''Buchanosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Early

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 ...

-aged marine strata throughout

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...

and

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 ...

. It contains the following species: *''B. confertituberculatus'', the type species, is known from several specimens found from the Emsian-aged Taemas-Weejasper Reef in what is now

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

, Australia. It coexisted

sympatric In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. An initially interbreeding population that splits into two or more distinct species sh ...

ally with other buchanosteid genera there. *''B. guangxianensis'' is known primarily from a well-preserved, albeit incomplete endocranium from Pragian-aged deposits near Guangxi, China. It is compared to another buchanosteid, the "giant" '' Exutaspis'' from the late Emsian Wuding Formation in Yunnan. *''B. nuricus'' is known from one or two specimens from Emsian strata in the Qaranghandy Region in Kazakhstan, and named for the

Nura River The Nura ( kk, Нұра, ''Nura''; russian: Нура) is a major watercourse of northeast-central Kazakhstan. It is long and drains an area of . Course The river rises in the Kyzyltas mountains, a subrange of the Kazakh Uplands and flows initial ...

. Is very similar in anatomy to ''B. confertituberculatus''

References

Buchanosteidae Placoderms of Asia Placoderms of Australia {{Placoderm-stub