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

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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 ar e charact erized by h aving 3 p airs of walking legs on the thorax - 1 or 2 pairs or wings - 3 body regions - Figure 33.35 Subphylum Crustace a Shrimp, lobst ers, crabs, crawfish,… Bira mous app end ag es Gills for gas exchang e Concept 33.8: Echinoder m s a nd chordat es are d eut erosto m es Echinoder m s m ay not look like chordat es, which include the vertebrat es, but they sh a co m m on develop m e nt al plan Deuterostom es - Radial Cleavag e - Coelom d evelops from archent eron - Mouth forms opposite of blastopore - Figure 32.9 Phylum Echinoder m at a Echinoder m: spiny skin Slow m oving or s essile m arine anim als Pentaradial sym m etry
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