Bairdia elcapitanensis Forel, 2021

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 : 29-30

publication ID

https://doi.org/ 10.5852/ejt.2021.770.1499

publication LSID

lsid:zoobank.org:pub:33F92DB8-3122-4F8E-995B-DBF260B3E390

DOI

https://doi.org/10.5281/zenodo.5536077

persistent identifier

https://treatment.plazi.org/id/4DDDDD5C-6D2B-45E5-8B59-427C19C96DD7

taxon LSID

lsid:zoobank.org:act:4DDDDD5C-6D2B-45E5-8B59-427C19C96DD7

treatment provided by

Felipe

scientific name

Bairdia elcapitanensis Forel
status

sp. nov.

Bairdia elcapitanensis Forel sp. nov.

urn:lsid:zoobank.org:act:4DDDDD5C-6D2B-45E5-8B59-427C19C96DD7

Figs 7P–R View Fig , 8A–B View Fig

Diagnosis

A species of Bairdia with asymmetric valves and with a strong overlap along DB; ADB concave at RV and dorsal margin uniformly convex; PD and AD angles laterally compressed at RV.

Etymology

In reference to the El Capitan Peak located within the Guadalupe Mountains National Park, Guadalupe Mountains, West Texas, USA.

Material examined

Holotype USA • right valve, ( Fig. 8B View Fig ); Guadalupe Mountains , West Texas, Williams Ranch Member , Cutoff Formation , Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63420 View Materials .

Paratype USA • 1 right valve, ( Fig. 7R View Fig ); Guadalupe Mountains , West Texas, Williams Ranch Member , Cutoff Formation , Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63418 View Materials .

Additional material

USA • 1 complete carapace; Guadalupe Mountains , West Texas, Williams Ranch Member , Cutoff Formation, Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63416 View Materials 1 carapace; same locality as for preceding; Roadian, Middle Permian; MNHN.F. F63417 View Materials 1 right valve; same locality as for preceding; Roadian, Middle Permian; MNHN.F.F634119 16 right valves; same locality as for preceding but samples GM1, GM2; Roadian, Middle Permian; MNHN.F. F63491 View Materials .

Dimensions

L= 1250–1386 µm; H =635–761 µm.

Description

Carapace sub-triangular in lateral view with asymmetric valves and overlap of LV all around RV with maximum along DB; lateral surface smooth.

LV: Hmax around mid-L; dorsal margin uniformly convex with PDB and ADB almost straight; AB with small radius of curvature located above mid-H; VB straight to only gently concave; PB narrow with maximum of convexity located very ventrally.

RV: Hmax located at AD angulation; DB long and straight, gently bent posteriorly; PDB straight with terminal concavity; ADB concave; PD angle (130–135°) and AD angle (135–140°) laterally compressed; AB with relatively small radius of curvature, located above mid-H; oral concavity in front of mid-L at ventral margin; PB slighted.

Occurrence

Samples GM1 and GM2, Quarry section, Williams Ranch Member, Cutoff Formation, Guadalupe Mountains, West Texas, USA, Roadian, Middle Permian (this work).

Remarks

Bairdia girtyi Sohn, 1960 sensu Hoare & Merrill, 2004 from the Pennsylvanian of Texas ( Hoare & Merrill 2004) is similar to Bairdia elcapitanensis sp. nov. by its lateral morphology, but lacks the AD and PD angulations at RV. It is worth noting that the specimens of Hoare & Merrill (2004) do not belong to Bairdia girtyi Sohn, 1960 from the Late Mississippian of USA ( Sohn 1960), because Bairdia girtyi is more elongate, with PB located higher and Hmax located slightly behind mid-H.

Kingdom

Animalia

Phylum

Arthropoda

Class

Ostracoda

SubClass

Podocopa

Order

Podocopida

SuperFamily

Bairdioidea

Family

Bairdiidae

Genus

Bairdia

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