Coptocheilus maunautim, Bui & Páll-Gergely, 2020

Bui, Chinh Thi & Páll-Gergely, Barna, 2020, A new species of Coptocheilus Gould, 1862 (formerly Schistoloma Kobelt, 1902) from Vietnam (Caenogastropoda: Cyclophoroidea: Pupinidae), Raffles Bulletin of Zoology 68, pp. 448-451 : 449-451

publication ID

https://doi.org/ 10.26107/RBZ-2020-0061

publication LSID

lsid:zoobank.org:pub:A6D5A0AF-C338-4902-BEB7-A6D9DAE75AB5

persistent identifier

https://treatment.plazi.org/id/5D00E29D-8C20-4674-B786-6C79D1FD5C30

taxon LSID

lsid:zoobank.org:act:5D00E29D-8C20-4674-B786-6C79D1FD5C30

treatment provided by

Carolina (2021-03-03 14:15:24, last updated by Plazi 2023-11-01 22:39:26)

scientific name

Coptocheilus maunautim
status

sp. nov.

Coptocheilus maunautim View in CoL , new species

( Fig. 1A, C View Fig )

Material examined. Holotype (H: 21.7 mm, W: 9.2 mm) (MNHN-IM-2000-35697), Vietnam, Thua Thien- Hue Province, Nam Dong District , limestone mountain (16°06′56″N, 107°38′32″E, 220 m), coll. T. C. Bui, 10 June 2018 GoogleMaps . Paratypes: 1 ex. ( HNHM 104870 About HNHM ) , 1 ex. (coll. HA), 1 ex. ( VNMN _ IZ 000.000.178), 17 exx. ( LZ–HUE 5601 ), all same data as holotype, coll. T. C. Bui, N. T. N. Dang and N. T. Duong, 01 October 2017 and 10 June 2018; 2 exx. ( ZRC.MOL.16453), same data as holotype, coll. T. C. Bui, 10 June 2018; 7 exx. ( LZ–HUE 5602 ), Vietnam, Thua Thien-Hue Province, Nam Dong District , limestone mountain (16°08′16″N, 107°36′51″E, 270 m), coll. T. C. Bui and H.C. Nguyen, 07 July 2018 GoogleMaps .

Diagnosis. A middle-sized Coptocheilus species with a brownish purple shell colour, rather glossy, almost smooth shell surface, and a “double suture”.

Description. Shell high conical, widest around base, brownish purple (dead collected shells lighter); protoconch 2.75 whorls, smooth, glossy, orange to purple; teleoconch glossy, nearly smooth, with very fine growth lines; suture “double” (a “pseudosuture” visible as slight groove just below the suture), with a conspicuous pale subsutural band; outer lip slightly opisthocline; peristome continuous, expanded, very slightly reflected, especially at basal part; peristome slender, sharp in lateral view, boundary between inner and outer peristomes hardly visible; umbilicus open, slit-like, without periumbilical keel. Operculum unknown.

Measurements (mm). H: 19.2–23.3, W: 8.5–9.2, AH: 6.6–7.3, AW: 6.4–7.1 (n = 25).

Differential diagnosis. Coptocheilus maunautim , new species, differs from all congeners by its “double suture” (see comparison with C. messageri , Fig. 1B, D View Fig ), except for Coptocheilus maydelineae (Páll-Gergely, P.K. Nguyen & Y. Chen, 2019) , which clearly differs by having a strongly ribbed shell. Coptocheilus sectilabris (A. Gould, 1844), which was also reported from Vietnam ( Thach, 2016), is larger, with a more corpulent shell and wider body whorl.

Etymology. The specific epithet ‘maunautim’ (to be used as a noun in apposition) derives from “màu nâu tím”, meaning “a mixture of brown and purple” in Vietnamese, referring to the colour of the shell.

Distribution. This new species is only known from the type locality so far ( Fig. 2 View Fig ).

Checklist of Coptocheilus species

The most recent review by Páll-Gergely et al. (2019) erroneously used the generic name Schistoloma (grammatical gender: neutral). Here we provide an updated checklist of the species, now included in Coptocheilus (grammatical gender: masculine), to reflect changes in parentheses around authors’ names in changed combinations and agreement in gender of species names.

