Relationships of the Indian phytosaur Parasuchus hislopi Lydekker, 1885

Christian Kammerer, Richard Butler, Saswati Bandyopadhyay, Michelle Stocker

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Abstract

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 southwestern 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.
Original languageEnglish
Pages (from-to)1-23
JournalPapers in Palaeontology
Volume2
Issue number1
Early online date28 Jul 2015
DOIs
Publication statusPublished - Feb 2016

Keywords

  • Phytosauria
  • Triassic
  • India
  • biogeography
  • phylogeny

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