Clithon barbei
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Ordo: Cycloneritimorpha
Familia: Neritidae
Genus: Clithon
Name
Clithon barbei Symonds, Malcolm Francis, 2010 – Wikispecies link – Pensoft Profile
- Clithon barbei Symonds, Malcolm Francis, 2010, Zootaxa 2606: 59-60.
Materials Examined
Type material.Holotype NHM PI TG 26448 (M. Symonds coll., Fig. 3 a–c). One paratype NHM PI TG 26449 (M. Symonds coll.), one paratype MNHN A 33473 (Ledon coll.). All from type locality. Stratum typicum. Early Eocene, Ypresian (Sparnacian), “Sands of Pourcy”. Locus typicus. Pourcy, Marne, France. 49 ˚09ˏ 43 ˝ N 3 ˚ 54 ˏ 21 ˝ E.
Etymology
Derivatio nominis. Named after Gérard Barbe of Champillon, Marne, France, a palaeontologist, who is familiar with the fossils of Pourcy, and who assisted the senior author with the collection of material from there, in which the types of this taxon were found.
Diagnosis
Diagnosis. A small semiglobose Pictoneritina; spire depressed, septum with poorly defined teeth, colour pattern of three dark spiral bands on light background.
Description
Description. Shell small for subgenus, consisting of about 2.25 whorls, semiglobose with spire depressed. Protoconch small, approximately 0.2 mm wide, smooth, almost spherical. Teleoconch about 2.25 whorls, evenly convex, increasing rapidly in size; surface glossy, smooth. Suture sharp, well defined. Colour pattern of 3 dark spiral bands on light background, highest immediately below suture, varying in width but usually narrower than spaces between them. Aperture oblique, semicircular. Septum convex, smooth. Septum edge slightly concave in centre; teeth consist of one rather broad, rounded, indistinct tooth at about one third of distance from adapical end of septum, 1 to 3 denticulations abapical to it, also indistinct. Outer lip evenly rounded, thin, smooth within. Apertural tooth low, curved ridge below abapical end of septum. Size.Holotype: height 3.2 mm, width 3.2 mm.
Discussion
Remarks.Clithon (P.) barbei is similar in size and shape to Clithon (P.) nucleus Deshayes, 1825 from the Cuisian of Cuise-la-Motte, Oise, France, although in that species the spire is usually wholly or partially covered by the following whorl. The colour pattern in C. (P.) nucleus consists of dark, wavy, transverse lines on a light background, in some specimens the transverse lines are interrupted by two or three pale spiral bands, while C. (P.) barbei has a colour pattern of 3 dark spiral bands on a light background. Range and distribution. Only known from type locality.
Taxon Treatment
- Symonds, Malcolm Francis; Pacaud, Jean-Michel; 2010: New species of Neritidae (Neritimorpha) from the Ypresian and Bartonian of the Paris and Basse-Loire Basins, France, Zootaxa 2606: 59-60. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
