skin. There re no spines on the first rm segment. The second nd third segments hve one spine, nd from /v10n2/en/strct?inventory+n

5 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile c d e Figure 3. Asteronyx loveni Muller & Troschel. ) orl view: RS- rdil shields; ) orl view: J- jw. MP- mouth ppille; M- mdreporite; BS- ursl slit; ADS- dorl shield. c-e) rm: VAS- ventrl rm spine; AS- rm spine; LAP- lterl rm plte. the fourth to the eighth segments there re two spines. From the ninth segment on, there re three thick nd conicl spines with smll glssy teeth distlly. Distriution: Astrodi tenuispin hs een recorded from oth sides of the North Atlntic t depths of 2,452-3,659 m; in the est from the Rockll islnd to the Porcupine Se Bight, the By of Biscy nd off Portugl t depths of 1,560 to 3,548 m (Pterson 1985). Order Ophiurid Müller & Troschel, 1840 Suorder Ophiomyxin Fell, 1962 Fmily Ophiomyxide Ljungmn, 1867 Ophiomyx vivipr Studer, 1876 (Figure 5, ) Mteril exmined: St. # 7178, 507m, UFSTAB-142 (1 specimen). Biologicl oservtions: This is viviprous species. In rooding ophiuroids the eggs re dischrged into the urse /v10n2/en/strct?inventory+n nd remin there until they hve developed into juveniles (Hymn 1955). This specimen of 23.5 mm in disc dimeter hd young inside the urse. Distriution: Mrgin off Chile from Chiloé to the South until the Strit of Mgelln. Atlntic Ocen: mrgin off Argentin (Sn Jorge Gulf South to Tierr del Fuego, Burdwood, Mlvins, Kerguelen, Tristn d Cunh) nd South Afric with thymetric rnge of m (Bernsconi & D Agostino 1977, Jrmillo, 1981). Suorder Ophiurin Müller & Troschel, 1840 Fmily Ophicnthide sensu lto Perrier, 1891 Sufmily Ophicnthine Pterson et l., 1982 Ophicnth sp. (Figure 6, ) Mteril exmined: St. # 7178, 507 m, EqMN 3009 (1 specimen).

6 190 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. c d Figure 4. Astrodi tenuispin (Verril). ) orl view: RS- rdil shields; ) rm: S-spine, TP- tentcle pore; c) rm: S- spines; nd d) orl view: BS- ursl slit. Description: The disc is regulr, 8,5 mm in dimeter, with smll, short, thick stumps, ech ering crown of smll thorns. The rdil shields re hidden. The ventrl interrdil surfces re covered y smll scles nd scrse spines. The ursl slits re wide nd long. The orl shield re lmost tringulr. The dorl shields re lmost retngulr meeting in front of the orl shields. The jws re smll nd hve four to five thick nd thorny mouth ppille. The thick infrdentl ppille re covered y smll spines. There re five rms. The first nd second dorsl rm pltes re contiguous nd hve few grnules, the others with ell shpe re smll nd not contiguous. The ventrl pltes re lmost pentgonl nd re seprted y the lterl ones. The lterl pltes only meet y the ventrl side, with five to six thorny, opque nd cylindricl rm spines. There is one smll thorny nd pointed tentcle scle. Remrks: The present specie ws not identified ecuse we hd only one individul. Ophicnth sp. differs from the other Chilen species nd the other species from djcent res like Ophicnth vivipr Ljungmn, 1870, O. iquiquensis Cstillo Alrcón, 1968, O. cosmic Lymn, 1878, O. rose Lymn, 1878, O. sentos Lymn, 1878, O. mrsupilis Lymn, 1875, O. ntrtic Koehler, 1922, O. ingrt (Koehler, 1923) nd O. svgic Tommsi, 1976 y the following chrcters: from O. vivipr Ljungmn, y the numer of rms nd rm spines (6 to 8 rms nd 9 to 12 rm spins in O. vivipr), from O. iquiquensis, O. cosmic, O. rose y the numer of rm spines (7 in O. iquiquensis, 8 in O. cosmic nd 11 in O. rose), from O. mrsupilis y the numer of rm spines nd orl ppille (3 rm spines nd 11 orl ppille in O. mrsupilis), from O. ntrtic y the spines of the disc nd numer of rms (slender spines with 3 or 4 terminl spinelets nd 5 to 6 rms in O. ntrtic), from O. ingrt y the numer of rms nd rm spines ( 6 to 7 rms nd 7 to 8 rms spines in O. ingrt ) nd from O. svgic y the numer of rm spines (4 in O. svgic). Sufmily Ophiotomine Pterson, 1985 Ophiolimn irdi (Lymn, 1883) (Figure 7 - c) Mteri exmined: St. # 7105, 1,775 m, UFSITAB-141 (1 specimen). /v10n2/en/strct?inventory+n

