March 12 2010

March 12 2010 - In the life cycle of a typical hydrozoan...

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In the life cycle of a typical hydrozoan (Class Hydrozoa), which of the following would most likely be free swimming? 1. Polyp (sedimentary) 2. Medusa (jellyfish) 3. Cnidocyte (stinging) 4. Cercaria (larva) Subphylum Hexapoda Insects and their names More species rich than all other animals Figure 33.37 Insect Anatomy - Insects are characterized by having 3 pairs of walking legs on the thorax - 1 or 2 pairs or wings - 3 body regions - Figure 33.35 Subphylum Crustace a Shrimp, lobsters, crabs, crawfish,… Bira mous appendages Gills for gas exchange Concept 33.8: Echinoderms a nd chordates are deuterostom es Echinoderms m ay not look like chordates, which include the vertebrates, but they sha com mon developm e ntal plan Deuterostom es - Radial Cleavage - Coelom develops from archenteron - Mouth forms opposite of blastopore - Figure 32.9 Phylum Echinoderm ata Echinoderm: spiny skin Slow m oving or s essile m arine animals Pentaradial sym m etry Unique water- vascular syste m
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This note was uploaded on 03/27/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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March 12 2010 - In the life cycle of a typical hydrozoan...

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