Coptocheilus altus (Sowerby I, 1842)

Coptocheilus anostomus ( Benson, 1852)

Coptocheilus cochinchinensis ( Rochebrune, 1882) Coptocheilus doriae ( Issel, 1874)

Coptocheilus funiculalus ( Benson, 1838)

Coptocheilus inermis Bavay & Dautzenberg, 1909

Coptocheilus leferi ( Morelet, 1861)

Coptocheilus longyanensis ( Zhou, Zhang & Chen, 2009)

Coptocheilus maydelineae (Páll-Gergely, P.K. Nguyen & Y. Chen, 2019)

Coptocheilus mcgregori ( Bartsch, 1916)

Coptocheilus messageri Bavay & Dautzenberg, 1909

Coptocheilus pauperculus (Sowerby I, 1850)

Coptocheilus quadrasi ( Hidalgo, 1889)

Coptocheilus sectilabris (A. Gould, 1844)

Coptocheilus sumatranus Dohrn, 1881

Coptocheilus tanychilus ( Godwin-Austen, 1876)

Bartsch P (1916) The Philippine land shells of the genus Schistoloma. Proceedings of the United States National Museum, 49 (2104): 195 - 204.

Bavay A & Dautzenberg P (1909) Description de coquilles nouvelles de l'Indo-Chine. Journal de Conchyliologie, 57: 81 - 105, 163 - 206, 279 - 288.

Benson WH (1838) On the land and fresh-water shells of the Western Himalaya. Journal of the Asiatic Society of Bengal, 7 (75): 211 - 218.

Benson WH (1852) Notes on the genus Cyclostoma; and characters of some new species from India, Borneo, and Natal. Annals and Magazine of Natural History, Series 2, 10: 268 - 272.

Dohrn H (1881) Mittheilungen aus dem Gebiete fer Malakozoologie; Neue ostasiatische Landconchylien. Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft, 13: 65 - 67.

Godwin-Austen HH (1876) On the Cyclostomacea of the Dafla Hills, Assam. Journal of the Asiatic Society of Bengal, 45 (2): 171 - 184.

Gould AA (1844) Descriptions of land shells from the province of Tavoy, in British Burmah. Boston Journal of Natural History, 4: 452 - 459.

Hidalgo JG (1889) Especes nouvelles ou peu connues de Coquilles terrestres des iles Philippines. Journal de Conchyliologie, 37: 296 - 306.

Issel A (1874) Molluschi Borneensi. Illustrazione delle specie terrestri e d'acqua dolce raccolte nell'isola di Borneo. Dai Signori G. Doria e O. Beccari. Memoria di Arturo Issel. Annali del Museo Civico di Storia Naturale di Genova, 6: 366 - 486.

Morelet MA (1861) Diagnoses de trois Cyclostomes nouveaux. Journal de Conchyliologie, 9: 176 - 177.

Pall-Gergely B, Nguyen PK & Chen Y (2019) A review of Vietnamese Schistoloma Kobelt, 1902 with a list of all known species of the genus (Caenogastropoda: Cyclophoroidea: Pupinidae). Raffles Bulletin of Zoology, 67: 322 - 327.

Rochebrune T (1882) Documents sur la faune malacologique de la Cochinchine et du Cambodge. Bulletin de la Societe Philomathique, 7 (6): 35 - 74.

Thach NN (2016) Vietnamese New Mollusks. Seashells - Land snails - Cephalopods, with 59 new species. 48 HrBooks Company, Akron, Ohio, 205 pp.

Varga A (1972) Neue Schnecken-Arten aus Vietnam (Gastropoda, Cyclophoridae). Annales Historico-Naturales Musei Nationalis Hungarici, 64: 133 - 137.

Zhou W-C, Zhang W-H & Chen D-N (2009) A new species of the genus Schistoloma from China (Prosobranchia, Mesogastropoda, Pupinidae). Acta Zootaxonomica Sinica, 34 (1): 122 - 124.

Gallery Image

Fig. 1. A, C, holotype of Coptocheilus maunautim, new species (MNHN-IM-2000-35697), with “double suture” indicated by arrows; B, D, Coptocheilus messageri (SMF 192263) with simple suture indicated with an arrow. Scale a represents 10 mm and refers to fig. A and B, scale b represents 5 mm and refers to fig. C and D.

Gallery Image

Fig. 2. Distribution of Coptocheilus species in Vietnam. 1, C. messageri (Bavay & Dautzenberg, 1909); 2, C. inermis (Bavay & Dautzenberg, 1909) (type locality of Pinteria croesus Varga, 1972); 3, C. maunautim, new species; 4, C. sectilabrum (A. Gould, 1844); 5, C. maydelineae (Páll-Gergely, P.K. Nguyen & Y. Chen, 2019); 6, C. cochinchinense (Rochebrune, 1882) (based on Thach, 2016 and Páll-Gergely et al., 2019).

T

Tavera, Department of Geology and Geophysics

VNMN

Vietnam National Museum of Nature

IZ

Instituto de Zoologia

ZRC

Zoological Reference Collection, National University of Singapore