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!Fishes 2
Bony Fishes: Osteichthyes: Class Actinopterygii: Subclass Chondrostei
8
Biology
Undergraduate 4
11/11/2009
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Term
Chondrostei
 Definition
cartilaginous bony fishes; most primitive living actinopterygians
Term
primitive features
 Definition
spiral valve intestine; no centra; heterocercal tail; ganoid scales (scutes on sturgeons-enamel layer of ganoine, pulp cavity lacking)
Term
skeleton
 Definition
cartilaginous
Term
tail
 Definition
heterocercal
Term
spiracle
 Definition
present
Term
intestine
 Definition
spiral valve
Term
sensory
 Definition
ampullae of lorenzini
Term
osteichythyes traits
 Definition
branchiostegal rays, pleural ribs
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