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Plotopteridae facts for kids

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Plotopterids
Temporal range: EoceneMiocene
Fossil of sternum of Copepteryx from Kitahata Karatsu Japan.JPG
Copepteryx
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Suliformes
Family: Plotopteridae
Howard, 1969
Genera

Copepteryx
Hokkaidornis
Klallamornis
Olympidytes
Phocavis
Plotopterum
Stemec
Tonsala

Plotopteridae is the name of an extinct family of flightless seabirds from the order Suliformes. Related to the gannets and boobies, they exhibited remarkable convergent evolution with the penguins, particularly with the now extinct giant penguins. That they lived in the North Pacific, the other side of the world from the penguins, has led to them being described at times as the Northern Hemisphere's penguins, though they were not closely related. More recent studies have shown, however, that the shoulder-girdle, forelimb and sternum of plotopterids differ significantly from those of penguins, so comparisons in terms of function may not be entirely accurate. On the other hand, there is a theory that this group may have a common ancestor with penguins due to the similarity of brain morphology, and the actual classification is not clear.

Their fossils have been found in California, Oregon, Washington, British Columbia and Japan. They ranged in size from that of a large cormorant (such as a Brandt's cormorant), to being 2 m long. They had shortened wings optimised for underwater wing-propelled pursuit diving (like penguins or the now extinct great auk), and a body skeleton similar to that of the darter.

Tonsala hildegardae
Tonsala hildegardae fossils

The second species to be named from rocks along the eastern Pacific Ocean was Tonsala hildegardae from the late Oligocene lower part of the Pysht Formation in Washington State. More fossils of T. hildegardae have since been described and included some of the first known examples of borings made by the marine bone-eating worm Osedax in bird bones.

Copepteryx hexeris
Reconstruction of Copepteryx.

The earliest known member of the family, Phocavis maritimus lived in the late Eocene, but most of the known species lived during Oligocene time, becoming extinct in the early to mid-Miocene. That they became extinct at the same time as the giant penguins of the Southern Hemisphere, which also coincided with the radiation of the seals and dolphins, has led to speculation that the expansion of marine mammals was responsible for the extinction of the Plotopteridae, though this has not been formally tested.

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