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
Acanthodians, Actinopertygians, Sarcopterygians (us)
Teleostomi
fins with a spine and skin
oldest fossils with more sets of paired fins
Acanthodii
fins and muscles mostly in body
Actinopterygii
largest freshwater fish
Chondeostei
caudal fin
-more complex fins
Neopterygii
nearly all fish
Teleosts
The fish that developed into tetrapods
Saropterygii
developed homologous arm and leg bones, internal shanae, kinetic skull, etc
Eustgenopteron
loss of dorsal fin
Panderichthys
writs ankles, atalis
Titaalik
prevent twisting
zygapophyses
standard definiiton of praphyletic
Amphibia
frogs and toads
salientia
salamanders and newts
Caudata
caeclilians
Gymnophiona
has 3 membranes
amniotic egg
anapsid
turtles and early amniotes
diapsid
lizards, snakes crocodiles dinosaurs and birds
synapsid
mammals
pelycosaurs
euryapsid
plesiosaurs
ichthyosaurs
also reptillia
means lizard face
Sauropsida
most sauropsida and maybe turtles
diapsida
dolphin like
live birth
Ichthyosaurs
plesiosairs and mososaurs
mostly aquatic
laid eggs on shore or live young
relatives of lizards
Sauropterygia
have a kinetic skull
squamata
ruling reptiles
Archosauromorpha
- crocodylomorpha
- pterosauromorpha (pyncifibres)
saurischia
lizard-hipped
ornithischia
bird-hipped
mostly quadrupedal herbivores
sauropodomorpha
bipedal
theropoda