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Eocymatium
Taxonomy
Eocymatium was named by Beu (1988) [Sepkoski's age data: T Than T Eo-m-l Sepkoski's reference number: 909].
It was assigned to Ranellidae by Beu (1988); to Personidae by Pacaud and Le Renard (1995); and to Neotaenioglossa by Sepkoski (2002).
It was assigned to Ranellidae by Beu (1988); to Personidae by Pacaud and Le Renard (1995); and to Neotaenioglossa by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Eocymatium Beu p. 88 |
| 1995 | Eocymatium Pacaud and Le Renard |
| 2002 | Eocymatium Sepkoski |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. G. Beu 1988 | Teleoconch shape and sculpture much as in Cymatium (Ranularia) Schumacher, 1817, with only a terminal varix or in addition one earlier varix to left of aperture on last whorl; spire short; anterior canal long, narrow, deflected slightly dorsally and to the left. Whorls evenly inflated. Sculpture dominantly of prominent, narrow, flat-topped, spiral cords crossed by narrow-crested, widely spaced axial folds. Aperture subcircular, lips thickened ; inner edge bf outer lip prominently denticulate, uppermost nodule largest, constricting a shallow posterior sinus. Protoconch very small, low-turbiniform, slightly inclined to the axis of the teleoconch on most specimens, of 1.8 inflated whorls, with a relatively large, in-rolled apex; the first half-whorl is microscopically reticulate, merging imperceptibly into a succeeding whorl with about 20 very fine, well raised spiral threads, in turn gradually developing fine, very weak axial costellae (initially only below the upper suture) that become more prominent over the last quarter-whorl; demarcated only weakly from the teleoconch, by increase in spacing of axial riblets and the development of more prominent, more widely spaced spiral cords on the early teleoconch. |