Extinct animals of North America

left|thumb| Life restoration of Proterogyrinus

species of locust

species of mammal (fossil)

species of bird (fossil)

species of bird

Phalarodon is an extinct genus of mixosaurid ichthyosaur known from the Middle Triassic (247.2-242.0 million years ago). Its name is derived from the Greek φάλαρα (phálara) ("boss on the cheek plate of a helmet") and odon ("tooth"). The genus has had a tumultuous history since its classification in 1910, with different workers describing species under different genera or declaring the genus to be a nomen dubium. Currently three species are recognized, but more have been identified in the past.

species of mollusc

species of insect

Simoedosaurus is an extinct reptile known from the Paleocene of North America, Europe and western Asia, and a member of the Choristodera, a group of aquatic reptiles that lived in the Northern Hemisphere from the Jurassic to the early Cenozoic.

Schowalteria is a genus of extinct mammal from the Cretaceous of Canada. It is the earliest known representative of order Taeniodonta, a specialised lineage of eutherian mammals otherwise found in Paleocene and Eocene deposits. It is notable for its large size, being among the largest of Mesozoic mammals, as well as its speciation towards herbivory, which in some respects exceeds that of its later relatives.

species of insect

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The longnut (Pleurobema nucleopsis) was a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

Ceraurus is a genus of cheirurid trilobite of the middle and, much more rarely, the upper Ordovician. They are commonly found in strata of the lower Great Lakes region. These trilobites have eleven thoracic segments, a very small pygidium and long genal and pygidial spines.

Chelosphargis is an extinct genus of sea turtle from Upper Cretaceous of Alabama. Only one species has been described, Chelosphargis advena.