Abstract
Abstract. The early Permian karst system near Richards Spur, Oklahoma preserves a diverse assemblage of terrestrial dissorophoid temnospondyls. Here we report the presence of a large-bodied dissorophine dissorophid that is represented by an articulated anterior trunk region, including a partial pectoral girdle, a ribcage characterized by extremely developed uncinate processes, and a rare, completely articulated pes. This represents the first documentation of the clade at the locality. Previously, dissorophids were represented only by the eucacopine Cacops. A complete pelvic girdle with hindlimbs is also referred to Cacops and represents the first material of the posterior trunk region to be described from the genus at Richards Spur. These specimens expand the taxonomic diversity known from the site and provide significant, well-preserved postcranial material that improves the characterization of dissorophid postcranial anatomy.
Highlights
The early Permian karst deposits near Richards Spur, Oklahoma preserve a diverse array of terrestrial dissorophoid temnospondyls
The other to the subfamily Dissorophinae. The latter specimen represents the first report of a dissorophine at the Richards Spur locality, thereby expanding the known temnospondyl diversity at the locality, as previously, the dissorophids were represented only by eucacopines Cacops morrisi and C. woehri (Reisz et al, 2009; Fröbisch and Reisz, 2012)
Dissorophines, represented by several species of Broiliellus and Dissorophus multicinctus, are known almost exclusively from Texas – B. reiszi is known from New Mexico – and the first record of the clade at Richards Spur expands their biogeographic range
Summary
The early Permian karst deposits near Richards Spur, Oklahoma preserve a diverse array of terrestrial dissorophoid temnospondyls These include three amphibamids (Doleserpeton annectens, Pasawioops mayi, and Tersomius dolesensis), two dissorophids (Cacops morrisi and C. woehri), and one trematopid (Acheloma dunni) (Bolt, 1969; Fröbisch and Reisz, 2008, 2012; Reisz et al, 2009; Polley and Reisz, 2011; Anderson and Bolt, 2013). The thorough description of articulated postcrania of large-bodied dissorophids is important for augmenting the record and the understanding of dissorophoid postcrania
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