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Phylum Mollusca. Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda. Molluscs. Have adapted to a wide variety of habitats Terrestrial, marine, benthic, and accomplished swimmers. The Molluscan Body Plan. The body plan is similar and distinct from all other phyla

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phylum mollusca

Phylum Mollusca

Polyplacophora

Gastropoda

Bivalvia

Scaphopoda

Cephalopoda

Phylum Mollusca

molluscs
Molluscs
  • Have adapted to a wide variety of habitats
    • Terrestrial, marine, benthic, and accomplished swimmers.

Phylum Mollusca

the molluscan body plan
The Molluscan Body Plan
  • The body plan is similar and distinct from all other phyla
  • The Mollusca body plan includes:
    • A large muscular foot
    • A radula
    • Mantle and mantle cavity
    • Usually a small head
    • Soft unsegmented body
    • A hard non-living calcareous shell

Phylum Mollusca

the foot
The Foot

Phylum Mollusca

the radula
The Radula
  • Radula
  • Some molluscs have a rod of digestive enzymes (crystalline style) in the stomach

Phylum Mollusca

the mantle
The Mantle
  • The mantle is the body wall that enclose the body cavity

Phylum Mollusca

the mantle cavity
The Mantle Cavity
  • Houses the viscera and comb-like molluscan gills
    • Ctenidia are respiratory in function and can collect food particles
  • Mantle cavity also is the site for reproductive, excretory, and digestive systems

Phylum Mollusca

taxonomic summary
Taxonomic Summary
  • Phylum Mollusca
    • Class Polyplacophora
    • Class Gastropoda
      • Subclass Prosobranchia
      • Subclass Opisthobranchia
    • Class Bivalvia
    • Class Scaphopoda
    • Class Cephalopoda

Phylum Mollusca

class polyplacophora
Class Polyplacophora
  • Defining characteristics
    • Shell forms as a series of 7 to 8 separate plates
  • Chitons

Phylum Mollusca

chiton lifestyles
Chiton Lifestyles
  • Found close to shore mainly in the intertidal where they live on hard substrates

Phylum Mollusca

chiton anatomy
Chiton Anatomy

Phylum Mollusca

ingestion and digestion
Ingestion and Digestion
  • Radula is used to scrape algae from the rocks
  • Mouth is anterior and anus is posterior; linear digestive tract

Phylum Mollusca

reproduction
Reproduction
  • Reproduction
    • Sexes are separate with fertilization occurring in the water column
    • Trochophore larvae
      • Free swimming which settles and metamorphoses into an adult

Phylum Mollusca

local representative
Local Representative
  • Eastern Beaded Chiton (Chaetopleura apiculata)
    • Occurs subtidally on old shells

Phylum Mollusca