114 - November 4, 2011 Chordata 1. Garstang's hypothesis a)...

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November 4, 2011 Chordata 1. Garstang's hypothesis a) lancelets (look like primitive vert) actually not as related to primitive verts as the urochordates 2. class Cephalaspidomorphi (lamprey) a) suctorial mouth with horny teeth b) seven pairs of gill slits c) free living and ectoparasites Super class Agnatha 3. class Mixini (hagfish) a) terminal mouth with four pairs of tentacles b) 5-15 pairs of gill pouches c) partially hermaphroditic d) produce mucous slime as defense Super Gnathostomata 4. class chondrichthyes: (cartillaginous fishes) a) sharks, skates, rays, chimaeras, ratfish b) fish with cartilaginous skeletons c) teeth not fused to jaw (usually with replacement) d) five to seven gill slits e) no swim bladder 5. class Actinopterygii: (ray finned fishes) a) ossified skeleton b) single gill opening covered by operculum c) paired fins supported by dermal rays d) swim bladder as hydrostatic organ e) mucous glands in skin 6. Class Actinisia: (lobed finned species) a) Coelacanth is the only living member
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114 - November 4, 2011 Chordata 1. Garstang's hypothesis a)...

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