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Phylum Mollusca. Protostomes Protostomes Lophotrochozoan group Lophotrochozoan group Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa.

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Presentation on theme: "Phylum Mollusca. Protostomes Protostomes Lophotrochozoan group Lophotrochozoan group Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa."— Presentation transcript:

1 Phylum Mollusca

2 Protostomes Protostomes Lophotrochozoan group Lophotrochozoan group Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa Tridacna gigas

3 Phylum Mollusca Soft Bodied Soft Bodied Shelled Shelled Some without Some without Cephalization Cephalization Sensory organs Sensory organs Mouths Mouths Body Divisions Body Divisions Visceral Mass Visceral Mass Head-Foot Head-Foot Mantle Mantle Tonicella lineata

4 Phylum Mollusca Complete digestive tract Complete digestive tract Digestive glands Digestive glands Specialized feeding structures Specialized feeding structures Circulatory system Circulatory system Heart (2 chambers) Heart (2 chambers) Open system in most groups Open system in most groups Closed in cephalopods Closed in cephalopods Coelom restricted to pericardium in most cases Coelom restricted to pericardium in most cases Octopus briareus

5 Phylum Mollusca Advanced nervous system Advanced nervous system Brain Brain Sensory organs Sensory organs Eyes (simple and camera) Eyes (simple and camera) Sensory papillae Sensory papillae Excretory system Excretory system Kidney-like nephridia Kidney-like nephridia Reproduction Reproduction Monoecious and dioecious Monoecious and dioecious External development External development External & internal fertilization External & internal fertilization

6 Mollusc Phylogeny Mantle secreting shell Mantle secreting shell Muscular foot Muscular foot Chambered heart Chambered heart

7 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Chitons Chitons Chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell plates

8 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Subclasses: Subclasses: Prosobranchia Prosobranchia Shelled marine gastropods Shelled marine gastropods Atlantic triton’s trumpet (Charonia variegata) Tiger cowrie (Cypraea tigris)

9 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Subclasses: Subclasses: Prosobranchia Prosobranchia Opisthobranchia Opisthobranchia Sea slugs (marine) Sea slugs (marine) zebra sea goddess (Hypselodoris zebra) Spotted sea hare (Aplysia dactylomela) Phidiana hiltoni

10 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Subclasses: Subclasses: Prosobranchia Prosobranchia Opisthobranchia Opisthobranchia Pulmonata Pulmonata Terrestrial snails/slugs Terrestrial snails/slugs Freshwater snails Freshwater snails Helminthoglypta walkeriana Giant banana slug (Ariolimax columbians)

11 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Bivalvia Bivalvia Clams, oysters, mussels, scallops Clams, oysters, mussels, scallops Bay scallop (Aequipecten irradians) Edible mussels (Mytilus edulis) Ostrea edulis

12 Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Bivalvia Bivalvia Cephalopoda Cephalopoda Octopus, squid, nautilus Octopus, squid, nautilus Giant cuttlefish (Sepia latimanus) Nautilus sp Octopus sp

13 Generalized Mollusc Anatomy

14 Gastropod Feeding Apparatus

15 Respiration: Gills

16 Shell Structure & Formation

17 A Pearl Among the Swine

18 Mollusc Reproduction & Development Indirect development Indirect development Larval stages Larval stages Trochophore larva Trochophore larva Free swimming, ciliated, shell formation begins Free swimming, ciliated, shell formation begins Veliger larva Veliger larva Free swimming, ciliated velium forms, Free swimming, ciliated velium forms, Shell/body torsion occurs Shell/body torsion occurs Spat Spat Metamorphic form between veliger and juvenile Metamorphic form between veliger and juvenile Shell elaborates Shell elaborates

19 Trochophore Larva

20 Gastropod Veliger Larva Velia Mouth Shell

21

22 Zygote Trochophore Veliger Spat Juvenile Adult

23 Adult Abalone

24 Class Gastropoda The Shell Game

25 Class Gastropoda - Torsion

26 Gastropod Shell Coiling

27 Generalized Gastropod Anatomy

28 Marine Gastropods Cowries

29 Marine Gastropods Sea Hare – Aplysia sp

30 Marine Gastropods - Nudibranch

31 Terrestrial Gastropods - Pulmonata The mantle cavity serves as a “lung” The mantle cavity serves as a “lung” Glandular epidermis Glandular epidermis Secrete mucus (slime) upon which gastropod glides Secrete mucus (slime) upon which gastropod glides

32 Terrestrial Gastropod - Pulmonata Slugs lack shells Slugs lack shells Mantle thickened Mantle thickened Pneumostome Pneumostome Air intake into mantle cavity Air intake into mantle cavity Pneumostome

33 Phylum Mollusca, Class Bilvalia Two shells Two shells Incurrent & excurrent siphons Incurrent & excurrent siphons No cephalization No cephalization

34 Generalized Bivalve Anatomy

35 Bivalve Anatomy (Sagittal)

36 Bivalves are Typically Filter Feeders

37 Bivalve Life Cycle

38 Glochidia – Unique Larval Stage of Freshwater Bivalves Internal fertilization Internal fertilization Early development in brood chamber (region of mantle cavity) Early development in brood chamber (region of mantle cavity) Release of glochidia veliger larvae Release of glochidia veliger larvae Glochidia attach to gills of fish and are distributed Glochidia attach to gills of fish and are distributed

39 Phylum Mollusca, Class Cephalopoda Closed circulatory system Closed circulatory system Shell: lost in Octopus, extremely reduced and enclosed in mantle in squid, planar spiral in Nautilus Shell: lost in Octopus, extremely reduced and enclosed in mantle in squid, planar spiral in Nautilus Cephalization Cephalization eye eye Beak around mouth Beak around mouth Tentacles/arms Tentacles/arms

40 Cephalopod Anatomy

41 Squid are the largest Cephalopods

42 Cephalopod Eye

43 Mating

44 Direct Development in Cephalopods

45 Color & Morphology Changes for Camouflage


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