7 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile Figure 5. Ophiomyx vivipr Studer. ) orl view, JU- juvenile; nd ) orl view: OP- orl plte; BS-ursl slit. Figure 6. Ophicnth sp. ) orl view; nd ) orl view. OS- orl shield; ADS- dorl shield; OP- orl ppille. Description: The disc is su-pentgonl, 8,5 mm in dimeter. On the much dmged dorsl surfce only the rdil shields, s well s, some smll scles covered y spines nd elongted grnules could e oserved. The rdil shields re longer thn wider nd covered with smll scles nd spines. The ventrl interrdil surfces re covered with smll scles nd spines, similr to those of the dorsl surfce. The orl shields re su tringulr. The dorl shields hve concve distl lterl edges nd er numerous grnules on their contiguous proximl ends. The dorl shields seprtes the orl shields from the first ventrl rm plte. The jws re longer thn wider, with one or two pointed infrdentl ppille. There re five to six orl ppille with the first two or three pointed. The following orl ppille re more rounded, except for the lrgest distl one, which is /v10n2/en/strct?inventory+n lmost tringulr with rounded edges. The rms with slightly nodl ppernce re prtilly roken. The dorsl rm pltes re su-tringulr. The ventrl pltes re lmost pentgonl with rounded distl edge. A lrge tentcle pore is rmed with lef shped scle. The lterl nd ventrl pltes, nd the tentcle scles re distinctly strited, cusing these structures to shine. There re six rm spines. Remrks: Ophiolimn ird hs gret resemlnce with O. ntrctic (Lymn, 1879) ccording to O`Hr & Stöhr (2006). The min difference etween these two species, is the elongted spines, which occur mong the low disc grnules in O. irdi ut never in O. ntrctic (O Hr & Stöhr 2006). The wide distriution of the Ophiolimn ntrctic, includes NE Indin Ocen, Jpn, the NW Pcific, New Cledonin, New

8 192 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. Figure 8. Ophiocten mitinum Lymn. ) orl view: RS- rdil shields; CPP- centrl primry plte; RPP- rdil primry plte; rm: S- spines; nd ) orl view: OS- orl shield; ADS- dorl shield. c Zelnd, s well s Antrctic nd Su-Antrctic res, in depths of 180 to 2,926 m. Distriution: Pterson (1985) suggested tht this species originted in Afric. It hs een found in thyl nd yssl depths on oth sides of the North Atlntic. With this record its distriution is extended to the estern South Pcific Ocen. Suorder Chilophiur Mtsumoto 1915 Fmily Ophiuride Lymn 1865 Figure 7. Ophiolimn irdi (Lymn). ) orl view : S- spine; RS-rdil shield; ) ventrl rm side: VAP- ventrl rm plte; TS- tentcle scle; nd c) orl view: OS- orl shield; J- jw. Ophiocten mitinum Lymn 1878 (Figure 8, ) Mteril exmined: St. # 7105, 1,775 m, EqMN 3003 (14 specimens); St. # 7166, 1,424 m, EqMN 3004 (11 specimens); St. # 7167, 2,225 m, EqMN 3002 (74 specimens); UFSITAB-92 (48 specimens). Description: The disc is round nd flt, covered y scles of vrious sizes mesuring from 3 to 15 mm dimeters. The centrl dorsl plte nd circle of primry pltes re seprted y smller scles. The rdil shields rnge from n ovl to su-tringulr shpe nd re seprted from ech other y series of scles. The rm coms re formed y seven to eight thin spines nd cn e oserved to either side of n rm se, elow the rdil shields. The ventrl interrdil surfce is covered y scles similr to /v10n2/en/strct?inventory+n

9 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile those on the dorsl surfce. The ursl slits re long. The orl shields re pentgonl, pointed, nd t their distl edge slightly convex. The dorl shields re rectngulr, slim nd contiguous, seprting the orl shield from the first ventrl rm plte. The jws re long nd thin. There is single conicl picl ppill nd four to five lterl su-rectngulr ppille on ech side of the jws. The second orl tentcle pore is situted outside the mouth slit, with one or two scles ttched on the first ventrl rm plte nd one to two on the dorl shield. The dorsl rm pltes nerest to the disc were wider thn longer. On the distl segments the dorsl pltes re s wide s long. At the distl edge of these pltes until the proximity of the fourth or fifth segments, smll nd thin spines cn e oserved. The first ventrl rm plte is trpezoid nd the following re new moon-shped nd not contiguous. The lterl rm pltes re short, wide nd with three pointed spines, the dorsl one lrgest. The tentcle pore is lrge with three smll scles up to the two or three segment, fter tht the proximl scle is trophied, leving only one scle long the rm like show the following formul: A.P.1 = L1, V2; A.P.2 = L1, V2; A.P.3 = L1, V1; A.P.4 = L1, V1-0; A.P.5 = L1, V0. Distriution: Smith Chnnel, Mgelln Strit, Begle Chnnel, round the Mlvins Islnds (44-52 S nd W) (Discovery Expedition); off the Buenos Aires Province nd South Georgi Islnds, Kerguelen, Prince Edwrd nd Crozet (Bernsconi & D Agostino, 1977). This study extends the distriution of O. mitinum to the Pcific Ocen etween 22 nd 36 S while enlrging its thymetric rnge from m, to 2,225 m. Ophiur (Ophiuroglyph) lymni Ljungmn 1871 (Figure 9, ) Mteril exmined: St. # 7105, 1,775 m, EqMN 3008 (1 specimen); UFSITAB-89 (1 specimen). Distriution: Chilen Islnds nd Strit of Mgelln; Atlntic Ocen from Tierr del fuego to Argentin (Buenos Aires province 37 ºS), South Georgi nd Mlvins Islnds.With thymetric rnge m (Bernsconi & D Agostino 1977). Ophiur (Ophiuroglyph) rntzi sp. nov.