''Atlantidosteus'' is an extinct genus of homostiid

arthrodire Arthrodira (Greek for "jointed neck") is an Order (biology), order of extinct armored, jawed fishes of the class Placodermi that flourished in the Devonian period before their sudden extinction, surviving for about 50 million years and penetratin ...

from the

Early Early may refer to: History * The beginning or oldest part of a defined historical period, as opposed to middle or late periods, e.g.: ** Early Christianity ** Early modern Europe Places in the United States * Early, Iowa * Early, Texas * Early ...

Middle 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, wher ...

Morocco Morocco (),, ) officially the Kingdom of Morocco, is the westernmost country in the Maghreb region of North Africa. It overlooks the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to ...

and

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_ ...

. It contains two known species, ''A. hollardi'' and ''A. pacifica''.

Description

''Atlantidosteus pacifica'' is known from a right suborbital plate, found in the Broken River Group of Queensland, Australia.

Phylogeny

''Atlantidosteus'' is part of the

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

Migmatocephala, closer related to Homostius, than

Antineosteus ''Antineosteus'' is an extinct genus of homostiid arthrodire from the Emsian, Early Devonian Kess-Kess Mounds, in the eastern Anti-Atlas Mountains, Morocco, and the Barrandian area of the Czech Republic. Description ''Antineosteus lehmani'' i ...

. {{Clade, style={{Clade , 1=''

Tityosteus ''Tityosteus'' is an extinct genus of homostiid arthrodire from the Early Emsian of the Early Devonian, with fossils known from Germany, the Ibero-Armorican Trough, and southern Siberia. Description ''Tityosteus'' has only an 11 cm ri ...

'' , 0=''

Taemasosteus ''Taemasosteus'' is an extinct genus of arthrodire placoderm. Its fossils have been found in Emsian-Epoch (geology), aged marine strata in New South Wales, Australia. It contains two species, ''T. novaustrocambricus'', and ''T. maclartiensis''. ...

'', 4={{Clade , 1=''

'' , 2={{Clade , 1=''Atlantidosteus'' , 2='' Homostius'' The cladogram shown here is based on Young, 2003

References

{{Arthrodira, E {{Taxonbar, from=Q116235769 Fossil taxa described in 1984 Homostiidae Arthrodire genera Placoderms of Australia Placoderms of Africa {{Placoderm-stub