hibbertopterid
Eurypterida
order Eurypterida
genus Iridoprocne
Iridoprocne
arthropterygium
leanchoiliid
arthropod genus
paleoparadoxiid
hiodontid
amphiaspid
aspidorhynchid
archaeocyathid
genus Hirundo
dinocaridid
Hirundo
Burmeisteria
archaeogastropod
genus Burmeisteria
thunnosaur
neoichthyosaur
eryopid
parvipelvian
genus Hirudo
archegosaurid
stenopterygius
Hirudo
stenopterygiid
order Ichthyosauria
lobopod
land shrimp
pantodontan
Ichthyosauria
Stenopterygius quadrisicissus
eptatretus
haustoriid
lobopodian
doswellid
doswelliid
eriptychiid
hyainailourid
gyracanthid
ichthyosauromorph
spalacothere
nektaspidid
anomalocarid
basserolid
beardog
gaudeamurid
saurichthyiform