(figure 10 - e) Holotype: St. # 7103, 846 m, EqMN 3000, Prtype: UFSITAB-88(1 specimen), collected in the sme sttion tht holotype. Type loclity: Chilen mrgin, S nd W. Etymology: The nme honors Prof. Dr. Wolf Arntz, formerly with the Alfred Wegener Institute for Polr nd Mrine Reserch, Bremerhven, Germny, one of the orgnizers nd cruise-leders of this expedition. Dignosis: A pentgonl disk is covered y lrge nd smll scles of diverse shpes. The rdils shields re wider thn long, seprted y two lrge nd inflted scles proximlly nd y the first dorsl rm plte distlly. The rdil re is strongly elevted with irregulr scles, lmost ll of them lrge. The lterl rm pltes hve three smll, thick spines on the proximl end nd from the ninth rm segment the centrl spines re trnsformed into smll hook. Description of the holotype: The holotype hs pentgonl disc with 9.5 mm of dimeter, covered y lrge nd smll scles of diverse shpes. The rdil shields re wider thn long, seprted proximlly y two lrge inflted scles nd distlly y the first dorsl rm plte. The rdil re is strongly elevted with irregulr scles, lmost ll of them lrge. All primry pltes re rounded nd lrge. Between the primries nd the centrl dorsl plte there re dditionl smller scles. These smller scles extend to the inter-rdil re. The medin distl interrdil re of the disc is /v10n2/en/strct?inventory+n Figure 9. Ophiur (Ophiuroglyph) lymni Ljungmn. ) orl view: CPPcentrl primry plte; RPP- rdil primry plte; RS- rdil shields; nd ) orl view: OS- orl shield; ADS dorl shield; J- jw. formed y lrge nd inflted scles with emphsis on the most distl scle tht is semi-rectngulr nd extremely inflted. The ventrl interrdil surfce is covered y inflted scles, slightly smller thn those of the dorsl re. The ursl slit is ordered y smll pointed spines tht progressively ecome igger to form the rm com. The orl shields re long nd lrge, rounded nd nrrower in their proximl prt, with strongly concve lterl edges. The dorl shields re smll, nrrow, semi-rectngulr nd contiguous. The jws re slender, contiguous nd slightly elevted on their proximl ends with two pointed infrdentl ppille those re sitting on the dentl plte, followed y five to six orl ppille, the first nd the second ones nrrow. The following ppille re rounded nd the three lst ones re in the shpe of continuous locks. The second orl tentcle pore is ig, opening outside the mouth slit with four or five scles on ech side.

10 194 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. c d e Figure 10. Ophiur (Ophiuroglyph) rntzi sp. nov. ) Holotype, orl view: CPP- centrl primry plte; RS- rdil shields; ) prtype: CPP- centrl primry plte; RPP- rdil primry plte; c) rm: LAP- lterl rm plte; d) rm: LAP- lterl rm plte; AS- rm spine; e) orl view: BS- ursl slit; OS- orl shield; ADS dorl shield; J- jw. The first three or four ventrl rm pltes re wider thn long nd continuous. The following ones re roder thn long nd incresingly seprted distlly. Proximlly the lterl rm pltes re not in contct with ech other ventrlly, ut fter the third segment they re in contct. They hve three smll, thick spines on the proximl end nd from the ninth rm segment the centrl spines re trnsformed into smll hook. The ventrl rm pltes re wider thn long on the first proximl segments, strongly decresing in size distlly. The tentcle pores present on the first five rm segments of the smller specimen, nd on the first seven segments of the lrgest specimens, the following formul: A.P.1 = L6-4, V5-4; A.P.2 = L4, V3; A.P.3 = L3, V2; A.P.4 = L3, V2; A.P.5 = L3, V2; A.P.6 = L2, V1; A.P.7 = L2-1, V0. Vrition in the prtype: Hooks pper on the third rm segment in the specimen with 6.5 mm of disc dimeter. Remrks: Ophiur (Ophiuroglyph) rntzi sp. nov. is close to O. (O.) lymni Ljungmn 1871, O. (O.) clemens (Koehler 1904), Ophiur (O.) irrort irrort (Lymn 1878), nd Ophiur (O.) irrort concret (Koehler 1901), in shring the shpe of disc scles. The present new species differs from O. (O.) lymni y the shpe of the rm com ppille (lock-shped in O. (O.) lymni), the rdil shields nd disc pltes (shorter in O. (O.) lymni), nd the dorsl rm pltes (extremely elevted in O. (O.) lymni); from O. (O.) clemens y the shpe of the orl shield, the shpe of the rm com, nd the shpe of the orl ppille (lock-shped in O. (O.) clemens); from O. (O.) irrort irrort, y the height of the disc (lower in O. (O.) irrort irrort) nd the size of the orl disc scles (smller in O. (O.) irrort irrort); from