Healdia mckittrickensis Tarnac, Forel, Nestell, Nestell, and Crasquin 2021
- Dataset
- Middle Permian ostracods (Crustacea) from the Guadalupe Mountains, West Texas, USA
- Rank
- SPECIES
- Published in
- 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: 1-60, DOI: 10.5852/ejt.2021.770.1499, URL: http://dx.doi.org/10.5852/ejt.2021.770.1499
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Ostracoda
- order
- Podocopida
- family
- Healdiidae
- genus
- Healdia
- species
- Healdia mckittrickensis
description
Dimensions L = 224 – 807 µm; H = 139 – 489 µm. Description Carapace stocky, subtriangular to ovoid in lateral view; important overlap of RV by LV with maximum along PDB; dorsal margin of LV regularly arched with Hmax at posterior ⅓ of L; dorsal margin of RV with Hmax at mid-L; AB with maximum of convexity located slightly below Hmax; VB slightly concave at both valves; PB large and close to vertical; presence of two posterior spines quite large, their bases are linked by an intra-spines tenuous ridge; in front of the spines, presence of a curved ridge, more developed than the intra-spines one; surface smooth. Occurrence Samples GM 1, 4 (GM 5), Quarry section, Williams Ranch Member, Cutoff Formation, Roadian; MKCS 1 section, sample GM 5, ‘ McKittrick Canyon’ Member, Bell Canyon Formation, Capitanian; Middle Permian, Guadalupe Mountains, West Texas, USA (this work).
description
urn: lsid: zoobank. org: act: 2454 FD 9 D-BB 92 - 4 D 01 - BD 84 - 11011 B 2 DC 72 F Fig. 4 A – C
diagnosis
Diagnosis A species of Healdia with a stocky carapace, a massive overlap of LV on RV, thick posterior spines; a curved ridge extends in front of the spines.
discussion
Remarks Healdia mckittrickensis sp. nov. has an unique morphology. The general outline is reminiscent of Healdia subtrangula Kotschetkova, 1959 from the Kazanian (Roadian) of Bashkiria, SW of the Ural Mts (Kotschetkova 1959) but H. mckittrickensis sp. nov. has a less triangular lateral outline with thicker spines.
etymology
Etymology In reference to the ‘ McKittrick Canyon’ Member, Bell Canyon Formation, Guadalupe Mountains, West Texas, where this species has been discovered.
materials_examined
Material examined Holotype USA • complete carapace, (Fig. 4 A); Guadalupe Mountains, West Texas, ‘ McKittrick Canyon’ Member, Bell Canyon Formation, MKCS 1 section, sample GM 5; Capitanian, Middle Permian; MNHN. F. F 63365. Paratype USA • 1 incomplete carapace (DB and PVB of LV are missing), (Fig. 4 B); Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, sample GM 1; Roadian, Middle Permian; MNHN. F. F 63366. Additional material USA • 1 right valve; Guadalupe Mountains, West Texas, ‘ McKittrick Canyon’ Member, Bell Canyon Formation, MKCS 1 section, sample GM 5; Capitanian, Middle Permian; MNHN. F F 63367 • 3 complete carapaces; Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, samples GM 1, GM 4; Roadian, Middle Permian; MNHN. F. F 63473.