Laotia christahemmenae christahemmenae Páll-Gergely, 2014

Páll-Gergely, Barna & Hunyadi, András, 2021, A new species and a new subspecies of Laotia Saurin, 1953 (Gastropoda: Caenogastropoda: Alycaeidae) from Sơn La Province, Vietnam, Raffles Bulletin of Zoology 69, pp. 118-123 : 120

publication ID

https://doi.org/ 10.26107/RBZ-2021-0010

publication LSID

lsid:zoobank.org:pub:DD656B82-2FF6-444F-B259-827EDC7F3715

persistent identifier

https://treatment.plazi.org/id/03B2EC0B-FFC7-FFAB-FF55-FF1AFC2BBA36

treatment provided by

Diego

scientific name

Laotia christahemmenae christahemmenae Páll-Gergely, 2014
status

 

Laotia christahemmenae christahemmenae Páll-Gergely, 2014 View in CoL

( Fig. 1A View Fig )

Laotia christahemmenae Páll-Gergely, 2014: 291 View in CoL , fig. 3.

Laotia christahemmenae View in CoL — Do et al., 2015: 120, fig. 2D (new records from SƠn La Province).

Material examined. 8 adult + 13 juvenile shells (coll. HA), Vietnam, SƠn La Province, 27 km ESE from centre of Phù Yên, MƯ ờng Do, Han Một Village , ca. 300 m south from the village, 810 m a.s.l., 21°11.731′N, 104°47.129′E (locality code: 2020/7), coll. A. Hunyadi, H. V. Luong, J.U. Otani & S. V. Pham, 6 February 2020; 1 photographed shell GoogleMaps + 1 adult shell + 1 juvenile shell (VNMN-Z-Inv.000221), Vietnam, SƠn La Province, Mộc Châu District, Nȏng trƯờng Mộc Châu , Ngũ Đ ộng Bản Ȏn , around the cave, 895 m a.s.l., 20°52.489′N, 104°42.533′E (locality code: 2020/23 and 20200210A), coll. A. Hunyadi, H. V. Luong, J.U. Otani & S. V. Pham, 10 February 2020 GoogleMaps ; 10 adult + 9 juvenile shells (coll. HA), same data as preceding GoogleMaps ; 1 adult + 3 juvenile shells (coll. JUO), same data as preceding; 1 broken shell (coll. HA), Vietnam, SƠn La Province, Mộc Châu District, Vân H ồ, northwestern edge of Pa C ốp towards Bó Nhàng , 980 m a.s.l., 20°46.001′N, 104°45.203′E (locality code: 2020/24), coll. A. Hunyadi, H. V. Luong, J.U. Otani & S. V. Pham, 10 February 2020; 1 broken and corroded shell (MNHN- IM-2012-27224), Central Laos, Luang Prabang Province, ca. 6 km N of Phou Khoun, under rocks in dry secondary forest under and above cliff, 19°29.653′N, 102°24.470′E, 1,244 m a.s.l. (locality code: 34L06), coll. A. Abdou & I. V. Muratov, 16 November 2006 ( L. cf. christahemmenae ) GoogleMaps .

Measurements (in mm). D: 4.3–5.2, H: 2.5–2.8 (2020/23); D: 4.6–5.0, H: 2.6–2.8 (2020/7) (smallest and largest shells of each lot measured).

Distribution. Laotia christahemmenae christahemmenae is known from Ha Noi and SƠn La Provinces in northern Vietnam; its occurrence in Luang Prabang Province of Laos requires verification, see Remarks ( Fig. 2 View Fig ).

Remarks. In the original description only a strongly corroded holotype and a paratype with broken aperture were available, therefore the fine sculpture and intraspecific variability of this species could not be properly described. The newly collected specimens agree with the holotype in general shell shape and the absence of ribs behind the peristome; therefore they are treated conspecific. The holotype had ca. 86 ribs on the last whorl, whereas it was slightly more in most (but not all) shells of the newly examined populations (2020/23: 74–98 ribs/last whorl, n=3; 2020/7: 100–110 ribs/ last whorl, n=3). The rib morphology of the newly collected shells could also be examined. The first ca. 1.5 whorls of the teleoconch possess widely-spaced ribs. The rib density changes rather abruptly to denser ribbing, and remains such until the ribs disappear near the aperture. Ribs (even the ones on the initial teleoconch whorls) are bent in direction of their anterior neighbours (towards aperture), apart from the widely-spaced ribs on the first 1.5 teleoconch whorls the ribs nearly reaching each other. In case of L. luongi , new species, the ribs are straight.

The single shell from Luang Prabang province in Laos (MNHN-IM-2012-27224) is strongly corroded, its apex and body whorl are broken. It matches with other L. christahemmenae shells in general shell shape, size, and the absence of ribs behind the peristome. Therefore, until more material becomes available from the same locality, we provisionally identify these shells as Laotia cf. christahemmenae .

Midwestern University

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Alycaeidae

Genus

Laotia

Loc

Laotia christahemmenae christahemmenae Páll-Gergely, 2014

Páll-Gergely, Barna & Hunyadi, András 2021
2021
Loc

Laotia christahemmenae

Do DS & Nguyen THT & Do VN 2015: 120
2015
Loc

Laotia christahemmenae Páll-Gergely, 2014: 291

Pall-Gergely B 2014: 291
2014
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