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!Fishes 2
Superclass Gnathostomata: Class Acanthodii
10
Biology
Undergraduate 4
11/11/2009
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Term
origin
 Definition
first jawed fishes; before and after placoderms
Term
when
 Definition
silurian, devonian, remained until permian
Term
scales
 Definition
bony scales
Term
fins
 Definition
preceded by ornamented spines
Term
gills
 Definition
covered with gill cover
Term
endoskeleton
 Definition
partially oscified
Term
teeth
 Definition
present or absent; when present often fused to jaws
Term
stout spines
 Definition
associated w/ paired and medial fins
Term
multiple paired intermediate spines
 Definition
occur no where else
Term
body
 Definition
streamlined, reduced armor, fin placement: more pelagic than placoderms
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