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Parasuchus (Indian Triassic phytosaur) relationships
A new online paper:
Christian F. Kammerer, Richard J. Butler, Saswati Bandyopadhyay and
Michelle R. Stocker (2015)
Relationships of the Indian phytosaur Parasuchus hislopi Lydekker, 1885.
Papers in Palaeontology (advance online publication)
The neotype skull of the Indian phytosaur Parasuchus hislopi Lydekker,
1885 (ISI R42) is re-evaluated and compared with the type material of
other basal phytosaurs. Parasuchus hislopi is extremely similar to
species previously placed in Paleorhinus (P. bransoni and P.
angustifrons), sharing with them such characters as a series of nodes
on the lateral surface of the jugal, paired ridges on the squamosal
and a frontal depression. Parasuchus hislopi represents a valid
species: it can be distinguished from P. bransoni by a relatively low
narial eminence and P. angustifrons by the absence of paired nasal
depressions. Inclusion of Parasuchus hislopi in a phylogenetic
analysis of phytosaurs recovers it in a well-supported clade with P.
bransoni and P. angustifrons. Parasuchus is considered the senior
synonym of Paleorhinus and Arganarhinus. Parasuchus (here considered
to include P. hislopi, P. angustifrons, P. bransoni and P. magnoculus)
has a broad circum-Pangaean distribution, with species occurring in
the south-western United States, Morocco, central Europe and India.
Phytosaur higher-level taxonomy is also revised: Parasuchidae is
redefined to include ‘Paleorhinus-grade’ phytosaurs and the
later-diverging Mystriosuchinae (the group formerly known as
Phytosauridae), and Pseudopalatinae is renamed Mystriosuchini for
reason of priority.