Ward_Lect35A_Chordata_ppt

Ward_Lect35A_Chordata_ppt - BIS2C Winter 2009 (Ward)...

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BIS2C Winter 2009 (Ward) Lecture 35. Chordata, Part 2 Today’s lectures (11 March) finish Echinodermata introduction to Chordata major features early chordate evolution origin of vertebrates jawless and jawed fish Tetrapoda, especially amniotes convergent evolution
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Left to consider: bony fish and tetrapods 2 1: Cranium 2: Vertebrae 3: Bone 4: Jaws 5: Bone lost 1 3 4 5
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Ray-finned fish (Actinopterygii) largest clade of bony fish (~24,000 species) very diverse feeding habits
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PNAS November 26, 2002 vol. 99 no. 24 15501- 15506 Cichlid fish radiation in east African lakes
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Coral reef fish
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Feeding in fishes: efficient unidirectional flow . Water goes in the mouth, out the pharyngeal slits. Pacu: seed-eating piranha
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Vertebrate phylogeny: a major transition from water to land (and back again) Aquatic only Terrestrial with secondarily aquatic species (= the tetrapods)
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Vertebrate phylogeny: a major transition from water to land (and back again) Colonization of land involved use of lungs modification of jointed fins to become limbs
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Amphibians require moist environments lose water rapidly through skin early stages often require water
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Amphibians – three extant clades (A) Caecilians (limbless); (B) Frogs and toads (tailless); and (C, D) Salamanders (tailed)
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Ward_Lect35A_Chordata_ppt - BIS2C Winter 2009 (Ward)...

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