Ophiur (Ophiuroglyph) polycnth Mortensen, 1933 y the high of the dorsl disc scles (lower in O. (O.) polycnth) nd y the numer of rm spines (nine in O. (O.) polycnth ). Finlly, O. (O.) rntzi sp. nov. differs from Ophiur (Ophiuroglyph) irrort concret (Koehler 1901), y the size nd disposition of the dorsl scles of the disc (lrger or smller in O. (O.) irrort concret), y the shpe nd size of the orl shields (pentgonl nd s rod s long in O. (O.) irrort concret ) nd y the disposition of the spines. Stegophiur wilhelmi sp. nov. (Figure 11-c) Holotype: St. # 7177, 995 m, EqMN 2999, Prtype: UFSITAB-96 (1 specimen), collected in the sme sttion tht holotype. Type loclity: Chilen mrgin, S nd W. Etymology: The nme honors Dr. Ottmr Wilhelm, one of the founders of Mrine Sciences t the University of Concepción. Dignose: The slightly pentgonl disc hs rounded orders nd is covered with irregulr, somewht grnulted nd inflted scles. The centrl plte is semi-pentgonl, slightly convex, with the sme size or lrger thn the primries. The lterl rm pltes re of the sme width s the dorsl ones, with ech plte with one to three or no spines. Description of the holotype: The slightly pentgonl disc with 21 mm of the dimeter hs rounded orders nd is covered with /v10n2/en/strct?inventory+n

11 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile Figure 11. Stegophiur wilhelmi sp. nov. ) orl view: CPP- centrl primry plte; RS- rdil shields; ) rm: SS- secundry spine; PS- primry spine; nd c) orl view: OS- orl shield; ADS- dorl shield; J- jw. /v10n2/en/strct?inventory+n c irregulr, somewht grnulted nd inflted scles. The centrl plte is semi-pentgonl, slightly convex, with the sme size or lrger thn the primries nd it is seprted from those y five smll irregulr scles. The primries re followed in the rdil re y lrger su-pentgonl scles, with rounded distl orders, positioned on the proximl zone etween the rdil shields of the sme pir. The rdil shields re longer thn wide, inflted, nd contiguous over their distl third. Ech pir of rdil shields is seprted from neighoring pirs y five scles rrnged in the following wy: one lrge proximl scle, two middle ones nd three distl scles. These distl scles form the disc edge. The ventrl interrdil surfce is covered with five to six lrge irregulr scles. The ursl slits re nrrow nd long ordered y flt, rectngulr nd continuous genitl scles tht extend to the dorsl surfce of the disc were they ecome nrrower nd pointed, forming the rm com. The jws re longer thn wide, formed y strong nd inflted pltes. The infrdentl ppille re pointed in numer of two on the pex of the jws, followed y three to two orl ppille with rounded orders on ech side of the jws. The first orl tentcle pore communictes with the orl slit nd is ordered y four to five ppille connected with the jws nd dorl shields. Also four ppille re plced on the first ventrl rm plte. The dorl shields re inflted, nrrow nd continuous, close to ech other, covering the proximl third of the orl shield nd touching the first ventrl rm plte nd lso the first lterl rm plte. The orl shields hve proximl re tht gives the shield n rrow-like spect, with the distl edge well rounded. The rest of the ventrl surfce is covered y five lrge scles. The rms were roken on the studied specimens. The dorsl rm pltes re strongly convex, wider thn long, on the proximl hlf of the rm s long s wide. The lterl rm pltes re of the sme width s the dorsl ones, with ech plte with one to three or no spines. On the first rm segment there my e one, two or three spines, which re very smll, contiguous nd thick; three to four on the second segment; five to six on the third; seven to fourteen on the fourth segment nd onwrds, vrying in size. From the fourth segment the uppermost spine nd the middle ones (primries) re pointed nd lrger thn the others (secondry). The ltter re positioned in rows etween the primry spines tht re connected to the lterl pltes. On the fourth rm segment of the lrgest specimen, row with up to seven secondry spines ove the upper primry ones cn e oserved. On the fifth segment up to two secondry spines ove the upper ones cn e oserved ove the superior primry. The ventrl pltes of the rms re wider thn long nd hexgonl on the first segments. There re tentcle pores long the entire rm with tentcle scles distriuted ccording to the following formul: A.P.1 = L6-4, V4; A.P.2 = L4, V3; A.P.3 = L4-3, V3-2; A.P.4 = L4-3, V1; A.P.5, 6, 7, 8, 9 = L3, V1; A. P.10 = L2, V0. Remrks: The smller specimen exmined hd disc dimeter of 15 mm. According to Djkonov (1954) the genus Stegophiur Mtsumoto, 1917 possesses few species, mostly in the North Pcific, in prticulr off Jpn. More recently species ws registered in Mrion islnd, suntrctic region (Brnch et l., 1993). Only few species re found in the North Atlntic nd lso four species elong to the fun of the former Soviet Union. This is the first time tht this genus is recorded in the Estern South Pcific. Stegophiur wilhelmi sp. nov. is very close to S. rchyctis (H.L. Clrk, 1911), Stegophiur elevt (Lymn, 1878), S. nodos (Lütken, 1854) nd S. stere (H.L. Clrk, 1908) in shring the shpe of the disc pltes. The present new species differs from S. rchyctis

