29_Ward_Mollusca_Outline - BIS2C W2011 Mollusca...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BIS2C W2011 Lecture 29 (28 February 2011) 1 Mollusca Characteristics Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… complete gut reduced coelom open circulatory system characteristic body plan: mantle, visceral mass, and foot mouth with radula well developed nervous system and excretory system Foot: large ventral muscle mass (modified ventral body wall) Mantle: fold of tissue covering visceral mass and enclosing mantle cavity (dorsal body wall) Visceral mass: body proper Modifications to generalized molluscan body plan Chitons (shell plates and repeated gills) Gastropods (torsion) Bivalves (burrowing foot) Cephalopods (arms/tentacles + siphon for propulsion) Molluscan biology ~100,000 living species (70,000 fossil species) range in size from microscopic to very large mostly aquatic; a few terrestrial herbivores, detritivores, carnivores, filter feeders, parasites Reproduction mostly dioecious (separate sexes), some hermaphrodites
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/09/2011 for the course BIS 2 taught by Professor Coolprof during the Spring '11 term at Bank Street College of Education.

Page1 / 2

29_Ward_Mollusca_Outline - BIS2C W2011 Mollusca...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online