BIO 2135 Lecture Notes - Chordate, Coelacanth, Unit In The Last Place

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Vertebrata (autapomorphies: neural crest cells, placodes, tripartite brain and cranium, axial skeleton with vertebrae. Vertebrata (autapomorphies: neural crest cells, placodes, tripartite brain and. Bio2135 animal form and function cranium: axial skeleton with vertebrae. Mixin (autapomorphies: three pairs of barbels, single nostril, loss of the pineal gland, reduction of the eyes and lateral line system. Pteromyzontida (autapomorphies: unique feeding structure with circular suction mouth with keratinized teeth, tounge covered in teeth. Gnathostomata (autapomorphies: genome duplication, jaw, paired fins. Chondrichthyes (autapomorphies: cartilaginous tesserate skeleton, placoid scales, heterocercal tail; claspers in the male, upper jaw formed from paleoquadrate cartilage, but not fused to the cranium. Reptilia (symplesiomorhies: bony skeleton replaces cartilage, teeth embedded in the jaw, swim bladder or lung formed from the gut. Actinopterygii (autapomorphies: fins supported with bony rays, swim bladder, modification of the jaw for suction feeding. Equilibrium between the two fluids never occurs. 11 (symplesiomorphies: fins supported by muscles and bones that extend into the fin, lobed fins.

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