Microcheilinella sp.

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 : 44

Microcheilinella sp. 15 in Zazzali et al. 2015

Fig. 11M

Microcheilinella sp. 15 – Zazzali et al. 2015: fig. 12m.

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. F63466 • 1 complete carapace, 3 left valves; same locality as for preceding but samples 4 (GM5) and 2 (GM6); Capitanian, Middle Permian; MNHN.F. F63471 .

Occurrence

Chaotian section, Sichuan, China, Wuchiapingian, Late Permian ( Zazzali et al. 2015); samples 4 (GM5) and 2 (GM6), MKCS 1 section, ‘McKittrick Canyon’ Member, Bell Canyon Formation, Guadalupe Mountains, West Texas, USA, Capitanian, Middle Permian (this work).

Remarks

The carapace of this species is subtriangular in lateral view, with large AB and strong overlap of LV on RV, hemi-circular furrows are visible on the medio-anterior and medio-posterior parts of the carapace in both valves.

Figures

Fig. 11 (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USA), except R and S from the late Capitanian, Middle Permian, Penglaitan section, Guangxi, South China (Zazzali 2016, unpublished PhD thesis). All specimens from A–Q are temporarily housed in the collections of the Muséum national d’histoire naturelle, Paris, France (MNHN), specimens R and S are housed in the collections of the Sorbonne University, Paris, France. A–B. Ceratobairdia cf. ventrocostata Wang, 1978. A. External view of a left valve, sample 4 (GM5) (MNHN.F.F63454). B. External view of a left valve, sample 2 (GM6) (MNHN.F.F63455). – C–G. Ceratobairdia pratti Forel sp. nov. C. Holotype, right lateral view of a carapace, sample GM1 (MNHN.F.F63456). D. Paratype, external view of a left valve, sample GM1 (MNHN.F.F63457). E. External view of a left valve, sample GM1 (MNHN.F.F63458). F. External view of a left valve, sample GM1 (MNHN.F.F63459). G. External view of a left valve, sample GM1 (MNHN.F.F63460). – H–I. Petasobairdia campbelli Chitnarin in Chitnarin et al., 2017. H. External view of a left valve, sample GM2 (MNHN.F.F63461). I. External view of a left valve, sample GM4 (MNHN.F.F63462). – J. Petasobairdia cf. bicornuta Chen in Chen & Shi, 1982, right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63463). – K. Petasobairdia? sp., external view of a right valve, sample 4 (GM5) (MNHN.F.F63464). – L. Microcheilinella postspinosa Chen, 1958, right lateral view of a carapace, sample 2 (GM6) (MNHN.F.F63465). – M. Microcheilinella sp. 15 in Zazzali et al. (2015), right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63466). – N–O. Microcheilinella sp. N. Right lateral view of a carapace, sample 2 (GM6) (MNHN.F.F63467). O. Right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63468). – P–Q. Denticupachydomella bellcanyonensis Forel sp. nov. P. Holotype, right lateral view of a carapace, sample 4 (GM5) (MNHN.F.F63469). Q. Paratype, external left of a right valve, sample 2 (GM6) (MNHN.F.F63470). – R–S. Microcheilinella sp. D in Zazzali (2016). R. Dorsal view of a carapace (P6M 3778). S. Right lateral view of a carapace (P6M 3779). Scale bars: 100 µm.