Aurikirkbya guadalupensis Tarnac & Forel & Nestell & Nestell & Crasquin 2021, sp. nov.
Creators: name: Tarnac, Anaëlle
name: Forel, Marie-Béatrice
name: Nestell, Galina
name: Nestell, Merlynd
name: Crasquin, Sylvie
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Kirkbya
Kelletinidae
Aurikirkbya
Aurikirkbya guadalupensis

description: Aurikirkbya guadalupensis Crasquin sp. nov.
urn:lsid:zoobank.org:act: FD8EB2E1-3BDB-4A75-ADA2-4FB287EB27AA
Figs 5B, 6A–B
Diagnosis
A species of Aurikirkbya with an additional ventral ridge parallel to the adventral ridge, extending from mid-H in the anterior part to mid-H in the posterior part of the carapace.
Etymology
After the Guadalupe Mountains, West Texas, USA, where this species has been discovered.
Material examined
Holotype USA • complete carapace, (Fig. 6A); Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, sample GM2; Roadian, Middle Permian; MNHN.F. F63383.
Paratype USA • 1 complete carapace, (Fig. 6B); Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63384.
Additional material
USA • 8 valves; Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, samples GM1, GM2, and GM3; Roadian, Middle Permian; MNHN.F. F63478.
Dimensions
L= 829–1280 µm; H= 368–660 µm (Fig. 5B).
Description
Carapace sub-rectangular in lateral view with Hmax located in anterior half; Lmax located in dorsal part of Hmax; DB long and straight; posterior shoulder clearly expressed, ACA close to 90° or slightly obtuse; PCA close to 90° or slightly acute; AB with large radius of curvature with maximum located around mid-H; VB almost straight with weak median concavity, parallel to DB; PB with small radius of curvature and maximum located close to DB; 2 vertical lobes connected above kirkbyan pit by small sub-horizontal lobe; kirkbyan pit located at mid-L and below mid-H; two important ridges along free margins, one ventral and one adventral; marginal structure underlined by tubercles; adventral ridge smooth as well as areas around cardinal angles; additional ridge parallel to adventral one, extending from mid-H in anterior part up to mid-H in posterior part of the carapace; presence of a dorsal shield characteristic of the genus; surface reticulate.
Occurrence
Samples GM1, GM2, and GM3, Quarry section, Williams Ranch Member, Cutoff Formation, Guadalupe Mountains, West Texas, USA, Roadian, Middle Permian (this work).
Remarks
Aurikirkbya guadalupensis sp. nov. differs from the three species described by Sohn (1950) (A. wordensis (Hamilton, 1942), A. barbarae Sohn, 1950 and A. auriformis Sohn, 1950) from the Roadian (upper Leonardian or lower Wordian in the sense of Sohn 1950) of the Glass Mountains, Texas by a smaller PB and a diagnostic ridge. Aurikirkbya kelletae (Harlton, 1929) from the Pennsylvanian of Texas and Aurikirkbya miyakei Yanaka & Ono in Tanaka et al., 2012 from the Early Permian of Japan (Tanaka et al. 2012) have a similar carapace shape but differ by the diagnostic ridge.
description: Published as part of Tarnac, Anaëlle, Forel, Marie-Béatrice, Nestell, Galina, Nestell, Merlynd & Crasquin, Sylvie, 2021, Middle Permian ostracods (Crustacea) from the Guadalupe Mountains, West Texas, USA, pp. 1-60 in European Journal of Taxonomy 770 on pages 16-18, DOI: 10.5852/ejt.2021.770.1499, http://zenodo.org/record/5536263