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Zhanorthis

Rhynchonellata - Orthida - Hesperonomiidae

Taxonomy
Zhanorthis was named by Popov and Cocks (2017). Its type is Zhanorthis gerdkuhensis.

It was assigned to Hesperonomiidae by Popov and Cocks (2017).

Species
Z. gerdkuhensis (type species)

Synonymy list
YearName and author
2017Zhanorthis Popov and Cocks pp. 8 - 9

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
RankNameAuthor
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyHesperonomiidaeUlrich and Cooper 1936
genusZhanorthis

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.

G. †Zhanorthis Popov and Cocks 2017
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†Zhanorthis gerdkuhensis Popov and Cocks 2017
Diagnosis
ReferenceDiagnosis
L. E. Popov and L. R. M. Cocks 2017Shell dorsibiconvex, slightly transverse, subrectangular, with obtuse to almost rectangular cardinal extremities and gently unisulcate anterior commissure. Ventral valve subcarinate posteriorly with a prominent, gently curved interarea and narrow open triangular delthyrium. Dorsal valve very gently convex with a planar, anacline interarea and shallow sulcus originating at the umbo. Radial ornament ramicostellate. Ventral interior with strong, simple teeth supported by short, divergent dental plates. Suboval muscle field on pseudospondylium extending beyond the delthyrial cavity and supported anteriorly by a short median ridge. The umbonal area occupied by a small pedicle callist. Ventral mantle canals saccate with closely placed, subparallel vascula media. Dorsal interior with a simple, ridge-like cardinal supported anteriorly by the thickened shaft, Notothyrial platform low, subtrinagilar with a pair of prominent notothyrial ridges. Brachiophores blade-like, defining elongate sockets. Dorsal adductor muscle quadripartite, bisected by a low median ridge.