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Idiospira cuneatella
Taxonomy
Rhynchonella cuneatella was named by Davidson (1883).
It was recombined as Camarella cuneatella by Reed (1917); it was recombined as Idiospira cuneatella by Williams (1962) and Candela and Harper (2014).
It was recombined as Camarella cuneatella by Reed (1917); it was recombined as Idiospira cuneatella by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1883 | Rhynchonella cuneatella Davidson p. 200 figs. pl. x, fig. 11 |
| 1917 | Camarella cuneatella Reed p. 926 figs. Plate XXII, figs. 25, 26 |
| 1962 | Idiospira cuneatella Williams pp. 249 - 250 figs. Pl. XXV, figs. 29, 30 |
| 2014 | Idiospira cuneatella Candela and Harper pp. Supplement 1 |
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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.
†Idiospira cuneatella Davidson 1883
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | In this shell the long sloping flattened shoulders with false areas and the general shape resemble Rhynch. ardmillanensis (see p. 941), but the folds are coarser, fewer, and only marginal; the beak of the pedicle-valve also seems lower. In DAVIDSON'S poor type-specimen from the Balclatchie conglomerate there are five plications on the brachial valve, and they do not curve outwards on each side as DAVIDSON incorrectly shows. In other specimens from the same locality (mounted and named by DAVIDSON with the type) there are 5 or 6 folds on the brachial valve, the 2 middle ones being usually rather larger and closer, and on the pediclevalve there are 3-4 on each side of the shallow narrow sinus. | |
| A. Williams 1962 | Biconvex Idiospira-like shells, acutely triangular outline accentuated by a truncated anterior margin, which is also slightly depressed ventrally and dorsally, and steep, nearly vertical sides with the pedicle valves slightly longer than wide; initially smooth, but beyond the 4-ram. growth-stage ornamented by 4, or rarely 6, sharp costae in the brachial valve, and 5 or 7 in the pedicle valve; dental lamellae long, slightly divergent, muscle-field with a lanceolate median adductor scar over one-third as long as the pedicle valve; hinge-plate divided, crural bases flaring, muscle-scar quadripartite, vascula media closely set and parallel, corresponding to the crests of the submedian costae. |