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Eocymatium

Gastropoda - Personidae

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).

Synonymy list
YearName and author
1988Eocymatium Beu p. 88
1995Eocymatium Pacaud and Le Renard
2002Eocymatium Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classGastropodaCuvier 1797
superorderHypsogastropoda(Ponder and Lindberg 1997)
infraorderLittorinimorphaGolikov and Starobogtov 1975
superfamilyTonnoidea(Suter 1913)
familyPersonidaeGray 1854
genusEocymatium

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
ReferenceDiagnosis
A. G. Beu 1988Teleoconch 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.