Details

Title: !Fishes 2

Description: Origin of Fishes

Total Flash Cards: 9

Created: 11/10/2009 22:35:09

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Additional Biology Flashcards

Cards in this set:

Term
from what?
 Definition
verts arose from chordate anscestors
Term
first vert derived?
 Definition
by retention of larval features into adult stage (neoteny-can reproduce)
Term
neoteny
 Definition
larvae can reproduce
Term
spinal cord of vertebrae
 Definition
jointed axial skeleton, provided mobility; hagfish/lamprey dont have real backbones
Term
braincase or cranium of verts
 Definition
more pronounced cephalization
Term
Subphylum Vertebrata synapomorphies
 Definition
bone, spinal column of vert, braincase/cranium
Term
where verts came from?
 Definition
early evolution of fishes in marine or estuarine waters; diversification in fresh water; anadromous origin
Term
when verts originated?
 Definition
armored verts in Ordovician, 485 mya; prob in Cambrian, ca 600 mya, or before
Term
Conodonts
 Definition
microscopic "cone teeth" , date marine secidments (late proterozoic to late triassic 600-200mya); cellular bone, lack dentine on teeth. cell bone derived, dentine primitive