BIS2C_Lect29_Ward_Mollusca_ppt

BIS2C_Lect29_Ward_Mollusca_ppt - 1 BIS2C Winter 2012 (Ward)...

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Unformatted text preview: 1 BIS2C Winter 2012 (Ward) Lecture 29. Mollusca Today’s lecture (7 March) • introduction to Mollusca • major features • biology • within-group diversity Friday’s lecture • Annelida Diversity within lineages changes over time Diversity within lineages changes over time Major lineages of metazoans Bilateria Major lineages of metazoans Protostomes Protostomes Mollusks 2 Clicker Question 1. Which of the following conditions is not seen in Mollusca? a. Spiral cleavage b. Coelom formed by splitting of mesoderm (schizocoely) c. Anus derived from blastopore d. Mesoderm arising near lip of blastopore e. Triploblasty Protostomes Mollusks • mouth from blastopore • mesoderm arising near lip of blastopore • schizocoely Protostomes Mollusks • spiral cleavage • mouth from blastopore • mesoderm arising near lip of blastopore • schizocoely Protostomes Mollusks • spiral cleavage • trochophore larva • mouth from blastopore • mesoderm arising near lip of blastopore • schizocoely Numbers of described species among the major animal groups (from Wilson, 1992). 3 Numbers of described species among the major animal groups (from Wilson, 1992). Mollusca Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… • complete gut , regionally specialized Mollusca Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… • complete gut • reduced coelom (vestiges around heart, gonads, and some other organs) Mollusca Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… • complete gut • reduced coelom • open circulatory system (hemocoel), with heart—usually three-chambered—and associated vessels Mollusca Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… • complete gut • reduced coelom • open circulatory system (hemocoel) • characteristic body plan: mantle , visceral mass , and foot Mollusca Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… • complete gut • reduced coelom...
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BIS2C_Lect29_Ward_Mollusca_ppt - 1 BIS2C Winter 2012 (Ward)...

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