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Jaxtasuchus, new archosauriform from Middle Triassic of Germany.



From: Ben Creisler
bcreisler@gmail.com

A new online paper:


Rainer R. Schoch & Hans-Dieter Sues (2013)
A new archosauriform reptile from the Middle Triassic (Ladinian) of Germany.
Journal of Systematic Palaeontology (advance online publication)
DOI:10.1080/14772019.2013.781066
http://www.tandfonline.com/doi/full/10.1080/14772019.2013.781066


Numerous well-preserved skeletal remains of a distinctive armoured
archosauriform reptile from the Lower Keuper (Erfurt Formation; Middle
Triassic: Ladinian: Longobardian) of Baden-Württemberg (Germany)
represent a new taxon, Jaxtasuchus salomoni gen. et sp. nov. The
dermal armour of Jaxtasuchus comprises transverse rows of four
rectangular osteoderms each in the cervical, dorsal and caudal
regions, with the individual plates closely resembling those of
Doswellia kaltenbachi from Carnian strata in North America. The long
and low maxilla of Jaxtasuchus held at least 15 teeth. The labial and
lingual surfaces of the tall, only slightly recurved crowns of the
maxillary teeth bear distinct vertical ridges and smooth mesial and
distal carinae. The cervical region of the vertebral column is long.
Phylogenetic analysis places Jaxtasuchus as the sister taxon to
Doswellia in Doswelliidae sensu Desojo et al. (2011). Doswelliidae is
diagnosed by the coarsely reticulate, incised ornamentation of
osteoderms composed of central regular pits of subequal size and
contour, and a mostly smooth anterior articular lamina on each
osteoderm. The discovery of Jaxtasuchus confirms that Doswelliidae had
a wide palaeogeographical distribution during the latter half of the
Triassic.