''Pinguosteus thulborni'' is a species of arthrodire placoderm from the Gogo Reef Formation, of Late

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. The proportions of its armor, coupled with the relative lack of otherwise diagnostic ornamentation on the armor make its classification difficult, and so it was placed as ''incertae sedis'' within the placoderm group

Coccosteina Coccosteina is an extinct infraorder of placoderms, armored fish most diverse during the Devonian.Heintz., Anatol, 1932, The structure of ''Dinichthys'', a contribution to your knowledge of the Arthrodira: In: The Bashford Dean Memorial Volume A ...

. It is the only known species of the genus Pinguosteus.

Etymology

The generic name is a compound of the Latin words ''pinguis'', meaning "fat," and ''os,'' meaning "bone," in allusion to the broad proportions of its armor plates. The specific name commemorates Dr. Tony Thulborn.

References

* Long, J. A. 1990a,
Two new arthrodires (placoderm fishes) from the Upper Devonian Gogo Formation, Western Australia
. Memoirs of the Queensland Museum 28, De Vis Symposium Volume, pp. 51–64. Enigmatic arthrodire taxa Placoderms of Australia Gogo fauna Fossil taxa described in 1990 Arthrodire genera {{placoderm-stub