12 196 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. y the size of the centrl plte (smller in S. rchyctis) nd y the shpe of the ventrl rm pltes (tetrhedrl in S. rchyctis). Stegophiur wilhelmi sp. nov. differs from Stegophiur elevt y the size of disc pltes (smller in S. elevt ). Stegophiur wilhelmi sp. nov. differs from S. nodos (Lütken 1854) y the position nd the shpe of the dorl shields (rounded nd with no indenttion, nd locted in front of the orl shields in S. nodos), nd y the numer of rchil spines (smller in S. nodos). Stegophiur wilhelmi sp. nov. differs from S. stere (H.L. Clrk 1908) y the shpe of the rm com (very nrrow nd pointed in S. stere), y the numer nd shpe of the rm spines (four to five pointed primry spines nd fifteen pointed secondry spines in S. stere). Stegophiur wilhelmi sp. nov. differs from S. stuwitzii (Lütken 1857) y the size of the rdil shields (very nrrow nd short in S. stuwitzii), y the numer of orl ppille (pproximtely seven in S. stuwitzii), y the disposition of the rm spines (completely seprted, not forming series in S. stuwitzii), nd finlly, y the presence of crest on the first ten ventrl rm pltes in S. stuwitzii. Stegophiur wilhelmi sp. nov. differs from S. sldeni (Duncn 1879) y the shpe nd numer of the ppille on the rm com (pointed nd numerous (13) primry spines in S. sldeni), nd lso, y the ventrl rm pltes (with n elevtion in S. sldeni). Stegophiur wilhelmi sp. nov., differs from S. crint Djkonov, 1954 y the ltter s dorsl surfce of the disc (covered with scles smller nd more numerous in S. crint) y the primry scles (smll in S. crint), y the rm com (formed y nrrow nd long ppille in S. crint), y the dorsl rm plte of the mid-distl re (short nd wide excvted in S. crint), nd y the proximl ventrl rm pltes (with medin elevtion S. crint). Stegophiur wilhelmi sp. nov. differs from S. mcrrthr H. L. Clrk, 1915 y the shpe of dorsl disc pltes (lrger in S. mcrrthr), y the numer of primry spines (3 to 4 primry spines nd crest on the middle region of the proximl ventrl rm plte in S. mcrrthr). Stegophiur wilhelmi sp. nov. differs from S. vivipr Mtsumoto, 1915 y the rrngement nd numer of the dorsl interrdil pltes (lrge squre plte seprting the pir of rdil shields nd the pirs next to it in S. vivipr) nd y the numer of orl ppille (5 in S. vivipr ). Amphiophiur gllrdoi sp. nov. (Figure 12-c) Holotype: St. # 7166, 1,424 m, EqMN 2995, Prtypes: EqMN 2996 (9 specimens) nd UFSITAB-84 (7 specimens), collected in the sme sttion tht holotype. Type loclity: Chilen mrgin, S nd W. Etymology: The nme honors Prof. Dr. Víctor Ariel Gllrdo, of the Deprtment of Ocenogrphy of the University of Concepción, one of the min orgnizers nd cruise-leders of the PUCK expedition. All of them with disc dimeters etween 6 nd 13.5 mm. Dignosis: The disc is pentgonl nd covered y lrge, tumid scles mixed with very smll ones. The primry pltes re well defined. Between the centrl primry plte nd the rdil primries, numerous smll scles cn e oserved; some resemling just smll grins. Description of the holotype: The disc is pentgonl nd covered y lrge, tumid scles mixed with very smll ones. Disc with 11 mm of the dimeter. The primry pltes re well defined. Between the centrl primry plte nd the rdil primries, numerous smll scles cn e oserved; some resemling just smll grins. The rdil shields re smll nd longer thn wide, seprted y three to five lrge scles of vrying size nd shpe, the middle one eing lrger thn the others. The lrger scles re lmost lwys tumid. The interrdil dorsl surfce re contins two lrge scles, extremely well defined nd surrounded y smll scles of diverse shpe. The ventrl re is Figure 12. Amphiophiur gllrdoi sp. nov. ) Holotype, dorl view: CPP- centrl primry plte; RS- rdil shields; ) orl view: OS- orl shield; ADS dorl shield; J- jw; nd c) Prtype, orl view: CPP- centrl primry plte. covered y scles, similr to those of the dorsl surfce, except tht these re smller. The ursl slits extend from the orl shields to the dorsl surfce of the disc. The genitl scles re long, with series of smll, qudrngulr to rounded scles rrnged continuously /v10n2/en/strct?inventory+n c

