Kirkbyella (Berdanella) cf. quadrata Croneis & Gutke, 1939

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 : 19

Kirkbyella (Berdanella) cf. quadrata Croneis & Gutke, 1939

Fig. 6D

Material examined

USA • 1 right valve; Guadalupe Mountains , West Texas, ‘ McKittrick Canyon’ Member , Bell Canyon Formation , MKCS1 section, sample 4 (GM5); Capitanian, Middle Permian; MNHN.F. F63386 .

Remarks

This specimen could belong to a new species with regard to the ornamentation of the carapace that consists of small ridges on the anterior part and a reticulation on the posterior part. The general shape is similar to that of Kirkbyella (Berdanella) quadrata Croneis & Gutke, 1939 sensu Hoare & Mapes 2000 from the Mississippian of Arkansas ( Hoare & Mapes 2000) but in this species the reticulation is organised quite horizontally and here it is more oblique.

Occurrence

Sample 4 (GM5), MKCS1 section, ‘McKittrick Canyon’ Member, Bell Canyon Formation, Guadalupe Mountains, West Texas, USA, Capitanian, Middle Permian (this work).

Figures

Fig. 6 (next page). SEM micrographs of ostracods from the Middle Permian (Roadian, Quarry section, samples GM1, GM2, and GM4; 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–B. Aurikirkbya guadalupensis Crasquin sp. nov. A. Holotype, left lateral view of a carapace, sample GM2 (MNHN.F.F63383). B. Paratype, left lateral view of a carapace, sample GM1 (MNHN.F.F63384). – C, E. Aurikirkbya wordensis (Hamilton, 1942). C. External view of a left valve, sample 2 (GM6) (MNHN.F.F63385). E. External view of a left valve, sample GM4 (MNHN.F.F63387). – D. Kirkbyella (Berdanella) cf. quadrata Croneis & Gutke, 1939, external view of a right valve, sample 4 (GM5) (MNHN.F.F63386). – F–H. Roundyella lebaensis Krömmelbein, 1958. F. External view of a left valve, sample GM4 (MNHN.F.F63388). G. External view of a right valve, sample GM4 (MNHN.F.F63389). H. External view of a right valve, sample GM1 (MNHN.F.F63390). – I–L. Hollinella (Hollinella) williamsranchensis Crasquin sp. nov. I. Holotype, external view of a right valve, sample GM1 (MNHN.F.F63391).J. External view of a right valve, sample GM1 (MNHN.F.F63392). K. Paratype, external view of a left valve, sample GM1 (MNHN.F.F63393). L. External view of a left valve, sample GM4 (MNHN.F.F63394). – M. Glyptopleura sp., external view of a right valve, sample GM1 (MNHN.F.F63395). – N–P. Geisina culbersonensis Crasquin sp. nov. N. Holotype, external view of a right valve, sample GM1 (MNHN.F.F63396). O. Paratype, external view of a right valve, sample GM1 (MNHN.F.F63397). P. External view of a left valve, sample GM2 (MNHN.F.F63398). – Q–R. Miltonella cf. shupei Sohn, 1950. Q. External view of a left valve, sample 4 (GM5) (MNHN.F.F63399). R. External view of a left valve, sample 4 (GM5) (MNHN.F.F63400). Scale bars: 100 µm.