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Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda

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Presentation on theme: "Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda"— Presentation transcript:

1 Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda
Phylum Mollusca Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda Phylum Mollusca

2 Molluscs Have adapted to a wide variety of habitats
Terrestrial, marine, benthic, and accomplished swimmers. Phylum Mollusca

3 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

4 The Foot Phylum Mollusca

5 The Radula Radula Some molluscs have a rod of digestive enzymes (crystalline style) in the stomach Phylum Mollusca

6 The Mantle The mantle is the body wall that enclose the body cavity
Phylum Mollusca

7 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

8 Taxonomic Summary Phylum Mollusca Class Polyplacophora
Class Gastropoda Subclass Prosobranchia Subclass Opisthobranchia Class Bivalvia Class Scaphopoda Class Cephalopoda Phylum Mollusca

9 Class Polyplacophora Defining characteristics Chitons
Shell forms as a series of 7 to 8 separate plates Chitons Phylum Mollusca

10 Chiton Lifestyles Found close to shore mainly in the intertidal where they live on hard substrates Phylum Mollusca

11 Chiton Anatomy Phylum Mollusca

12 Ingestion and Digestion
Radula is used to scrape algae from the rocks Mouth is anterior and anus is posterior; linear digestive tract Phylum Mollusca

13 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

14 Local Representative Eastern Beaded Chiton (Chaetopleura apiculata)
Occurs subtidally on old shells Phylum Mollusca

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