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Skenidioides pyramidalis
Taxonomy
Orthis pyramidalis was named by Twenhofel (1928). Its type specimen is YPM 10419, a shell, and it is a 3D body fossil.
It was recombined as Skenidium pyramidalis by Hall (1860); it was recombined as Skenidioides pyramidalis by Schuchert and Cooper (1932) and Sheehan (1976); it was recombined as Hesperorthis pyramidalis by Macomber (1970), Jin and Zhan (2008), Rasmussen (2013) and Jin and Blodgett (2020).
It was recombined as Skenidium pyramidalis by Hall (1860); it was recombined as Skenidioides pyramidalis by Schuchert and Cooper (1932) and Sheehan (1976); it was recombined as Hesperorthis pyramidalis by Macomber (1970), Jin and Zhan (2008), Rasmussen (2013) and Jin and Blodgett (2020).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Skenidium pyramidalis Hall p. 70 |
| 1928 | Orthis pyramidalis Twenhofel p. 174 figs. pl. 15, figs. 4–6 |
| 1932 | Skenidioides pyramidalis Schuchert and Cooper p. 72 |
| 1970 | Hesperorthis pyramidalis Macomber p. 427 figs. pl. 75, figs 1–7 |
| 1976 | Skenidioides pyramidalis Sheehan p. 714 figs. Pl. 1, figs. 1-12 |
| 2008 | Hesperorthis pyramidalis Jin and Zhan p. 11 figs. pl. 1, figs. 1–19 |
| 2013 | Hesperorthis pyramidalis Rasmussen pp. 371 - 372 fig. 8O–V |
| 2020 | Hesperorthis pyramidalis Jin and Blodgett pp. 640 - 642 fig. 3.1–3.12 |
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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.
†Skenidioides pyramidalis Twenhofel 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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. |