13 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile distlwrds forming the rm com. The orl shields re lrge nd su-pentgonl with slight lterl indenttion nd with nrrow proximl edge. The djcent dorl shields re nrrow. The jws re short nd slightly elevted in their proximl prt. The teeth re lrge nd pointed. There re one or two pointed infrdentl ppille, nd four to six orl ppille with the proximl ones slightly nrrower. The remining ppille re semi-rectngulr, ll locted in the middle of the proximl portion of the jws, rnging from very smll to very ig ones. The second orl tentcle pore is lrge nd close to the orl slit. Seven scles re ttched to the distl prt of the jws, nd the proximl prt of the dorl shields; nd four to five scles re ssocited with the first ventrl rm pltes. The rms of the holotype re roken. The first four dorsl rm pltes re rectngulr nd tumid; following ones rnge from su-tringulr to tringulr, decresing in size long the rm. The lterl rm pltes re lrge, nd from the fourth to the seventh segments they re contiguous on the ventrl re with five to seven short nd thick rm spines. The first ventrl rm plte is hexgonl, the following ones ecome pentgonl. The tentcle scles re distriuted in the following wy: A.P.1 = L5, V5; A.P.2 = L5, V5; A.P.3 = L5, V5; A.P.4 = L4, V3-4; A.P.5 = L4, V3; A.P.6 = L3, V2; A.P.7 = L3, V1; A.P.8 = L3, V1; A.P.11 = L2, V1; A.P.17 = L0, V0. Vritions in the Prtypes: Differences mong the scles of the dorsl surfce of the disc relte minly to their form, size, height nd position. These vritions were found in prcticlly ll specimens ut llowed to recognize two sic groups: (1) first group composed of specimens where smll, slightly high scles predominte, nd (2) second group with lrger nd high scles. All the specimens presented some differences. Remrks: Amphiophiur gllrdoi sp. nov. is close to A. ullt ullt (Wyville-Thompson, 1877), A. ullt convex (Lymn, 1878), A. ullt vitjzi Litvinov, 1971, A. metul H. L. Clrk, 1915, A. surur (Verrill, 1894), nd A. sculptilis (Lymn, 1878) in shring pltes with vrying sizes on the dorsl surfce of the disc. Amphiophiur gllrdoi sp. nov. differs from A. ullt ullt, A. ullt convex, A. ullt vitjzi, A. metul, A. surur, nd A. sculptilis, y the size nd shpe of the rdil shields (igger in A. ullt ullt, A. ullt convex nd A. ullt vitjz; rectngulr to terdrop shped in A. metul nd A. surur; rectngulr in A. sculptilis). Amphiophiur gllrdoi sp. nov. differs from Amphiophiur pucisqumt Ziesenhenne, 1940, y the size nd numer of dorsl scles (few lrge nd pitted dorsl disc pltes in A. pucisqumt) nd in the smll numer of rm spines (2 or 3 A. pucisqumt). Amphiophiur gllrdoi sp. nov. differs from Amphiophiur irregulris Ziesenhenne, 1940, y the size of the rdil shields (lrge, slightly longer thn wide, nd rodly in contct in A. irregulris) nd y the ll the pltes re finely grnulr in A. irregulris. Amphiophiur gllrdoi sp. nov. differs from Amphiophiur oediplx (H.L. Clrk, 1911) y the shpe of rdil shields (lmost squre in A. oediplx) nd y the numer of tentcles scles (two or three, nd only one towrd the rm tips in A. oediplx). Amphiophiur gllrdoi sp. nov. differs from A. penichr (H.L. Clrk, 1911) y the numer of rm spines (one very ppilliform in A. penichr). Amphiophiur gllrdoi sp. nov. differs from A. pchyplx Djkonov, 1954 y the orl shields (wide distlly in A. pchyplx) nd y the numer of rm spines (only one in A. pchyplx). Amphiophiur gllrdoi sp. nov. differs from A. ponderos (Lymn, 1878) y the plte pttern of the ventrl side of the disc (interrdilly covered with four lrge pltes in A. ponderos). Amphiophiur gllrdoi sp. nov. differs from /v10n2/en/strct?inventory+n A. megpom (H.L. Clrk, 1911) y the numer of rm spines (4 to 5 in A. megpom), y the smller numer of the orl ppille (3 smll nd otuse ppille in A. megpom) nd y the lck of scles on the inner side of the tentcle pores, even on the proximl joints in A. megpom. Amphiophiur gllrdoi sp. nov. differs from A. gios Mortensen, 1936 y the dorl pltes of the disc (igger in A. gios), nd y the numer of the orl ppille (three in A. gios). Amphiophiur gllrdoi sp. nov. differs from A. rowetti Smith, 1923, y size of dorl scles of the disk (igger in A. rowetti). Suorder Gntophiurin Mtsumoto, 1915 Super fmily Gnthophiuride Mtsumoto, 1915 Fmily Amphiuride Ljungmn, 1867 Amphioplus mgellnic (Mortensen, 1936) (Figure 13, ). Mteril exmined: St. # 7105, 1,775 m, UFSITAB-87 (1 specimen). Figure 13. Amphioplus mgellnic (Mortensen). ) orl view: RS- rdil shields. nd ) orl view.

