''Exutaspis megista'' is an extinct, "giant"
buchanosteid arthrodire placoderm. Its fossils have been found in the Late
Emsian-
aged
Ageing ( BE) or aging ( AE) is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In a ...
marine strata of the Jiucheng and Haikou Formations in Wuding, Yunnan.
It was originally described as a
phlyctaeniid
Phlyctaeniidae is an extinct family of placoderm fishes that lived during the Devonian period, mainly in Norway and North America.
Phylogeny
ORDER ARTHRODIRA
* Infraorder Actinolepina
** Family Actinolepidae
* Suborder Phlyctaenioidei
** Fam ...
. Later, after comparison with the Chinese ''
Buchanosteus
''Buchanosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Early Devonian-aged marine strata throughout Asia and Australia. It contains the following species:
*''B. confertituberculatus'', the type species, is ...
guanxianesis'', ''Exutaspis'' was reappraised as a buchanosteid. The holotype, a "head roof," is long.
References
Buchanosteidae
Placoderms of Asia
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