...RICHARD A. KISSEL; THOMAS M. LEHMAN Abstract A recently discovered tetrapod-bearing locality (OMNH V1005) in the Upper Pennsylvanian Ada Formation of Oklahoma has produced the remains of six taxa: the pelycosaurian-grade synapsid Ophiacodon cf. mirus , an indeterminate sphenacodontian pelycosaur...

... unit, the Halgaito tongue, in the vicinity of Mexican Hat. Forms referable or close to known Four Corners genera are: Xenacanthus aff. X. texensis, Eyrops sp., Platyhystrix cf. P. rugosus, Diadectes sp., a limnoscelid, Ophiacodon cf. O. navajovicus, and a sphenacodontid pelycosaur. Of 3 kinds...

... in one or more studies, and if one or more different studies use a single species of that genus, then the single species used is included in all source trees. For example, most studies use Ophiacodon spp. as a terminal taxon, but one uses Ophiacodon mirus . Here, therefore, O. mirus replaces...

... 1982 ), the ophiacodontid Ophiacodon mirus ( Williston and Case 1913 ; Romer and Price 1940 ), and the haptodontid Haptodus garnettensis ( Laurin 1993 ). Table 2. Distribution of the character states for taxa analyzed in this paper. Character...

... is not included in Table 1 . Based mainly upon postcranial material (some figured by Case, 1900 , 1907 ; Cope and Matthew, 1915 ; Romer and Price, 1940 ), Romer and Price ( 1940 ) regarded Clepsydrops as an ophiacodontid closer to Varanosaurus Broili, 1904 , than to Ophiacodon Marsh, 1878...

... ), ophiacodontids (e.g., Ophiacodon ; Romer and Price, 1940 ), and sphenacodontids (Romer, 1922 ; Romer and Price, 1940 ), and late Permian and Triassic therapsids, such as many dicynodonts (e.g., Cistecephalus , Dicynodontoides , Ischigualastia ; Cox, 1965 ; Cluver, 1978 ; Angielczyk et al., 2009 ), some...

... in Ophiacodon and Dimetrodon (Reptilia, Pelycosauria) from the Admiral and Lower Belle Plains formations of West Central Texas . Journal of Vertebrate Paleontology , 8 : 172 - 180 . Brochu , C. A. 1996 . Closure of neurocentral sutures during crocodilian ontogeny: implications for maturity...

...Fig. 5. Varanopid phylogeny and the fossil record. Ghost lineages are indicated by dashed lines. Cotylorhynchus and Eothyris have been selected as representatives of the caseasaurian families Caseidae and Eothyrididae, respectively; Archaeothyris and Ophiacodon have been selected...

..., including Archeothyris ( Reisz, 1972 ; Carroll, 1986 ) and Ophiacodon ( Romer and Price, 1940 ). Thus, in baphetids, Eoherpeton, and most embolomeres only the absence of the lateral sutures prevents the recognition of paired supraoccipitals as occur in L. dynatis. Perhaps the paired supraoccipitals...

... of the pelycosaur Ophiacodon sp., from the Coventry Sandstone of Warwick- shire, which equates to the Enville Formation of South Staffordshire, is considered to indicate a late Stephanian to early Autunian age (Paton 1974). The late Autunian age for the Enville Formation, based on amphibian and reptile footprints...

... – + – – – Labidosaurikos Stovall, 1950 + + + – – Synapsida ? Ophiacodon Marsh, 1878 – + – – – Dimetrodon Cope, 1878 + + + – – Varanops Williston, 1914 – – – – + ...