Phylum Mollusca. Bi-lateral Bi-lateral 3 body parts 3 body parts Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa Tridacna gigas.

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Presentation transcript:

Phylum Mollusca

Bi-lateral Bi-lateral 3 body parts 3 body parts Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa Tridacna gigas

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

Phylum Mollusca Complete digestive tract Complete digestive tract Digestive glands Digestive glands Specialized feeding structures (radula) Specialized feeding structures (radula) Circulatory system Circulatory system Heart (3 chambers) Heart (3 chambers) Open system in most groups Open system in most groups Closed in cephalopods Closed in cephalopods Octopus briareus

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 Anus Anus Reproduction Reproduction Most are separate sexes (snails are hermaphrodites Most are separate sexes (snails are hermaphrodites External (aquatic)& internal (land)fertilization External (aquatic)& internal (land)fertilization

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

Mollusc Taxonomy Major classes Major classes Gastropoda Gastropoda (stomach/foot) (stomach/foot) Snails, slugs Snails, slugs Atlantic triton’s trumpet (Charonia variegata) Tiger cowrie (Cypraea tigris)

Mollusc Taxonomy Major classes Major classes Bivalve Bivalve Clams, oysters, mussels, scallops Clams, oysters, mussels, scallops Bay scallop (Aequipecten irradians) Edible mussels (Mytilus edulis)

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

Generalized Mollusc Anatomy

A Pearl Among the Swine

Trochophore Larva

Adult Abalone

Class Polyplacophora - chitons

Class Gastropoda The Shell Game

Gastropod Shell Coiling

Marine Gastropods Cowries

Marine Gastropods Sea Hare – Aplysia sp

Marine Gastropods - Nudibranch

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

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

Generalized Bivalve Anatomy

Bivalve Anatomy (Sagittal)

Bivalves are Typically Filter Feeders

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

Cephalopod Anatomy

Squid are the largest Cephalopods

Nautilus Anatomy

Cephalopod Eye

Direct Development in Cephalopods

Color & Morphology Changes for Camouflage