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TWO NEW SPECIES OF PLANODISCUS (ACARI : UROPODINA), RANGE EXTENSIONS AND A SYNONOMY WITHIN THE GENUS 1 BY Richard J. ELZINGA 2 PLANODISCUS N. SPP. SYNONYM DISTRIBUTION ARMY ANTS PLANODISCUS N. SPP. SYNONYM VERBREITUNG W ANDERAMEISEN PLANODISCUS N. SPP. SYNONYME DISTRIBUTION FOURMIS ABSTRACT : Two new species of Planodiscus from neotropical army ants are described. The geographic ranges of other species of this genus are significantly extended. P. elzingai is a synonym of P. squamatim. ZUSAMMENFASSUNG : Zwei neue Planodiscus-arten von neotropischen Wanderameisen werden beschrieben. Die Verbreitungsgebiete anderer Arten derselben Gattung werden wesentlich erweitert. P. elzingai erweist sich ais Synonym für P. squamatim. RÉSUMÉ : Deux espèces nouvelles de Planodiscus des fourmis amazones néotropicales sont décrites. Les répartitions géographiques des autres espèces de ce genre sont significativement augmentées. P. elzingai est synonyme de P. squamatim. Planodiscus squamatim was described by SELLNICK (1926) based on specimens from the army ant, Eciton quadriglume (Haliday), with the type locality being Rio Negro, Parana. The genus was synomyzed into Trichocylliba by HIRSCHMANN and ZIRNGIEBL-NICOL (1964), however, ELZINGA and RETTENMEYER (1966) and ELZINGA (1981) reaffirmed the status of Planodiscus as a genus. ELZINGA and RETTENMEYER (1966, 1970) redescribed P. squamatim when designating a neotype for the species and described six new species, P. setosus and P. cupiens from British Guiana, P. elongatus and P. hamatus from Panama, P. foreli from Panama and Mexico, and P. burchelli from Costa Rica, Panama, British Guiana, and Trinidad. HrRSCHMANN (1973) designated the previously mentioned neotype of P. squamatim as a new species, P. elzingai, based, apparently, on the published description of the neotype. Specimens have been received from collectors which have permitted a more extensive review of the species in this genus and the variations that appear within local populations (the summary of these new geographic collecting records follows the new species descriptions). The variations are within the boundaries of the published descriptions except for P. elzingai which should now be considered as a synonym of P. squamatim. The discovered para- 1. Contribution No. 89-981 from the Kansas Agricultural Experiment Station, Manhattan, Kansas 66506. Supported by Experiment Station Project H033. 2. Kansas State University, Department of Entomology, Manhattan, Kansas 66506, USA. Acaro/ogia, t. XXXI, fasc. 3, 1990.
types of P. squamatim cited in HIRSCHMANN's (1973) designation of P. elzingai have been viewed by me and when coupled with the description of the neotype and other specimens viewed when the neotype was designated indicate the existence of a single species. Two new species of Planodiscus will be described subsequently in this publication. P. borgmeieri, the only species in this genus known from a Labidus army ant carrier, can easily be separated from the other elongate species, P. elongatus, by the presence of only weak punctation, the more than 40 pairs of large dorsal setae, and the media! striate ridges on the anterior dorsal prolongation (Fig. 5). The second new species, P. mexicanus, is similar to P. foreli and to P. squamatim but can be recognized from the former species by its larger size (more than 1,100 µm in length) and by having less than 40 pairs of large dorsal setae and from the latter species by the shorter female genital plate and by the tips of the dorsal setae having one of the bifurcate points greatly reduced ans displaced from the tip of the seta (Fig. 1 ). Planodiscus mexicanus n. sp. Body approximately twice as long as broad ; punctation on dorsum and venter strong and relatively uniform. Female Body large, 1, 150-1,400 µm long ; other measurements in Table 1. Dorsum (Fig.!) : with 39 pairs of large setae, evenly dispersed, flattened, apically notched with points unequal except 5-6 pairs of longer usually unnotched elongate setae near posterior margin. Anterior prolongation moderate in size, membranous margin present ; 3-4 pairs of large and 3 pairs of small setae on anterior prolongation (excluding small marginal setae). lst pair of large setae slightly shorter and about as thick as 2nd pair; no anteromedial unpaired setae on prolongation. 