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 Goniatites de Haan, 1825 Type species: Conchiliolithus Nautilites ( sphaericus ) Martin, 1809 [nomen nudum], equal to Ammonites sphaericus Sowerby, 1814 (Opinion 420 ICZN , 1956). Diagnosis: Goniatitinae with subinvolute inner whorls; the umbilicus becomes closed in early ontogeny. External lobe usually V-shaped and rarely Y-shaped, very narrow or narrow, usually with slightly curved flanks. For the species composition of the genus and a discussion of the characteristics and limits, see Korn and Titus (2011) .