Middle Permian ostracods (Crustacea) from the Guadalupe Mountains, West Texas, USA Author Tarnac, Anaëlle D9FF2E72-B3F0-4EC7-ADC2-3F04D27E7E1E Centre de Recherches en Paléontologie - Paris, MNHN - SU - CNRS, 8 rue Buffon, 75005 Paris, France. tarnac.anaelle@gmail.com Author Forel, Marie-Béatrice 063C1F7E-6D26-48F9-A8B1-2AFA496B5FB8 Centre de Recherches en Paléontologie - Paris, MNHN - SU - CNRS, 8 rue Buffon, 75005 Paris, France. marie-beatrice.forel@mnhn.fr Author Nestell, Galina 4343960A-89AF-47A7-8418-6B715A7ED791 Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA. gnestell@uta.edu Author Nestell, Merlynd 544B3992-191B-4427-B1F7-7A19A9CBCB63 Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA. nestell@uta.edu Author Crasquin, Sylvie 6FDDD550-8522-404D-B3A2-D30BFAA86927 Centre de Recherches en Paléontologie - Paris, MNHN - SU - CNRS, 8 rue Buffon, 75005 Paris, France. sylvie.crasquin@mnhn.fr text European Journal of Taxonomy 2021 2021-09-22 770 1 60 http://dx.doi.org/10.5852/ejt.2021.770.1499 journal article 4088 10.5852/ejt.2021.770.1499 003a15e3-4b3f-423c-b40b-7f08fa1b1a75 2118-9773 5536263 33F92DB8-3122-4F8E-995B-DBF260B3E390 Ceratobairdia pratti Forel sp. nov. urn:lsid:zoobank.org:act: 97132C11-D593-4D25-AFA4-05B453873EA4 Figs 5G , 11C–G Diagnosis A species of Ceratobairdia with a nodular dorsal blade at LV displaying 6 very small triangular nodules?, AB and PB prolonged by short horizontal spines, posterior end reduced. Etymology Named after the geologist Wallace Pratt who donated a part of the McKittrick Canyon which became part of the Guadalupe Mountains National Park, Guadalupe Mountains, West Texas , USA . Material examined Holotype USA • complete carapace ( Fig. 11C ); Guadalupe Mountains , West Texas , Williams Ranch Member , Cutoff Formation , Quarry section, sample GM1; Roadian , Middle Permian ; MNHN.F. F63456 . Paratype USA • 1 left valve , ( Fig. 11D ); Guadalupe Mountains , West Texas , Williams Ranch Member , Cutoff Formation , Quarry section, sample GM1; Roadian , Middle Permian ; MNHN.F. F63457 . Additional material USA • 1 left valve ; Guadalupe Mountains , West Texas , Williams Ranch Member , Cutoff Formation , Quarry section, sample GM1; Roadian , Middle Permian ; MNHN.F. F63458 • 1 left valve ; same locality as for preceding; Roadian , Middle Permian ; MNHN.F. F63459 • 1 left valve ; same locality as for preceding; Roadian , Middle Permian ; MNHN.F. F63460 • 43 left valves ; Guadalupe Mountains , West Texas , Williams Ranch Member , Cutoff Formation , Quarry section, samples GM1, GM2; Roadian , Middle Permian ; MNHN.F. F63499 . Dimensions L= 981–1317 µm; H =607–846 µm ( Fig. 5G , only complete left valves measured, not considering spines). Description Sub-rectangular in lateral outline with Hmax around mid-L and Lmax around mid-H; dorsal margin uniformly convex with ADB straight and short; strong overlap of LV on RV along entire dorsal margin, much narrower along venter; PB steep, short and concave; dorsal margin transformed into nodular blade with 6 small triangular nodules; AB large with maximum of curvature around upper ⅓ rd and AVB plump, very convex; ventral margin straightly to slightly concave around mid-L; PB reduced, relatively large with maximum of curvature around mid-H; AB and PB slightly compressed laterally, prolonged by thick, short horizontal spines; surface smooth. Occurrence Samples GM1, GM2, Quarry section, Williams Ranch Member, Cutoff Formation, Guadalupe Mountains, West Texas , USA , Roadian, Middle Permian (this work). Remarks Ceratobairdia pratti sp. nov. is unique among species of Ceratobairdia known to date by the disposition of nodules along a nodular blade at LV and by the spines terminating AB and PB.