14 198 Biot Neotrop., vol. 10, no. 2 Mnso, C.L.C. Distriution: Chilen Mrgin (31 to 39 S) with thymetric distriution round 300 m. Suorder Ophiolepidin Ljungmn, 1867 Fmily Ophiolepidide Ljungmn, 1867 Ophiomusium iporicum Cstillo-Alárcon, 1968 (Figure 14, ) Mteril exmined: St. # 7178, 507 m, EqMN 2994 (3 specimens); UFSITAB-85 (2 specimens) Distriution: Chilen mrgin (20 15 S nd 70 18` W), thymetric distriution round 582 m. Ophiomusium lymni Wyville-Thomson, 1873 (Figure 15, ) Mteril exmined: St. # 7106, 1,312 m, EqMN 3006 (8 specimens); St. # 7174, 1,153 m, EqMN 3005 (6 specimens), UFSITAB-91 (4 specimens); St. # 7177, 995 m, EqMN 2997 (1 specimen). Distriution: This species is found in the Pcific, Indin nd Atlntic Ocens, with thymetric rnge of 651-4,829 m. Discussion Cstillo-Alrcón (1968), with se on the ophiuroid fun, divided the Chilen mrgin into three iogeogrphicl zones: 1) from the extreme northern Chile to Tlchuno (i.e., centrl Chile), including the Jun Fernández Archipelgo (20 S to 36 S) occupied y wrm-temperte wter species; 2) etween Tlchuno nd Vldivi (36 S to 39 S), (i.e., centrl-south Chile). trnsition zone with cold-temperte nd wrm-temperte wter species; 3) from Vldivi (centrl-south Chile) to the South, end of Chile with coldtemperte species. The species collected y Expedition PUCK cn e distriuted s follows: 1) First zone: Asteronyx loveni, Ophiolimn irdi, Ophiocten mitinum, Ophiur (Ophiuroglyph) rntzi sp. nov., Amphioplus mgellnic nd Ophiomusium lymni; 2) Trnsition zone: Asteronyx loveni, Ophiocten mitinum nd Amphiophiur gllrdoi sp. nov; 3) Third zone: Gorgonocephlus chilensis, Astrotom gssizii, Astrodi tenuispin, Ophiomyx vivipr, Ophicnth sp. Stegophiur wilhelmi sp. nov., Ophiur (Ophiuroglyph) lymni, Ophiomusium iporicum, nd Ophiomusium lymni. Figure 14. Ophiomusium iporicum Cstillo-Alárcon. ) dorl view: RS- rdil shields; nd ) orl view: OS- orl shield; ADS dorl shield; J- jw. Figure 15. Ophiomusium lymni Wyville-Thomson. ) vist orl: RS- rdil shields. nd ) orl view: OS- orl shield; ADS dorl shield; J- jw. /v10n2/en/strct?inventory+n

15 Biot Neotrop., vol. 10, no Deep-wter Ophiuroide off Chile Some uthors hve tried to understnd the circumpolr distriution of some echinoderm species nd the funl reltionship etween the su-antrctic islnds, Southern South Americ, Southern Afric, New Zelnd nd the Antrctic regions sed on possile sumrine topogrphic connection tht could hve een ville etween the end of the Cretceous or the eginning of the Tertiry (Jrmillo, 1981). Fell (1962) suggested tht one of the topogrphic connections for the echinoderm fun from the Southern Hemisphere (Antrctic nd su-antrctic regions) could hve een provided y string of islnds seprted y nrrow chnnels, uniting the Antrctic, Chile, Argentin, Mlvins Islnds, the Scoti Arch nd the western Antrctic rchipelgos. According to Jrmillo (1981), these topogrphic links could explin the cler funl reltionships etween the rchipelgos of the Chiloé nd the Los Chonos islnds (Southern Chile) with southern Argentin, Mlvins Is., the South Georgi s nd the Antrctic. Acknowledgements I m grteful to Dr. Sine Stöhr of the Stockholm Museum of Nturl History, for her kind help with literture nd vlule indictions on the identifiction of some species, mnuscript revision nd vlule suggestions. I