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Hesperorthis davidsoni

Rhynchonellata - Orthida - Hesperorthidae

Taxonomy
Orthis davidsoni pyramidalis was named by deVerneuil (1848) [According to Rasmussen (2013): = 1928 Orthis tricenaria Conrad; Troedsson, p. 83 pl. 20 f. 5–8.]. Its type specimen is YPM 10419, a shell, and it is a 3D body fossil.

It was recombined as Hesperorthis davidsoni by Bassett and Cocks (1974) and Rubel (2011); it was recombined as Hesperorthis pyramidalis by Jin and Zhan (2008) and Rasmussen (2013).

Synonymy list
YearName and author
1848Orthis davidsoni pyramidalis deVerneuil p. 174 figs. pl. 15 f. 4–6
1928Orthis davidsoni pyramidalis Twenhofel p. 174 figs. pl. 15 f. 4–6
1974Hesperorthis davidsoni Bassett and Cocks
2008Hesperorthis pyramidalis Jin and Zhan p. 11–12 figs. txt. f. 4–5; pl. 1 f. 1–19
2011Hesperorthis davidsoni Rubel
2013Hesperorthis pyramidalis Rasmussen pp. 371 - 372 figs. 8O-V

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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
speciesdavidsoni(deVerneuil 1848)

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
J. Jin and R. Zhan 2008Shell medium-sized, subsemicircular in outline (Fig. 4), planoconvex to strongly ventribiconvex; hingeline equal to, or slightly shorter than, maximum shell width; anterior commissure rectimarginate. Costae coarse, rounded, simple or with rare bifurcation or intercalation near umbonal area, averaging 30 per valve; 1–3 strong capillae present in each interspace, especially near peripheral part of shell; growth lines regularly spaced, 9–11 per mm; growth lamellae very sparse, irregularly developed.