Details

Title: !Fishes 2

Description: Bony Fishes: Osteichthyes: Class Actinopterygii

Total Flash Cards: 12

Created: 11/11/2009 09:26:46

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Cards in this set:

Term
Actinopterygii
 Definition
ray-finned fishes
Term
evolutionary history
 Definition
mid-late devonian; radiation late paleozoic, as ostracoderms, placodemrs, adanthodians diminish
Term
fins
 Definition
w/ lepidotrichia, originate from scales
Term
fin support
 Definition
by internal girdles (contrast sarcopterygians whose fins have bony axis w/ muscle inside fin)
Term
tail
 Definition
2-lobed heterocercal
Term
cosamine
 Definition
none
Term
ganoine
 Definition
scales coverd w/ it, enamel layer
Term
evolutionary progression
 Definition
greater degree of adaptation to complex environments
Term
jaws evolution
 Definition
shorter mouth, many changed related to greater expandability and protrusibility
Term
scales evolution
 Definition
elimination of layers, including ganoine, become lighter, more flexible
Term
fins evolution
 Definition
become more flexible, mobile; developement of homocercal tail
Term
swimbladder evolution
 Definition
greater elaboration as buoyancy regulator; frees fins for maneuvers