Phylum Mollusca (mollis, soft)
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1 Phylum Mollusca
2 Phylum Mollusca (mollis, soft) Body usually an anterior head, ventral foot and a dorsal visceral mass. Covered by a fleshy outgrowth of the body wall called a mantle. Shell if present is secreted by the mantle Radula- a tongue-like structure bearing transvers rows of minute chitinous teeth. Good phylum for demonstrating Adaptative Radiation. With the exception of Monoplacophora, the phylum is unsegmented.
3 Systems Skeletal- Mantle may secretes a shell. Use hydrostatic pressure for ventral muscular foot. Muscles -Ventral muscular foot and other muscles present. Digestive- complete complex with salivary glands, digestive gland and Rasping tongue (Radula). Circulatory - Open except for Cephalopoda. Dorsal heart, usually in a pericardial cavity. Respiratory - Ctenidia (gills) in mantle cavity, respiratory pigment is copper.
4 Systems Excretory- by nephridia usually connecting to the pericardial cavity, the coelom is usually reduced to the cavities of the nephridia, gonads and pericardium. Nervous - Nerve ring with various pairs of ganglia two pairs of nerve cords, one innervating the foot, the other the visceral mass (modified ventral ladder-like system) Integumentary - Mantle Endocrine - nervous systems produces hormones. Reproductive - varied- monoecious, protandric, or dioecious. Larva in marine = trochophore and veliger, in freshwater clam is glochidium.
5 Taxonomy Classes: Monoplacophora (no specimens) Polyplacophora Scaphopoda Gastropoda Bivalvia Cephalopoda Mouse click on any underlined taxon to go to information of that taxon
6 Back to Taxonomy Class Polyplacophora (Chitons) Elliptical body with dorsal surface bearing eight overlapping limy plates (valves) Chitons are marine. They live mostly in shallow water. All are similar in morphology and ecology. They are slow moving microphagous feeders, scraping algae and other small invertebrates from substrate with their radula. Genera Katherina Cryptochiton
7 Polyplacophora Return to Polyplacophora representative genera. Katherina Katherina dorsal surface Katherina ventral surface
8 Polyplacophora Return to Polyplacophora representative genera. Cryptochiton Cryptochiton dorsal surface Cryptochiton ventral surface
9 Class Scaphopoda Back to Taxonomy Tooth shells (or Tusk shells) Shell and mantle slender, tubular, and slightly curved. It is open at both ends Dentalium
10 Class: Gastropoda Return to Taxonomy Univalves, Shell usually spiral, distinct head, scraping radula. Visceral mass typically turned 180 counterclockwise = torsion. And the visceral mass is coiled in shell. Representatives Garden snail (Helix), Whelks (Busycon), Conch, Cowries,, Sea hare, Nudibranchs, Slugs, and abalone.
11 Helix (garden snail) Helix, ventral view Helix, dorsal view Return to Gastropoda Helix, side view
12 Busycon (Whelk) Return to Gastropoda Busycon (shell removed) Busycon shells Busycon eggs
13 Other Gastropods Return to Gastropoda Abalone shells Conch Examples of gastropoda
14 Return to Gastropoda Other Gastropods (continues) Sea Hair (ventral view) Sea Hair side view Slug
15 Return to Taxonomy Class Bivalvia Shell of two lateral valves, with dorsal hinge. Mantle of flattened right and left lobes. Posterior margin commonly forming siphons Labial palps beside mouth No head No radula Representative bivalves
16 Representatives of Bivalvia Return to Bivalvia Anadonta (Freshwater clam) Teredo (Shipworm) Rock boring clam Ostrea (Oyster) Pecten (Scallop) Freshwater clam dissection
17 Return to Representatives Anadonta Dissection
18 Teredo (shipworm) Return to Representatives and the Rock boring worm Teredo Teredo in wood Rock boring clam
19 Oyster and Scallop Return to Representatives Scallop shells Oyster cluster Oyster shells
20 Return to Representatives Freshwater Clam Dissection External shell Internal shell Mantle (showing muscle One mantle flap removed. scars and pallial line) Visceral Mass (not dissected) Dissected Visceral Mass I Dissected Visceral Mass II Dorsal Heart Dorsal heart I(showing auricle or atrium) Dorsal heart II(showing ventricle) Dorsal heart III (ventricle)
21 External Shell Return to contents
22 Mantle Return to contents
23 Return to contents One side of mantle removed
24 Visceral Mass Return to contents
25 Return to contents Dissected Visceral Mass (I)
26 Return to contents Dissected Visceral mass (II)
27 Dorsal Heart I Return to contents
28 Dorsal Heart II Return to Contents
29 Dorsal Heart III Return to contents
30 Internal parts of shell Shell Return to contents Pallial line
31 Class Cephalopoda Return to Taxonomy Large head with conspicuous eyes Ventral foot modified into tentacles(are arms) with suckers. Representative Cephalopods Nautilus(Chambered Nautilus) Octopus (Octopus) Loligo (Squid) Sepia (Cuttle fish)
32 Return to Cephalopoda Nautilus (South Pacific and Indian Ocean)
33 Return to Cephalopoda Octopus Eight arms
34 Return to Cephalopoda Loligo Internal skeleton = Pen
35 Return to Cephalopoda Sepia Cuttlebone (internal skeleton)
36 Class Monoplacophora Return to Taxonomy First 10 specimens of Neopilina were taken in 1952 from dark muddy clay at 3350 m(11,000 ft) off the coast of Costa Rica. Since then other species have been found in Indo-Pacific and South Atlantic Oceans. Neopilina is the only living genus Neopilina has segmented muscles
true tissue Ancestral Protist
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