40 pairs of small setae in marginal row and 23 pairs in submarginal row. 10 pairs of elongated pores. - 230-2 posterior rows of fringed, mushroom-shaped setae, anterior row of 4 in posterior margin of dorsal shield and posterior row of 8 setae behind margm. Venter (Fig. 2) : sternoventral plate moderately concave between legs II-IV, with pronounced indentations in region of coxae III. 4 pairs of setae on sternoventral plate between coxae I-II, lst pair near or contiguous to anterior pores, each of other 3 pairs of setae near coxae II-IV, 4th pair not on lateral lobe, equidistant between genital plate and tip of lobe. Genital plate about 3/4 as wide as long, punctation absent or present as very weak configurations in posterior 1/3 of plate. Metapodal plates with carinae cutting diagonally from near anteromedial corner to near middle of posterolateral margin of each plate, punctation distinct and similar to that on posterolateral area of sternoventral plate. Sternoventral plate posterior to coxae IV with 3 pairs of setae, lst and 2nd pairs anterior to widest point and close to margin, lst pair twice distance from margin as 2nd, 3rd pair posterior to widest point and usually not reaching anus. A pair of elongate pores (may be absent) usually near lst pair of setae. Distance from widest part of sternoventral plate to coxae IV much greater than distance to anus. Lateral plates somewhat wider in posterior half than in anterior, each bearing 3 setae and 3 elongated pores, length of setae about 1/2-3/4 width of lateral plates at widest point. Legs : posteroventral setae of coxae I lacking barbs; chaetotaxy of legs II-IV similar. Gnathosoma : distal hypostomal setae with 2 barbs, 2nd pair 1/2 length of lst pair and with single barb, 3rd pair same length as lst pair and with 11 barbs. Gnathosomal setae same length as 1 st hypostomal, with 5-6 barbs. Male Body similar to female but slightly smaller, 1, 100-1,350 µm ; other measurements in Table 1. Eight pairs of sternoventral setae ; 4th pair of sternoventral setae anterior to middle of lateral lobe between coxae III and IV; flange of genital plate usually covering 5th pair of sternal setae.
- 231-2 F1Gs. 1-4 : Planodiscus, spp. 1. - P. mexicanus n. sp., female, dorsum. 2. - Idem, venter. 3. - P. borgmeieri n. sp., female, dorsum. 4. - Idem, venter.
- 232- TABLE 1. - Measurements (in microns) of new Planodiscus. No. Specimens Measured Measurements Range P. mexicanus (6 <;?, 2 d') P. borgmeieri (2 <;?) <;? d' Range <;? Body length 1,150-1,400 1,298-1,315 1,150-1,208 Length sternoventral plate 825-885 Posterior edge genital plate to posterior edge of sternoventral 541-591 Width sternoventral plate between legs III IV 264-285 Width of sternoventral plate between legs IV and anus 295-313 Length of genital plate including!lange in male 173-179 Width of genital plate including!lange in male 129-155 Length of laierai plate Width of laierai plate 461-496 75-90 810-831 509-510 256-273 263-270 68-75 83-88 431-440 75-76 850-893 595-670 i49-i78 149-178 141-160 97-120 562-640 47-52 Types Holotype female with the following data : MEXICO : Upper Coatzacoalcos River, Modelo Oax., 23.iv.45, T. C. ScHNEIRLA, Eciton hamatum, Colony N; Slide No. RE-122. Allotype male with same data except Slide No. RE-121. Holotype female and Allotype male are deposited in the U. S. National Museum (USNM). Paratypes from the same locality and host species are deposited in British Museum (Natural History) (1 ~) and author's collection (19 ~. 