Areas filled with parallel lines are broken surfaces. Light grey areas represent recessed areas of bone (tympanic cavity), articulation (mandibular and occipital), or denticles on palate. Dark grey areas represent openings or sediment-infilled fenestrae.

UFRGS-PV-0224-P, photographs (above) and interpretative drawing (below) in dorsal (A), posterior (B), and ventral (C) views. Scale bars = 5 cm.Īustralerpeton cosgriffi Barberena, 1998.

Abbreviations: cm, crista muscularis co, choana cp, cultriform process ec, ectopterygoid en, external naris ex, exoccipital fcr, falciform crest fr, frontal iv, interpterygoid vacuity jug, jugal la, lacrimal memb., ridge corresponding to the basal attachment of the medial membrane of the tympanic cavity ( sensu Watson, 1962) mx, maxilla na, nasal obc, oblique crest occ, occipital condyle orb, orbit pa, parietal pf, postfrontal pfe, post-temporal fenestra pl, palatine po, postorbital ppa, postparietal prf, prefrontal ps, parasphenoid pt, pterygoid qd, quadrate qj, quadratojugal sf, subtemporal fenestra sq, squamosal st, supratemporal tab, tabular tabh, tabular horn tcr, tympanic crest tyc, tympanic cavity vo, vomer vpj, ventral process of the jugal. Light grey areas represent recessed areas of bone (tympanic cavity), areas of articulation (mandibular and occipital), and denticles on palate. Dark grey areas represent openings or sediment- infilled fenestrae. Photographs (above) and interpretative drawing (below) in dorsal (A), posterior (B), and ventral (C) views. © 2015 The Linnean Society of LondonĪustralerpeton cosgriffi Barberena, 1998. Australerpeton cosgriffi is the only undisputed Rhinesuchidae record outside southern Africa and the first long-snouted Stereospondyli, and thus is useful in helping to understand the diversification of the stereospondyls during the Middle/Late Permian of Gondwana. A unique tympanic cavity formed by a well posteroventrally projected tabular horn, stapedial groove, well-developed oblique crest on the pterygoid, and a dorsal pterygoid crest (new term) characterizes the ear region of Rhinesuchidae. The results show Rhinesuchidae divided into Rhinesuchinae and Australerpetinae. cosgriffi was assessed using a new matrix of 221 characters of which 196 were selected from previous studies and the remaining are newly proposed. Based on the recovered information and new morphological data, the systematic position of Au.

Australerpeton cosgriffi is nested within Rhinesuchidae based on the anatomy of the tympanic cavity, but its long-snouted condition is unique amongst rhinesuchids. Here, we review the cranial anatomy of the species, providing a comparative redescription, new anatomical data and previously unrecognized characters. cosgriffi were recovered from the Middle-Late Permian deposits of the Rio do Rasto Formation (Paraná Basin), in the Serra do Cadeado area of Brazil. Australerpeton cosgriffi is a long-snouted representative of the group and one of the most complete temnospondyls known from the Permian of South America. Yet, the first stereospondyls appeared in the Middle–Late Permian of Gondwana, mostly represented by Rhinesuchidae. Stereospondyls are a diverse and morphologically distinctive clade of basal tetrapods that rapidly reached a global distribution and high abundance during the Early Triassic.

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