[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

New archosauriform (Archeopelta) and archosauromorphs (Augustaburiania & Protanystropheus)

From: Ben Creisler

Some new distant relatives of dinosaurs:

DESOJO, J. B., EZCURRA, M. D. and SCHULTZ, C. L. (2011)
An unusual new archosauriform from the Middle?Late Triassic of southern
Brazil and the monophyly of Doswelliidae. 
Zoological Journal of the Linnean Society, 161: 839?871. 
doi: 10.1111/j.1096-3642.2010.00655.x

Until now the Doswelliidae was considered a monospecific family including
Doswellia kaltenbachi from the Late Triassic of North America. The
phylogenetic position of this taxon remained enigmatic until recently, when
a sister-group relationship with the Proterochampsidae was suggested. In
the present contribution we describe the new doswelliid species Archeopelta
arborensis gen. et sp. nov. from the Middle?Late Triassic of Brazil. A
cladistic analysis recovered Archeopelta, Doswellia, and Tarjadia within a
monophyletic group of basal archosauriforms, the Doswelliidae. The
monophyly of this family is supported by the presence of osteoderm
ornamentation that is coarse, incised, and composed of regular pits and the
presence of an unornamented anterior articular lamina. Archeopelta is more
closely related to Doswellia than to other archosauriforms by the presence
of basipterygoid processes anterolaterally orientated, dorsal centra with a
convex surface, width of the neural arch plus ribs of the first primordial
sacral that are three times the length of the neural arch, and iliac blade
laterally deflected, with strongly convex dorsal margin, and a length less
than three times its height. The phylogenetic analysis indicates that
Doswellidae is the closest large monophyletic entity to Archosauria, which
achieved a wide palaeolatitudinal distribution during the late Middle and
Late Triassic time span.

This one has been out for a time but I don't recall seeing it mentioned yet
on the DML:
A. G. Sennikov (2011)
New tanystropheids (Reptilia: Archosauromorpha) from the Triassic of
Paleontological Journal 45(1): 90-104
DOI: 10.1134/S0031030111010151 

A new prolacertilian species and genus, Augustaburiania vatagini gen. et
sp. nov. (Reptilia: Archosauromorpha), from the Lower Triassic of the Don
River Basin is described. It is the first representative of the
Tanystropheidae in the Eastern Europe and the world oldest member of this
family. Another new genus (Protanystropheus gen. nov.) from Central and
Western Europe is also established. The diversity, systematics, phylogeny,
evolution, and stratigraphic and geographical distribution of
prolacertilians are discussed. The ecological role of prolacertilians in
Early Triassic communities and adaptation to marine environments are

mail2web LIVE ? Free email based on Microsoft® Exchange technology -