Bis2CF10.Lecture%2032

Bis2CF10.Lecture%2032 - Fall 2010 Lecture 32. Ecdysozoan...

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Fall 2010 Lecture 32. Ecdysozoan protostomes finish Gastropoda and Cephalopoda Introduce Ecdysozoa Introduce Arthropoda Students should be able to: Distinguish members of Lophotrochozoa and Ecdysozoa; recognize a nematode and outline two ways nematodes impact agriculture and human health describe the body plan of an arthropod explain the features & benefits of a tagmatized body plan .
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Modifications to generalized molluscan body plan Chitons (shell plates + repeated gills) and bivalves (burrowing foot)
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Modifications to generalized molluscan body plan Gastropods (torsion) and cephalopods (arms/tentacles + siphon for propulsion)
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Trochophore torsion as it becomes a veliger eventually an adult snail This pattern is presumed ancestral and works in water, but on land the early stages occur in the egg capsule and small snails hatch from shells; some marine gastropods do this also.
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Problems with life on land • how to reproduce: internal fertilization and hardened eggs so young do not dry out . In water On land
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Problems with life on land • how to respire: gills (external flaps) would dry out in the air, so an internal cavity is needed. mantle cavity has mantle with an enhanced blood supply = vascularized mantle cavity = lung Why should the lung opening be large? Why should the lung opening be small? On what plant structure do we see similar selection pressures?
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this opening lead? head
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This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

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Bis2CF10.Lecture%2032 - Fall 2010 Lecture 32. Ecdysozoan...

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