Kirkbyidae, Ulrich & Bassler, 1906

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 : 13

Kirkbyidae gen. et sp. indet.

Fig. 4J

Material examined

USA • 1 complete carapace; Guadalupe Mountains , West Texas, ‘ McKittrick Canyon’ Member , Bell Canyon Formation , MKCS1 section, sample 4 (GM5); Capitanian, Middle Permian; MNHN.F. F63374 .

Remarks

This specimen shows a clear oval kirkbyan pit in the middle part of the valve. The right valve has PB and AB with a different radius of curvature, whereas they are quite equivalent in Kirkbyidae . Herein, the PB has a very small radius of curvature and AB a large one. The ornamentation is coarse.

Occurrence

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

Figures

Fig. 4 (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 sample 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–C. Healdia mckittrickensis Crasquin sp. nov. A. Holotype, right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63365). B. Paratype, right lateral view of a carapace, sample GM1 (MNHN.F.F63366). C. External view of a right valve, sample 4 (GM5) (MNHN.F.F63367). – D–F. Healdia cutoffella Crasquin sp. nov. D. Holotype, right lateral view of a carapace, sample GM4 (MNHN.F.F63368). E. Paratype, external view of a left valve, sample GM1 (MNHN.F.F63369). F. External view of a left valve, sample GM4 (MNHN.F.F63370). –G–I. Sulcella mesopermiana Kozur, 1991.G. External view of a left valve, sample GM1 (MNHN.F.F63371). H. Left lateral view of a carapace, sample 2 (GM6) (MNHN.F.F63372). I. External view of a left valve, sample GM2 (MNHN.F.F63373). – J. Kirkbyidae gen. et sp. indet., right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63374). – K–L. Amphissites centronotus (Ulrich & Bassler, 1906).K. External view of a right valve, sample GM1 (MNHN.F.F63375).L. External view of a right valve, sample GM1 (MNHN.F.F63376). – M. Polytylites? sp., external view of a left valve, sample GM4 (MNHN.F.F63377). – N. Kindlella fissiloba Sohn, 1954, external view of a right valve, sample GM1 (MNHN.F.F63378). – O. Kindlella sp., external view of a left valve, sample GM1 (MNHN.F.F63379). – P–Q. Kindlella bellsundi Olempska & Błaszyk, 1996. P. External view of a right valve, sample 4 (GM5) (MNHN.F.F63380). Q. External view of a right valve, sample 4 (GM5) (MNHN.F.F63381) – R. Kirkbya sp., external view of a right valve, sample GM1 (MNHN.F.F63382). Scale bars: 100 µm.