taxonomy Flashcards
fibrous, fluid filled sheath similar to the backbone
-provides strength for swimming
notochord
water incompressible
hydrostatic skeleton
used as a paddle
post anal tail
dont have a DHNC, notochord, or postanal tail as adults
Urochordata, Asiciduacea
larva with all present
Ascidian tadpole
absorb tail, notochord and DHNC
Metamorphosis
have myomeres and myosepta
cephalochordat
muscle bands
myomers
connective tissue between muscles
myosepta
jawless craniates
Agnatha
myxini
hagfish
hyperoartia
lampreys
females die after spawning and males die after eggs hatch
lampreys
larval stage of lamprey
ammocoete
oldest fossil record and first group to have pectoral fins
osetostraci
extinct at the end f permian
placodermi
sharks, skates, and rays
Elasmobranchii
-oily liver
gradual loss of caudal fin
rays
chimaeras or ratfish
no scales except spines
Holocephali