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