Details

Title: !Fishes 2

Description: Cartilaginous Fishes; Class Chondrichthyes

Total Flash Cards: 12

Created: 11/11/2009 08:02:15

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Cards in this set:

Term
evolutionary origin
 Definition
early Paleozoic, arose coincident w/ bony fishes; sister group to bony fishes; early fossil record poor
Term
skeleton
 Definition
cartilaginous, calcified not ossified
Term
fertilization
 Definition
internal; claspers in male
Term
scales
 Definition
placoid
Term
teeth
 Definition
derived from same tissue as scales; not fused w/ jaws, anchored in connective tissue; only in jaw margins; serial replacement(replacement whorls)
Term
intestine
 Definition
spiral valve
Term
static bouyancy mechanism
 Definition
no lungs/gas bladder
Term
water intake
 Definition
spiracles
Term
tail
 Definition
heterocercal
Term
osmoregulation
 Definition
urea
Term
embryonic development
 Definition
w/ physiological care: oviparous, ovoviviparous, viviparous
Term
success of chondrichthyes
 Definition
swimming adaptations, bouyancy control, body covering, osmoregulation adaptation, reproductive adaptations, sensory system