would like to thnk Dr Vítor A. Gllrdo director of the Center of Ocenogrphic Investigtion on the Ester South Pcific t Mrine Biology Sttion of the Concepción University, Chile, for fcilities in Chile, nd the vlule suggestions for the mnuscript. Thnks to Dr. Edurdo Quirog, from the Center for Reserch in Ptgonin Ecosystems (CIEP), Coyhique, Chile, for the collection nd sorting of the mteril, nd Dr. Dirk Heeln, of Geomr, Bremen University, Bremen, Germny, Chief Scientist of the PUCK Expedition. This is contriution of the CONICYT-Chile, FONDAP-Humoldt nd FONDAP-COPAS grnts to the University of Concepción, Chile. References ARNTZ, W.E., GORNY, M., SOTO, R., LARDIES, M.A., RETAMAL, M.A. & WEHRTMANN, I.S Species composition nd distriution of decpod crustcens in the wters off Ptgoni nd Tierr del Fuego, South Americ. Sci. Mr. 63(1): BERNASCONI, I. & D AGOSTINO, M.M Ofiuroídeos del mr epicontinentl rgentino. Rev. Mus. Arg. Cs. Nt. Hidroiologi 5(5): BRANCH, M.L., JANGOUX, M., ALVÁ, V., MASSIN, C.I. & SAMPANATO, S The Echinodermt of suntrctic Mrion nd Price Edwrds Islnds. S. Afr. J.Antrct. Res. 23(1): CASTILLO-ALÁCON, J.G Contriución l conocimiento de los ofiuroídeos chilenos. Gyn Zool. 14:3-63. DAHM, C Ophiuroids (Echinodermt) of southern Chile nd the Antrctic: Txonomy, iomss, diet nd growth of dominnt species. In Mgelln-Antrctic: Ecosystems Tht drifted prt (W.E. Arntz & C. Ríos, eds.). Sci. Mr. 63(Supl. 1): DJAKONOV, A.M Ophiuroids of the USSR. Moscow, 136p. (Trnslted from Russin y Isrel Progrm for Scientific Trnsltions, Jeruslem, 1967, 123p.) FELL, H.B A revision of the mjor gener of mphiurid Ophiuroide. Trns. Roy. Soc. N. Z. Zool. 2:1-26. JARAMILLO, E Ofiuroídeos de los rchipiélgos de Chiloé y los Chonos. S. Neotr. F. Env. 16: LUDWIG, H Die Ophiuren der Smmlung Plte. Zool. Jhr. Suppl. 4: LUDWIG, H Ophiuroideen. (Ergenisse der Hmurger Mglhensischen Smmelreise I Bnd). LYMAN, T Ophiuride nd Astrophytide of the H.M.S. Chllenger Expedition. Prt I. Bull. Mus. comp. Zool. Hrv. 5(7): LYMAN, T Report on the Ophiuroide dredged y H. M. S. Chllenger, during the yers Rep. scient. Res. Voy. Chllenger. Zool. 5: MORTENSEN, T Echinoide nd Ophiuroide. Discovery Rep. 12: MORTENSEN, T Echinoide nd Ophiuroide. Report of the Lund University Chile Expedition Act Univ. Lund. N. F. 47(8):1 22. O HARA, T.D. & STÖHR, S Deep wter Ophiuroide (Echinodermt) of New Cledoni: Ophicnthide nd Hemieurylide. Tropicl Deep Se Benthos. Memoir. Mus. Ntl Hist. 193(24): PATERSON, G.L.J The deep-se Ophiuroide of the North Atlntic Ocen. Bull. Br. Mus. (nt. Hist.) Zool. 49(1): QUIROGA, E. & SELLANES, J Growth nd size-structure of Stegophiur sp. (Echinodermt: Ophiuroide) on the continentl slope off centrl Chile: comprison etween cold seep nd non-seep sites. J. Mr. Biol. Ass. U.K. 89(2): SMITH, A.B., PATERSON, G.L.J. & LAFAY, B Ophiuroid phylogeny nd higher txonomy: Morphologicl, moleculr nd pleontologicl perspectives. Zool. J. Linn. Soc. 114(2): STÖHR, S Who s who mong y rittle strs (Echinodermt: Ophiuroide): postmetmorphic development of some North Atlntic forms. Zool. J. Linn. Soc. 143(4): TOMMASI, L.R Ophiuroide collected the Peru-Chile trench y the USNS ELTANIN during Cruise III. Pp. Avulsos Zool. 29(28): Received 21/11/09 Revised 31/03/10 Accepted 15/04/10 /v10n2/en/strct?inventory+n