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Sowerbyella curdsvillensis
Taxonomy
Plectambonites curdsvillensis was named by Foerste (1912).
It was recombined as Sowerbyella curdsvillensis by Cooper (1956), Howe (1979) and Titus (1992).
It was recombined as Sowerbyella curdsvillensis by Cooper (1956), Howe (1979) and Titus (1992).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1912 | Plectambonites curdsvillensis Foerste p. 122 figs. pl. 10 f. 15A, B |
| 1917 | Plectambonites punctostriatus Mather p. 38 figs. pl. 1, figs. 15-17. |
| 1956 | Sowerbyella curdsvillensis Cooper pp. 780 - 781 figs. pl. 201A f. 1-13 |
| 1956 | Sowerbyella punctostriata Cooper p. 780 figs. pl. 201A, figs. 1-13 |
| 1972 | Sowerbyella punctostriata Howe p. 442 figs. pl. 1, fig. 12 |
| 1979 | Sowerbyella curdsvillensis Howe pp. C1-C2 figs. Plate 1, figures 6-16 |
| 1992 | Sowerbyella curdsvillensis Titus pp. 769 - 770 figs. 4, 6 |
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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.
†Sowerbyella curdsvillensis Foerste 1912
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Invalid names: Sowerbyella punctostriata Mather 1917 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. J. Howe 1979 | Shell large for the genus; width nearly twice the length; cardinal extremities acute to right-angular; anterior margin broadly rounded. Ornamentation unevenly costellate and faintly beaded; one to five finer costellae grouped between slightly larger ones. Region adjacent to posterior margin displaying weak oblique wrinkles in occasional specimens.
Pedicle valve moderat.ely convex in lateral profile; umbonal region gently inflated. Interior of pedicle valve finely papillose. Teeth small. Adjustordiductor muscle field wide, extending to about midlength; diductors strongly diverging in front of short median septum; paired adductor scars deeply incised into callus deposits of delthyrial floor. Brachial valve concave in lateral profile. Inner surface marked by fine papillose elevations. Adductor muscle field large, ·subcircular in outline, reaching beyond the middle of the valve; inner scars bordered by moderately elevated septa; occasional specimens displaying low median septum. Brachiophores large, strongly divergent, and ending in points; cardinal process strongly elevated ventrally. Interarea short, anacline. |