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Hesperorthis craigensis

Rhynchonellata - Orthida - Hesperorthidae

Taxonomy
Orthis calligramma craigensis was named by Reed (1917).

It was recombined as Hesperorthis craigensis by Williams (1962) and Candela and Harper (2014).

Synonymy list
YearName and author
1917Orthis calligramma craigensis Reed pp. 827 - 828 figs. Plate V, figs. 7-9
1962Hesperorthis craigensis Williams pp. 107 - 108 figs. Pl. IX, figs. 3, 4, 7-9, 16
2014Hesperorthis craigensis Candela and Harper pp. Supplement 1

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
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
genusHesperorthisSchuchert and Cooper 1931
speciescraigensis()

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 pedicle valve less than one-third as deep as long, brachial valve commonly slightly convex umbonaUy and faintly sulcate antero-medianly, over three-quarters as long as wide; ornamented by a variable number (most commonly 26-30) of narrowly rounded costae with a wave-length of over 0.5 mm. at 5 mm. antero-median of the dorsal umbo, ventral muscle-scar subcordate, about as long as wide and extending anteriorly for about one-third the length of the pedicle valve.