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United States (206,189)
ZOO 4307C (9)
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Biology - Zoology
Course Code
ZOO 4307C

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Holostei (gars+bowfins) Monday, February 24, 2014 11:59 PM • Gars (lepisosteiformes) ○ Highly modified relative to other primative actinopterygians ○ Differ from all other living fishes in having vertebrae that are convex anteriorly and concave posteriorly,called opisthocoelous  All other fishes are concaveon both ends (A), called amphicoelous  • Bowfin (amiiformes) ○ Differ from all moreprimitive living actinopterygians in having single layered cycloid scales that lack ganoine ○ Caudal fin is abbreviate heterocercal,like gars (ie not very symmetrical) Amphibians Tuesday, February 25, 2014 6:29 AM • 3 extant lineages ○ Caecilians ○ Frogs ○ Salamanders • Amphibia is monophyletic • First amphibian during devonian era • First fossiles representtive of modern amphibians: permian • Recognizible frogs, salamanders, cacelians all
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