Phylum mollusca
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Phylum Mollusca. - From mollus meaning “ soft ”. Characteristics. Eucoelomate - True body cavity Hollow body cavity, Lined with peritonium (endodermis) Bilateral symmetry Most have Mantle Secretes shell - grows with organism Site of Respiration in terrestrial mollusks

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Phylum Mollusca

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Phylum mollusca

Phylum Mollusca

- From mollus meaning “soft”


Characteristics

Characteristics

  • Eucoelomate - True body cavity

    • Hollow body cavity, Lined with peritonium (endodermis)

  • Bilateral symmetry

  • Most have Mantle

    • Secretes shell - grows with organism

    • Site of Respiration in terrestrial mollusks

  • Tripoblastic - 3 tissue layers

  • Many Organ systems - well-defined circulatory, respiratory, excretory, and digestive systems


Characteristics contd digestion

Characteristics (Contd’)Digestion

  • Complete digestive tract

    • Separate mouth and anus

    • Radula

      • Rasping “file” with hundreds of tooth like structures

  • Feeding Patterns - filter feeders, herbivores, carnivores


Characteristics contd circulation

Characteristics (Contd’)Circulation

  • Some - Open Circulatory System

    • Ex. Gastropoda and bivalvia

  • Some - Closed circulatory system

    • Ex. Cephalopoda

  • All have hearts


Characteristics contd cephalization

Characteristics (Contd’) Cephalization

  • Brain with nervous system

    • Gastropoda and Cephalopoda

    • Exception Bivalvia no head=no brain

  • Sensory cells

    • All have - Touch, smell, taste, balance

    • Some have - True eyes

      • Cephalopoda and some Gastropoda


Classification

Classification

Phylum- Mollusca

  • 5 classes:

  • Gastropoda

  • Bivalvia

  • Cephalopoda

  • Polyplacophora

  • Scaphopoda


Class gastropoda stomach foot

Class- Gastropoda -“stomach foot”

  • Has one shell or none

  • Ex. Snails, slugs, sea slugs

Snail

Conch

Slug

Whelk

Abalone


2 class bivalvia two shells

2. Class Bivalvia - “Two Shells”

  • Ex. Clams, mussels, oysters, scallops

Mussel

Clam

Oyster

Scallop


3 class cephalapoda head foot

3. Class Cephalapoda -“head foot”

  • No shell or one

  • Ex. Squid, octopus, nautilus, cuttlefish

Nautilus

Octopus

Squid


4 class polyplacophora many plates

4. Class Polyplacophora -“many plates”

  • Mantle made of 8 dorsal plates

  • Ex. Chitons


5 class scaphopoda

5. Class Scaphopoda

  • Ex. Tooth shell ( aka. Tusk shell)


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