Australerpeton cosgriffi, BARBERENA, 1998

AUSTRALERPETON COSGRIFFI BARBERENA, 1998

Australerpeton cosgriffi Barberena, 1998: 126 , original description.

Holotype: UFRGS-PV-0227-P, the left half of a long-snouted skull missing approximately the anterior third of the rostrum (Fig. 12A–D).

Paratypes: UFRGS-PV-0228-P, an isolated long snout associated with some postcranial elements. UFRGS- PV-0229-P, an almost complete skull without the rostrum. UFRGS-PV-0230-P, the left corner of a skull. All specimens were collected from the Rio do Rasto Formation at Serra do Cadeado area, Estado do Paraná in southern Brazil (Barberena, 1998) .

Type locality and horizon: Serra do Cadeado area, Estado do Paraná, Brazil; Rio do Rasto Formation, Lopingian ( Holz et al., 2010).

Referred specimens: UFRGS-PV-0224-P, an almost complete skull with mandibles. UFRGS-PV-0225-P, a complete skull only missing the anterior half of the rostrum. UFRGS-PV-0226-P, an incomplete right hemimandible. UFRGS-PV-0240-P, an incomplete right hemimandible. UFRGS-PV-0243-P, an incomplete mandible. UFRGS- PV-0319-P, the posterior half of a skull table, associated with a mandibular fragment and a fairly complete and articulated postcranial skeleton. UFRGS-PV-0320-P, left posterior corner of a skull associated with a partially articulated and almost complete postcranial skeleton. UFRGS-PV-0320-P, portion of a right hemimandible. LPRP ⁄USP-0011, a left hemimandible associated with scattered postcranial bones. All the referred specimens are from the Rio do Rasto Formation at the Serra do Cadeado area, and collected in the Br-376 road cuts and the railway cuts between Apucarana and Ponta Grossa, Estado do Paraná in southern Brazil (Barberena, 1998; Dias & Richter, 2002; Dias & Schultz, 2003; Eltink & Langer, 2014; Eltink et al., 2016).

Remarks: The first described specimen was an isolated rostrum (UFRGS-PV-0228P) and preliminarily identified by Barberena and Daemon as being related to the archegosaurid Platyops sp. ( Barberena & Daemon, 1974: 253). Later Barberena (1998) described new skull material from the same area and erected the taxon A. cosgriffi to include all Serra do Caldeado specimens. A. cosgriffi was included in the new family Australerpetonidae within Rhinesuchoidea (Barberena, 1998). Subsequent reviews ( Werneburg & Schneider, 1996; Schoch & Milner, 2000) considered A. cosgriffi as an archegosaurid closely related to Platyoposaurus . Dias & Schultz (2003) described two almost complete skeletons with associated partial

Fi g u r e 1 2. UFRGS-PV-0 2 2 7-P, skull holotype of Australerpeton cosgriffi . (A, B) Dorsal view. (C, D) Ventral view. Scale bar equals 5 cm.

skull material and referred them to A. cosgriffi . They also agreed with Barberena to assign the species to Australerpetonidae . More recently, new material from the same locality was described and a new description of the skull, using all referred specimens, was presented ( Eltink & Langer, 2014; Eltink et al., 2016). Moreover, the status of A. cosgriffi is re-assessed as a Rhinesuchidae closely related to the Triassic South African rhinesuchid B. putterilli ( Eltink et al., 2016) .