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Hesperorthis australis exitis

Rhynchonellata - Orthida - Hesperorthidae

Taxonomy
Hesperorthis australis exitis was named by Williams (1962) [figs. 18-20 are for Hesperorthis cf. australis exitis]. Its type specimen is BB.15201, a shell (complete shell), and it is a 3D body fossil.

Synonymy list
YearName and author
1962Hesperorthis australis exitis Williams p. 107 figs. Pl. IX, figs. 10-15, 17, 18-20

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
RankNameAuthor
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyHesperorthidaeSchuchert and Cooper 1931
genusHesperorthisSchuchert and Cooper 1931
speciesaustralis
subspeciesexitis

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.

Diagnosis
ReferenceDiagnosis
A. Williams 1962Subcircular, piano-convex Hesperorthis with a pedicle valve almost one-third as deep as long and a slightly sulcate brachial valve nearly four-fifths as long as wide; ornamentation consisting of 30-33, less commonly 28 or 29, narrowly rounded costae with a wave-length of just over 0.5 mm. at 5 mm. antero-medianly of the dorsal umbo, as well as fine parvicostellae in the interspaces and delicate concentric lamellae; ventral muscle-field subtriangular, almost three-quarters as wide as long and extending anteriorly for about one-third the length of the pedicle valve.