Mollusca Classification PDF
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This document provides a classification of different types of mollusks and details their various anatomical systems, such as digestion, circulatory system, respiratory system, nervous system, and reproductive system. Diagrams are also included for illustration of the key concepts.
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# Mollusca ## Polyplacophora - **Examples:** chitin - **Diagrams:** valves - **Digestion:** radula - **Circulatory:** open, sinuses-vessel, heart-gills - **Respiratory:** gills inside mantle cavity - **Nervous:** simple (chemoreceptors, touch, statocysts, ocelli) - **Reproduction:** external, egg &...
# Mollusca ## Polyplacophora - **Examples:** chitin - **Diagrams:** valves - **Digestion:** radula - **Circulatory:** open, sinuses-vessel, heart-gills - **Respiratory:** gills inside mantle cavity - **Nervous:** simple (chemoreceptors, touch, statocysts, ocelli) - **Reproduction:** external, egg & sperm, larval (trochophore) ## Gastropoda (stomach-foot) - **Examples:** snails, sea slugs, nudibranchs - single coiled valve - no valve - not coiled - **Diagrams:** - **Digestion:** radula - **Circulatory:** open - **Respiratory:** gills - **Nervous:** simple - **Reproduction:** external ## Bivalvia - **Examples:** clams, oysters, scallops - **Diagrams:** - **Digestion:** siphon - **Circulatory:** open - **Respiratory:** use siphon gills - **Nervous:** simple - **Reproduction:** external (internal) ## Cephalopoda - **Examples:** - **Nautiloids (external):** 80-90 tentacles, nautilus - **Decapods (internal):** squid, cuttlefish, 8 short, 2 long - **Octopods (none):** 8 tentacles, Octopus - **Diagrams:** - **Digestion:** radula - **Circulatory:** closed - **Respiratory:** gills, expelled through siphon - **Nervous:** developed, sight, fedore by touch, chromotophories, intelligent - **Reproduction:** internal, dioecious
