Libumella cf. athabascensis Green, 1963

Tarnac, Anaëlle, Forel, Marie-Béatrice, Nestell, Galina, Nestell, Merlynd & Crasquin, Sylvie, 2021, Middle Permian ostracods (Crustacea) from the Guadalupe Mountains, West Texas, USA, European Journal of Taxonomy 770, pp. 1-60 : 23-24

Libumella cf. athabascensis Green, 1963

Fig. 7A

Material examined

USA • 1 complete carapace; Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63401 .

Occurrence

Sample GM1, Quarry section, Williams Ranch Member, Cutoff Formation, Guadalupe Mountains, West Texas, USA, Roadian, Middle Permian (this work).

Remarks

The specimen is similar to Libumella athabascensis Green, 1963 from the Mississippian of the Rocky Mountains, Canada ( Green 1963; Crasquin 1985) and from the Late Permian of South China ( Yuan et al. 2007). Nevertheless, it differs by the presence of a nodule in the dorso-median part of the carapace.

Figures

Fig. 7 (next page). SEM micrographs of ostracods from the Middle Permian (Roadian, Quarry section, samples GM1 and GM2; Capitanian, MKCS1 section, samples 4 (GM5) and 2 (GM6)) of the Guadalupe Mountains (West Texas, USA). All specimens are temporarily housed in the collections of the Muséum national d’histoire naturelle, Paris, France (MNHN). A. Libumella cf. athabascensis Green, 1963, left lateral view of a carapace, sample GM1 (MNHN.F.F63401). – B. Fellerites? sp., external view of a right valve, sample GM1 (MNHN.F.F63402). – C. Paraparchites texanus Delo, 1930, right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63403). – D–H. Paraparchites pecosensis Crasquin sp. nov. D. Holotype, right lateral view of a carapace, sample GM1 (MNHN.F.F63404). E. Right lateral view of a carapace, sample GM1 (MNHN.F.F63405). F. External view of a right valve, sample 2 (GM6) (MNHN.F.F63406). G. External view of a right valve, sample GM1 (MNHN.F.F63407). H. Paratype, left lateral view of a carapace, sample GM1 (MNHN.F.F63408). – I. Acratia sp., right lateral view of a carapace, sample GM2 (MNHN.F.F63409). – J. Acratia cf. sinuata (Kozur, 1991), external view of a left valve, sample GM1 (MNHN.F.F63410). – K. Acratia sinuata (Kozur, 1991), external view of a left valve, sample GM1 (MNHN.F.F63411). – L–M. Bairdia radlerae Kellett, 1934. L. External view of a left valve, sample GM1 (MNHN.F.F63412). M. Right lateral view of a carapace, sample GM1 (MNHN.F.F63413). – N. Bairdia rhomboidalis Hamilton, 1942, right lateral view of a carapace, sample 2 (GM6) (MNHN.F.F63414). – O. Bairdia subfusiformis Hamilton, 1942, external view of a left valve, sample GM1 (MNHN.F.F63415). – P–R. Bairdia elcapitanensis Forel sp. nov. P. Right lateral view of a carapace, sample GM1 (MNHN.F.F63416). Q. Right lateral view of a carapace, sample GM1 (MNHN.F.F63417). R. Paratype, external view of a right valve, sample GM1 (MNHN.F.F63418). Scale bars: 100 µm.