5-HistoryofFishes - HistoryofFishes: JawlessFishes...

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Click to edit Master subtitle style 9/14/10ChaPter 11, Chapter 13History of Fishes:Jawless Fishes
 9/14/10Assignment 1
 9/14/10Quiz – Think-Pair-ShareWhat 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
Click to edit Master subtitle style 9/14/10ChaPter 11, Chapter 13History of Fishes:Jawless Fishes
 9/14/10Fishes were the first vertebratesGaining an understanding of fish evolution enlightens us about the origin of systems in all vertebrates and ourselvesFish innovations that were passed downDermal and endochondral bone (vertebral centra, braincase, teeth)jawsbrainsappendages
 9/14/10500 million years of fish evolutionColonized the oceans, freshwaters and some also emerged emigrating onto landExtant versus extinct forms.  Most forms now extinct.
 9/14/10Early Fossil FishesEarly fish fossils (from 500+ mya) already have complex structures such as filamentous gills, V-shaped myomers, and a distinct dorsal fin.Haikouichthys eracaicunensisMyllokunmingia fengjiaoa 4cm fossils from Chinaresemble hagfish and
 9/14/10Fishes are ChordatesChordates have the following four characteristics atsome stage of their ontogeny:dorsal hollow nervecord,notochord,post-anal tail,andpharyngeal gill slits.
 9/14/10Phylum ChordataEchinodermataHemichordataUrochordataCephalochordataCraniataChordatesRelationships of livingdeuterostomes
 9/14/10Subphylum UrochordataEchinodermataHemichordataUrochordataCephalochordataCraniata
 9/14/10Subphylum Urochordata (tunicates)Sedentary adult stage with sack-within-a-sack morphology;only chordate feature is pharyngeal feeding apparatus.
 9/14/10Ontogeny of urochordates (tunicates)sessile adultmobile larvae
 9/14/10Tunicate larvaeLARVAL urochordates have characteristics ofadult chordates
 9/14/10Subphylum CephalochordataEchinodermataHemichordataUrochordataCephalochordataCraniata
 9/14/10Lancelets (Amphioxus) -  a fish?  Why not?8 cm slender bodied organisms that are fossorial as adultsTell us a lot about fish evolution Amphioxus (Cephalochrodata:Branchiostoma)

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Term
Fall
Professor
Chakrabarty
Tags
Ichthyology, lampreys, Jawless Fishes, Ostracoderms, extinct jawless fishes

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