Brachydeiroidea

Brachydeiroidea is a superfamily of small to moderately large-sized arthrodire placoderms from the Late Devonian of Europe and Eastern North America.

Brachydeiridae
Temporal range: Middle to Late Frasnian
Restoration of B. grandis
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Placodermi
Order:
Arthrodira
Suborder:
Brachythoraci
Infraorder:
Coccosteina
Superfamily:
Brachydeiroidea

Denison, 1978
Type species
Brachydeirus carinatus
Gross, 1932
Families

Brachydeiroids have, in cross section, a highly compressed body, a pointed, sometimes highly elongated snout, and tremendous orbits.[1] The plates of the trunk shield are noticeably shortened: in Synauchenia, the trunk shield and head shield are fused together as a single, immovable unit.[2] The superficial anatomy of brachydeiroids is extremely diverse.[1]

Families

Brachydeiridae

A diverse family of variable forms, restricted to the middle to late Frasnian of Europe.

Leptosteidae

This family is represented by two species in the genus Leptosteus. Leptosteids differ from brachydeirids by having comparatively smaller orbits and more elongated trunk shields.

See also

References
  1. Denison, Robert (1978). Handbook of Paleoichthyology, Volume 2, Placodermi. New York: Gustav Fischer Verlage. p. 73. ISBN 9780895740274.
  2. Denison, Robert (1978). Handbook of Paleoichthyology, Volume 2, Placodermi. New York: Gustav Fischer Verlage. p. 74. ISBN 9780895740274.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.