omphalotrochid
aigialosaurid
neoichthyosaur
parvipelvian
Eurypterida
protorosaur
anchiornithid
tanystropheid
phoebodontiform
pycnodontiform
Uintatheriidae
arthropod genus
Arachnida
class Arachnida
palaeonisciform
polyglyphanodontian
eutriconodontan
palaeobatrachid
family Uintatheriidae
euomphalid
therapsid
Ictodosauria
anomocarid
order Ictodosauria
stryacocephalid
sea scorpion
pistosauroid
order Sauropterygia
thalattosaur
Sauropterygia
choristoderan
arthropleurid
bystrowianid
gyracanthid
mammaliamorph
Stenopterygius quadrisicissus
anamorphosis
stenopterygius
petalodontiform
dissorophid
opisthodontian
polydolopimorphian
Belemnoidea
Sisyridae
nothosaur
dinornithiform
semionotiform
ankylopollexian
phoebodont
family Sisyridae