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Dyoplax, Triassic archosaur from Germany, re-evaluated



From: Ben Creisler
bcreisler@gmail.com


A new paper:

Michael W. Maisch, Andreas T. Matzke & Thomas Rathgeber (2013)
Re-evaluation of the enigmatic archosaur Dyoplax arenaceus O. Fraas,
1867 from the Schilfsandstein (Stuttgart Formation, lower Carnian,
Upper Triassic) of Stuttgart, Germany.
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 267(3): 353-362
DOI: http://dx.doi.org/10.1127/0077-7749/2013/0317
http://www.ingentaconnect.com/content/schweiz/njbgeol/2013/00000267/00000003/art00009

The holotype and only specimen of the small suchian archosaur Dyoplax
arenaceus O. Fraas, 1867 from the Stuttgart-Formation
(Schilfsandstein) of southwestern Germany is partially redescribed and
re-evaluated. The type locality can be identified as Stuttgart, not
Stuttgart-Feuerbach as erroneously suggested by previous authors. A
re-description of the skull and the dorsal armour provides several new
characters and a restoration of the skull is attempted for the first
time. The phylogenetic placement of Dyoplax is discussed. Although it
is agreed with previous authors that the taxon is not an aetosaur, its
placement in Crocodylomorpha is questioned. Instead we demonstrate
that Dyoplax has several important cranial and postcranial features in
common with Erpetosuchus from the Late Triassic of Scotland and North
America, and it is tentatively re-assigned to ?Erpetosuchidae.