Clostophis incurvus Páll-Gergely & Vermeulen, 2020

Páll-Gergely, Barna, Hunyadi, András, Grego, Jozef, Reischütz, Alexander, Buczkó, Krisztina & Vermeulen, Jaap J., 2020, Clostophis Benson, 1860, is not a monotypic diplommatinid but a speciose hypselostomatid (Gastropoda: Eupulmonata), with descriptions of six new species, Raffles Bulletin of Zoology 68, pp. 350-368 : 352-358

publication ID

https://doi.org/ 10.26107/RBZ-2020-0052

publication LSID

lsid:zoobank.org:pub:C7D4631B-9B02-4E6E-9665-76CCFECA86A0

persistent identifier

https://treatment.plazi.org/id/9565D05F-FFCF-FFC5-FCDA-5934FD789B99

treatment provided by

Carolina

scientific name

Clostophis incurvus Páll-Gergely & Vermeulen
status

sp. nov.

Clostophis incurvus Páll-Gergely & Vermeulen View in CoL , new species

( Fig. 4 View Fig )

Type material. Holotype (SH: 1.25 mm, SW: 1.08 mm) ( NHMUK 20191125 About NHMUK ; original inv. number: JJV 6263 ), Vietnam, Quang Ninh Province, Halong Bay area, Dao Bo Hon, Song Sot Cave , 20°50.833′N, 107°5.667′E, drift material washed together over sinkhole in cave, coll. Vermeulen, J.J. & Whitten, A.J., 02 October 1998. GoogleMaps

Diagnosis. A convexly conical Clostophis species with strong spiral striae, a well-developed parietal and a blunt palatal tooth.

Description. Shell triangular, convex, widest at its base. Whorls regularly increasing, bluntly shouldered. Protoconch consisting of ca. 1.5 whorls, no notable sculpture visible. Entire shell consisting of nearly five whorls, with fine, irregular radial growth lines and stronger, dense, equidistant spiral striae. Body whorl with ca. 17 spiral striae from apertural view. Umbilicus relatively narrow, occupies less than one third of the width. Aperture slightly oblique to shell axis, subcircular with blunt sinulus area. Parietal callus rather sharp, not smeared to penultimate whorl. Peristome relatively strongly thickened and expanded, not reflected. Parietal tooth moderately elevated, situated close to parietal callus. Parietal wall with a low, blunt, but strong tooth.

Differential diagnosis. Clostophis stochi has a weaker and denser spiral striation, a narrower umbilicus, and more rounded whorls. Clostophis multiformis , new species, possesses no or a weaker palatal tooth and a lower parietal tooth. See also under C. koilobasis , new species.

Etymology. The specific epithet means bent, curved in Latin, and refers to the last whorl, which is curved inwards in relation to the penultimate whorl.

Remarks. Although only a single shell is available, its shell characters clearly indicate that it differs from all congeners.

However, future efforts should focus on collecting more shells in order to reveal the intraspecific variability.

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