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Phylum Mollusca Chapter 13 Part 1 of 3. General Characteristics Unsegmented Soft bodied critters - Bilateral symmetry Unsegmented Soft bodied critters.

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Presentation on theme: "Phylum Mollusca Chapter 13 Part 1 of 3. General Characteristics Unsegmented Soft bodied critters - Bilateral symmetry Unsegmented Soft bodied critters."— Presentation transcript:

1 Phylum Mollusca Chapter 13 Part 1 of 3

2 General Characteristics Unsegmented Soft bodied critters - Bilateral symmetry Unsegmented Soft bodied critters - Bilateral symmetry Shell formed by mantle secretions Shell formed by mantle secretions Body often protected by a valve (shell) Body often protected by a valve (shell) Dioecious (Greek for two households) separate sexes Dioecious (Greek for two households) separate sexes Aquatic & Terrestrial life styles Aquatic & Terrestrial life styles Complete digestive system Complete digestive system Open Circulatory System (gastropods & Bivalves) Open Circulatory System (gastropods & Bivalves) Closed Circulation in cephlapods Closed Circulation in cephlapods

3 Classification Based on presence or absence of a shell (valve), the number of shells and by the type of foot present Based on presence or absence of a shell (valve), the number of shells and by the type of foot present Class Gastropoda - stomach foot one valve: snails, slugs, abalone, nudibranchs. Class Gastropoda - stomach foot one valve: snails, slugs, abalone, nudibranchs. Class Bivalvia – two folding doors - clams, scallops, mussels, oysters Class Bivalvia – two folding doors - clams, scallops, mussels, oysters Class Cephalopoda - Head-foot – squid, octopus, cuttlefish, nautilus Class Cephalopoda - Head-foot – squid, octopus, cuttlefish, nautilus

4 Class Gastropoda snails, slugs, abalone, nudibranchs. snails, slugs, abalone, nudibranchs. stomach foot– most have one valve, some w/outstomach foot– most have one valve, some w/out Feed w/ cat-tongue-like radula Feed w/ cat-tongue-like radula Movement by creeping on a single foot. Movement by creeping on a single foot. Complete digestion, open circulation Complete digestion, open circulation A tight fitting plate ( operculum) attached to the foot that can be closed tight to protect the animal, a trap door A tight fitting plate ( operculum) attached to the foot that can be closed tight to protect the animal, a trap door

5 Class Bivalvia clams, scallops, mussels, oysters, clams, scallops, mussels, oysters, two folding doors – 2 shells secreted by the mantletwo folding doors – 2 shells secreted by the mantle On some, edges of mantle w/ sensory tentacles & eye spots On some, edges of mantle w/ sensory tentacles & eye spots Muscular foot Muscular foot Most are filter feeders – no radula Most are filter feeders – no radula Complete digestion, open circulation Complete digestion, open circulation We are dissecting clams…. We are dissecting clams…. Oyster w/ pearl

6 Clam Dissected 1.Valve 2.Anterior 3.Posterior 4.Dorsal 5.Ventral 6.Umbo

7 Class Cephalopoda Squid, octopus, cuttlefish, nautilus Squid, octopus, cuttlefish, nautilus Head-foot – shell extremely modified or even absentHead-foot – shell extremely modified or even absent Most intelligent of all invertebrates. Most intelligent of all invertebrates. Well developed vision ( best of all invertebrates) Well developed vision ( best of all invertebrates) All w/ arms & or tentacles All w/ arms & or tentacles All are Predators. All are marine All are Predators. All are marine Octopus – no shell present – foot modified into 8 arms Octopus – no shell present – foot modified into 8 arms Squid – well be dissecting squid, shell modified into flexible internal pen Squid – well be dissecting squid, shell modified into flexible internal pen Cuttlefish – internal hard shell (used by parakeet owners) Cuttlefish – internal hard shell (used by parakeet owners) Nautilus – external shell many tentacles Nautilus – external shell many tentacles

8 Cephalopods See the octopus?

9 Squid Dissection Trunk Neck Head Mantle Fin Tentacle Arm Siphon Eye sucker, teeth, stalk

10 Squid Dissection Try to identify: Arms, Tentacle, Eye, Siphon, Fin and Sucker

11 All Done w/ the Mollusks


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