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Temporal range: Emsian
Taemasosteus novaustrocambricus.jpg
Reconstruction of T. novaustrocambricus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Placodermi
Order: Arthrodira
Family: Buchanosteidae
White, 1952
Genus: Taemasosteus
White, 1952
Type species
Taemasosteus novaustrocambricus
White, 1952
  • T. novaustrocambricus White, 1952
  • T. maclartiensis

Taemasosteus is an extinct genus of arthrodire placoderm. Its fossils have been found in Emsian-aged marine strata in New South Wales, Australia. It contains two species, T. novaustrocambricus, and T. maclartiensis.

The genus (and a monotypic family, "Taemasosteidae") was originally erected on the basis of "an imperfect" paranuchal, though, more specimens were found, eventually leading "Taemasosteidae" to be subsumed into Buchanosteidae. Even so, the reconstructed anatomy leads some researchers[who?] to conclude that Taemasosteus is close to the ancestry of Homostiidae. These researchers[who?] place Taemasosteus as the sister taxon of Homostiidae (or a select group of the better known homostiid genera) within the taxon Migmatocephala.