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Mollusca. Basic Body Plan Muscular foot Gills Mantle – may secrete a shell Visceral mass Many have a scraping Radula Trochophore larvae.

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Presentation on theme: "Mollusca. Basic Body Plan Muscular foot Gills Mantle – may secrete a shell Visceral mass Many have a scraping Radula Trochophore larvae."— Presentation transcript:

1 Mollusca

2 Basic Body Plan Muscular foot Gills Mantle – may secrete a shell Visceral mass Many have a scraping Radula Trochophore larvae

3 Molluscan Body Plan

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5 Molluscan Classes Amphineurea (Polyplacophora) – Chitons Bivalvia (Pelecypoda) Cepahlopoda Gastropoda Phylum also include rarer classes (not covered in lab) Monoplacophora Scaphopoda

6 Mollusca Evolution

7 Chitons Eight Plates hinged together underneath skin Dorsally flattened Scrape algae off rocks with radula Marine

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10 Gumboot Chiton

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12 Bivalvia Mantle split in two- making two hinged shells Suspension feeders Incurrent- excurrent siphons bring water in /out Gills and palps collect and move particles to mouth

13 Fresh water Larvae- Glochidia #44

14 Clam Anatomy

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16 Intestine Heart Mantle Visceral mass Gills Foot #41

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18 Clam Gill # 42

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20 Radula #40

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23 Clam Dissection Gills

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25 Incurrent Siphon Excurrent Siphon

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27 Heart- Open Circ. System Pericardial cavity (Ceolom)

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29 Cephalopoda

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37 Gastropoda

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