Details

Title: !Fishes 2

Description: Bony Fishes: Osteichthyes: Class Sarcopterygii: Subclass Dipnoi

Total Flash Cards: 12

Created: 11/11/2009 09:19:24

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Cards in this set:

Term
Dipnoi
 Definition
lungfishes
Term
history
 Definition
evolved lower Devonian, marine water; diverse in fresh
Term
share w/ coelocanths
 Definition
diphycercal tail (appears as 3 lobed in coelocanths, threadlike in lungfish); spiral valve; no vertebral centra
Term
head
 Definition
solid braincase, unlike coelocanths
Term
lungs
 Definition
functional; single in australian; double in s. american and african
Term
premax/max
 Definition
none
Term
tooth plates
 Definition
distinctive, teeth fused into crushing plates
Term
pectoral fin structure
 Definition
lobed in australian, filament in s. american and african
Term
cloaca
 Definition
present
Term
australian
 Definition
facultative airbreather, lung is gas bladder/buoyancy regulator; doesnt tolerate decissation
Term
s. american and african
 Definition
obligate airbreathers; african estivate, make through dry season enacases in mud cocoon
Term
estivation
 Definition
hibernation; busy in mucous cocoon burrow; small tube to surface w/ plug; rains/water in lung->awakens; o2 use very low; energy in protein (muscle); toxic urea levels (7x normal)