Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA Author Titus, A. L. D. Korn & Grand Staircase-Escalante National Monument, 669 S. Highway 89 A, Kanab, UT 84741, USA Author Korn, D. J. E. Harrell & Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, Author Harrell, J. E. L. L. Lambert & Noble Energy Inc., Houston, TX 77070, USA Author Lambert, L. L. Department of Geological Sciences, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA text Fossil Record 2015 2015-06-04 18 2 81 104 http://dx.doi.org/10.5194/fr-18-81-2015 journal article 298388 10.5194/fr-18-81-2015 49a593d2-44ce-420d-a608-8533ec6745ac 2193-0074 11585625 6C6A1411-F88F-45C2-BA4A-D97C4CD4B415 Uralyroceras n. gen. Type species: Pachylyroceras constrictum Ruzhencev and Bogoslovskaya, 1971 . Genus diagnosis: Representatives of the family Neoglyphioceratidae with subevolute to evolute conch, which becomes more evolute in the adult stage. 20–30 coarse spiral lines, growth lines, and shell constrictions nearly linear or with low ventral projection. Suture line with narrow external lobe, usually with slightly sinuous flanks. Included species: angustum : Pachylyroceras angustum Ruzhencev and Bogoslovskaya, 1971 , p. 246 ; South Urals. consequens : Pachylyroceras consequens Ruzhencev and Bogoslovskaya, 1971 , p. 245 ; South Urals. constrictum : Pachylyroceras constrictum Ruzhencev and Bogoslovskaya, 1971 , p. 247 ; South Urals. arquatum : Uralyroceras arquatum new species ; South Urals. (new name for Pachylyroceras cloudi in Ruzhencev and Bogoslovskaya, 1971 , p. 244). esini : Pachylyroceras esini Nikolaeva, 1994, p. 83 ; Darvaz ( Tajikistan ). ? hyatti : Neoglyphioceras hyatti Gordon, 1965 , p. 139 ; Texas . Discussion: Uralyroceras differs from Pachylyroceras in the course of the shell constrictions, which extend with a low and wide projection across the venter in the new genus but with a ventral sinus as in Pachylyroceras .