5-HistoryofFishes

5-HistoryofFishes - HistoryofFishes: JawlessFishes...

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Click to edit Master subtitle style  9/14/10 ChaPter 11, Chapter 13 History of Fishes: Jawless Fishes
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 9/14/10 Assignment 1
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 9/14/10 Quiz – Think-Pair-Share What is the difference between homology and  analogy? Give examples of both. In terms of hypotheses of homology based on  ontogeny, which is correct: Von Baer’s law or Meckel  Serres Law (Recapitulation)? What is the difference? Name all the sister taxa and  monophyletic groups in the  following tree
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Click to edit Master subtitle style  9/14/10 ChaPter 11, Chapter 13 History of Fishes: Jawless Fishes
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 9/14/10 Fishes were the first vertebrates Gaining an understanding of fish evolution enlightens  us about the origin of systems in all vertebrates and  ourselves Fish innovations that were passed down Dermal and endochondral bone (vertebral centra, braincase,  teeth) jaws brains appendages
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 9/14/10 500 million years of fish evolution Colonized the oceans, freshwaters and some also  emerged emigrating onto land Extant versus extinct forms.  Most forms now extinct.
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 9/14/10 Early Fossil Fishes Early fish fossils (from 500+ mya) already have  complex structures such as filamentous gills, V-shaped  myomers, and a distinct dorsal fin. Haikouichthys  eracaicunensis Myllokunmingia  fengjiaoa    4cm fossils from China
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 9/14/10 Fishes are Chordates Chordates have the following four characteristics at some stage of their ontogeny: dorsal hollow nerve cord , notochord , post-anal tail , and pharyngeal gill slits .
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 9/14/10 Phylum Chordata Echinodermata Hemichordata Urochordata Cephalochordata Craniata Chordates Relationships of living deuterostomes
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 9/14/10 Subphylum Urochordata Echinodermata Hemichordata Urochordata Cephalochordata Craniata
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 9/14/10 Subphylum Urochordata (tunicates) Sedentary adult stage with sack-within-a-sack morphology; only chordate feature is pharyngeal feeding apparatus.
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 9/14/10 Ontogeny of urochordates (tunicates) sessile adult mobile larvae
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 9/14/10 Tunicate larvae LARVAL urochordates have characteristics of adult chordates
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 9/14/10 Subphylum Cephalochordata Echinodermata Hemichordata Urochord ata Cephalochor data Craniata
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 9/14/10 Lancelets (Amphioxus) -  a fish?  Why not?
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This note was uploaded on 09/13/2010 for the course BIOL 4145 taught by Professor Chakrabarty during the Fall '09 term at LSU.

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5-HistoryofFishes - HistoryofFishes: JawlessFishes...

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