|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Hesperorthidae
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).
|Year||Name and author|
|1848||Orthis davidsoni pyramidalis deVerneuil p. 174 figs. pl. 15 f. 4–6|
|1928||Orthis davidsoni pyramidalis Twenhofel p. 174 figs. pl. 15 f. 4–6|
|1974||Hesperorthis davidsoni Bassett and Cocks|
|2008||Hesperorthis pyramidalis Jin and Zhan p. 11–12 figs. txt. f. 4–5; pl. 1 f. 1–19|
|2011||Hesperorthis davidsoni Rubel|
|2013||Hesperorthis pyramidalis Rasmussen pp. 371 - 372 figs. 8O-V|
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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.
|J. Jin and R. Zhan 2008||Shell 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.|