12 c3'). Locality and Hosts This species is known only from the type locality and host. Planodiscus borgmeieri n. sp. Body approximately 4.5 to 5 times as long as broad ; punctation on dorsum and venter weak to moderate, those on dorsal prolongation elongate longitudinally (Fig. 5). Fe male Body elongate, 1,150-1,210 µm long; other measurements in Table I. Agrees with description of P. mexicanus except as follows : Dorsum (Fig. 3) : with 2 unpaired and 40-50 paired large setae, somewhat more distributed posteriorly, unnotched apically. Anterior prolongation with dorsal striations (Fig. 5) and with 2 pairs large, 3 pairs small, and 2 widely separated unpaired setae. 30-36 pairs of small marginal setae, becoming more elongate in posterior half of dorsum. 20 pairs of small submarginal setae. Venter (Fig. 4) : sternoventral plate elongate 4th pair of sternoventral setae on lateral lobe of sternoventral plate opposite leg IV. Genital plate elongate, about 2/3s wide as long. Metapodal plates with carinae along posterior margins. Region of sternoventral plate posterior to widest point also elongate, possessing ail ventral setae, 3rd pair reaching anus. Lateral plate elongate, setae 3 or 4 in number on each plate. Legs : posteroventral setae of coxae I lacking barbs and short. Gnathosoma : distal hypostomal setae unbarbed, 2nd pair with 1 barb, 3rd pair with 6 barbs; gnathosomal setae lacking barbs. Male. Unknown. Types Holotype female with the following data; ECUA DOR : Oriente, 00 24' S, 76 36' W, Limoncocha,
- 233 15.XI.1967, c. W. & M. E. RETTENMEYER, Host : Neivamyrmex gradualis, Colony E-530. Holotype has been deposited in USNM. The species name is to honor the famed myrmecologist, T. BORGMEIER. as host (D. H. & A. C. KISTNER) and Madre de Dios, Peru with Eciton sp. as host (D. H. K1sT NER). P. e/ongatus has now been collected from outside Panama with collections from Chiapas, Mexico with E. mexicanum and E. vagans as host (SCHNEIRLA), Tikal, Guatemala with E. hamatum as host (A. C. & D. C. KISTNER), Limancocha, Ecuador with E. rapax as host (C. W. & M. E. RETTENMEYER), and Rio Palenque, Ecuador with E. hamatum as a carrier (D. H. & A. C. KISTNER). P. setosus is now known from Altamira-Maraba, Para, Brazil with E. burchelli as the carrier (N. DEGALLIER). ACKNOWLEDGMENTS Dr. David H. KISTNER (Calif. St. Univ., Chico) and Dr. Carl W. RETTENMEYER (Univ. Conn.) supplied specimens used in the study. 1 thank Dr. E. HORBER (Kans. St. Univ.) for the German abstract and John KRCHMA (Kans. St. Univ.) for scanning electron microscope services. FIG. 5 : Planodiscus borgmeieri n. sp., anterior dorsal prolon gation. Localities and Hosts In addition to the holotype, single specimen has been collected by F. PLAUMANN in BRAZIL: Nova Teutonio, 27 23' S, 52 23' W, n.1959 on Neivamyrmex legionis. RANGE EXTENSIONS The following localities represent significant range extensions for the listed Planodiscus species (collectors are in parentheses). P. burchelli is now known from as far north as Tikal, Guatemala with Eciton burchelli as a carrier host (D. H. & A. C. KisTNER) and as far south as Altamira Maraba Brazil (N. DEGALLIER). P. fore!i distribution is extended southward to Rio Palenque, Ecuador with E. hamatum as host (D. H. & A. C. KISTNER). P. hamatus is now known from outside Costa Rica and Panama with collections from Tikal, Guatemala and E. hamatum REFERENCES ELZINGA (R. J.), 1981. - The generic status and six new species of Trichocylliba (Acari: Uropodina). - Acaro Jogia 23 (1) : 3-18. ELZINGA (R. J.) & RETTENMEYER (C. W.), 1966. - A neotype and new species of Planodiscus (Acarina : Uropodina) found on doryline ants. - Acarologia 8 (2) : 191-199. ELZINGA (R. J.) & RETTENMEYER (C. W.), 1970. - Five new species of Planodiscus (Acarina : Uropodina) found on doryline ants. - Acarologia 12 (1) : 59-70. HIRSCHMANN (W.), 1973. - Gangsystematik der Parasitiformes : Adulten-Bestimmungstabelle von 19 Trichocylliba-Arten und Operculum-bestimmungstabelle von 18 Trichocylliba-Weibchen (Dinychini : Uropodinae). - Acarologie 26 : 124-127. HlRSCHMANN (W.) & ZIRNGIEBL-NICOL (1.), 1964. - Uropodiden : Das Gangsystem der Uropodidae (Berlese 1892), Bestimmungstabellen, Kurzdiagnosen, Operculumbestimmungstabellen. - Acarologie 6 : 1-22. SELLNICK (M.), 1926. - Alguns novas acaros (Uropodidae) myrmecophilos e terrnitophilos. - Arch. Mus. Rio de Janeiro 26 : 29-56. Paru en Décembre 1990.