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Ptychopleurella uniplicata

Rhynchonellata - Orthida - Hesperorthidae

Taxonomy
Ptychopleurella uniplicata was named by Cooper (1956).

Sister species lacking formal opinion data
P. cymbella

Synonymy list
YearName and author
1956Ptychopleurella uniplicata Cooper p. 391 figs. pl. 49F F41–44
2012Ptychopleurella uniplicata Rasmussen et al. pp. 42 - 43 figs. Plate 10, figures 22–24; Plate 11, figures 1–3

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyHesperorthidaeSchuchert and Cooper 1931
genusPtychopleurellaSchuchert and Cooper 1931
speciesuniplicataCooper 1956

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

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Diagnosis
ReferenceDiagnosis
C. M. O. Rasmussen et al. 2012Shell small to medium-sized; ventribiconvex profile; transversely semi-rectangular outline. Cardinal angles obtuse; maximum width onethird to half of valve length from posterior margin; anterior commissure rectimarginate to weakly unisulcate. Ventral valve strongly convex, subpyramidal; specimens with weak sulcus have a weak bilobed outline. Interarea high and catacline, straight; delthyrium high and very narrow. Dorsal valve weakly convex, with deeper sulcus at the anterior margin; interarea relatively high, wide and strongly anacline; notothyrium open, large and wide. Ornamentation consists of 11–13 coarse, simple costae that are interrupted by a strong lamellose concentric ornamentation; ornament of 5 costae in the ventral sulcus.

Ventral interior with large teeth supported by relatively large dental plates that fuse with valve floor to form a strong callus containing bilobed diductor muscle scar impressions. Anterior of the callus, the median is elevated as a result of a small depression in the ventral valve in some specimens. Dorsal interior with small blade-like cardinal process. Dental sockets large and deep; brachiophores long, stout and moderately divergent. Notothyrial platform elevated; thick dorsal median septum extends anteriorly to commissure.