Buchanosteus Temporal range:Pragian–Emsian PreꞒ Ꞓ O S D C P T J K Pg N
Buchanosteus confertituberculatus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Placodermi
Order:	†Arthrodira
Suborder:	†Brachythoraci
Family:	†Buchanosteidae
Genus:	†Buchanosteus Stensiö, 1945
Type species
Phlyctaenaspis australis var.confertituberculata Chapman, 1916
Species
Buchanosteus confertituberculatus(Chapman, 1916) Buchanosteus guangxiensisWang, 2005 Buchanosteus nuricusMark-Kurik, 2004

Buchanosteus is an extinct genus ofarthrodireplacoderm. Its fossils have been found in EarlyDevonian-aged marine strata throughoutAsia andAustralia. It contains the following species:

• Buchanosteus confertituberculatus, the type species, is known from several specimens found from the Emsian-aged Taemas-Weejasper Reef in what is nowNew South Wales, Australia. It coexistedsympatrically with other buchanosteid genera there.
• Buchanosteus 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.
• Buchanosteus nuricus is known from one or two specimens from Emsian strata in the Qaranghandy Region in Kazakhstan, and named for theNura River. Is very similar in anatomy toB. confertituberculatus

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