Ward_Lect35A_Chordata_ppt

Ward_Lect35A_Chordata_ppt - BIS2C Winter 2010 (Ward)...

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Unformatted text preview: BIS2C Winter 2010 (Ward) Lecture 35. Chordata, Part 2 Todays lecture (12 March) bony fish Tetrapoda, especially amniotes convergent evolution Review Session (Sunday, 14 March) 10:00 am 12:00 noon 123 SciLec BIS2C: Room assignments for final exam Section Students with the last name Go to A: Thursday 8am A-G 179 Chem H-Z 1100 SocSci B: Tuesday 1pm A-La 1001 Giedt Le-Z 1100 SocSci What are chordates? Deuterostomes with 1. Notochord 2. Dorsal hollow nerve cord 3. Postanal tail 4. Pharyngeal slits at least in embryo What about the endostyle/thyroid gland? endostyle : ciliated groove on the ventral surface of the pharynx (secretes mucus to gather food particles) found in urochordates and cephalochordates , and in the larvae of lampreys endostyle of larval lampreys metamorphoses into the thyroid gland in adults, and is regarded as being homologous to the thyroid gland in vertebrates Left to consider: bony fish and tetrapods 2 1: Cranium 2: Vertebrae 3: Bone 4: Jaws 5: Bone lost 1 3 4 5 Ray-finned fish (Actinopterygii) largest clade of bony fish (~24,000 species) very diverse feeding habits PNAS November 26, 2002 vol. 99 no. 24 15501- 15506 Cichlid fish radiation in east African lakes Coral reef fish Feeding in fishes: efficient unidirectional flow ....
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Ward_Lect35A_Chordata_ppt - BIS2C Winter 2010 (Ward)...

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