[dinosaur] Chalishevia (Triassic erythrosuchid) redescribed (free pdf)

Ben Creisler
[email protected]

A new paper with free pdf:

Richard J. Butler, Andrey G. Sennikov, Martín D. Ezcurra, and David J.
Gower (2019)
The last erythrosuchid--a revision of Chalishevia cothurnata from the late
Middle Triassic of European Russia.
Acta Palaeontologica Polonica (in press)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00648.2019&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=8HWfIDKFNUv4HRxIHz0xiPT97W6AAv7FxR4baobVr4Y&s=_4ASLyodU6tgor08CR9JiT85sBcxeVTDUObovfUpmOY&e= 
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Free pdf:
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Erythrosuchidae is a clade of early archosauriform reptiles that were
large-bodied, hypercarnivorous, possibly apex pred-ators in late Early and
Middle Triassic ecosystems following the Permo-Triassic mass extinction.
Chalishevia cothurnata from the late Middle Triassic (Ladinian) of Russia,
is the stratigraphically youngest known erythrosuchid species, but the
holotype and referred material of this taxon has received little study.
Here, we provide the first detailed anatomical description of C.
cothurnata, including comparisons to other erythrosuchids. Although known
from relatively fragmentary material, the anatomy of C. cothurnata is
distinctive, including an autapomorphic strongly slanted ventral border of
the antorbital fossa. The presence of a large accessory opening (the
“accessory antorbital fenestra”) in the skull between the premaxilla, nasal
and maxilla, together with the inferred presence of a narrow postnarial
process of the premaxilla that articulated with a slot on the nasal,
provides strong evidence for a sister taxon relationship between C.
cothurnata and the erythrosuchid Shansisuchus shansisuchus from the early
Middle Triassic (Anisian) of China. The inferred basal skull length of C.
cothurnata was approximately 80 cm, making it one of the largest
erythrosuchids known.



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