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!Fishes 2
Jawless Fishes; Superclass Agnatha:Hagfishes
15
Biology
Undergraduate 4
11/10/2009
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Term
Class Myxini
 Definition
Order Myxiniformes: slimers, primitive
Term
Myxiniformes
 Definition
named for unique slime-producing glands; single fish can fill 10 gal tank with slime instantly
Term
jaws?
 Definition
no jaws
Term
fins
 Definition
no paired fins, continuous caudal fin
Term
vert
 Definition
no vert
Term
scales
 Definition
no scales
Term
circulatory system
 Definition
open w/ blood sinuses and 4 hearts, accessory hearts restore flow after blood leaves sinuses
Term
skull
 Definition
not much of one
Term
vision
 Definition
degenerate eyes
Term
mouth
 Definition
tentacles around, keratinous teeth on sides
Term
nose
 Definition
single nostril for water intake and olfaction
Term
sensory
 Definition
one semicircular canal
Term
reproduction
 Definition
single gonad
Term
fossil
 Definition
one fossil specimen; late Carboniferous (360mya)
Term
habits
 Definition
marine, soft sediment; direct development from eggs
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