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SUMMARY:Gill arch serial homology and the origin of jawed vertebrates - An
 drew Gillis (University of Cambridge)
DTSTART:20150513T120000Z
DTEND:20150513T130000Z
UID:TALK57668@talks.cam.ac.uk
CONTACT:Marcia Kishida
DESCRIPTION:The jawed vertebrate body plan is defined largely on the basis
  of two anatomical features: jaws and paired appendages. In the late 19th 
 century\, Carl Gegenbaur proposed that both jaws and paired fins were deri
 ved members of a primitive series of gill arches. These controversial hypo
 theses of serial homology were based largely on the pharyngeal endoskeleta
 l anatomy of chondrichthyan fishes (e.g. sharks\, skates and holocephalans
 ). In this talk\, I will give an overview of how I am using oviparous (e.g
 . egg-laying) chondrichthyan fishes as experimental embryological model sy
 stems\, to determine the extent to which similarities in endoskeletal orga
 nization that led Gegenbaur to propose gill arch origins of jaws and fins 
 reflect constraints imposed by common developmental mechanisms (i.e. seria
 l homology)\, or rather convergent evolution.
LOCATION:Part II Lecture Theatre\, Department of Zoology
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