Hemiplecta lanxangnica Inkhavilay & Panha nom. nov.

Helminthoglypta huberi Thach, 2017: 54, figs 747-749 [non Hemiplecta huberi Thach, 2017: 33, figs 389-391]. Type locality: Thakhek, Khammouane Province, Central Laos.

Etymology.

The species name " lanxangnica " is derived from "Lan Xang", the name of the historical empire during 13th to 18th centuries, which represents the current Laotian area.

Material examined.

Holotype RMNH 5006710, paratype MNHN-IM-2000-33215 (1 shell; Fig. 36C). Specimens from Tam Xang Cave, Thakhek District, Khammouan Province (Fig. 36D).

Distribution.

Known only from the type locality in Laos (Thach 2017).

Remarks.

The genus Helminthoglypta Ancey, 1887 is mainly distributed in the California and northwest of Mexico (Schileyko 2004: 1722). In addition, the Xanthonychidae, to which this genus belongs, is mainly distributed in the New World: Central America, North America and north of South America (Schileyko 2004) and has never been recorded in the Oriental region. Placing this species in the Helminthoglypta seemed inappropriate. The medium size (width 27-34 mm and height 18-23 mm), rimate umbilicus, thin wrinkle shell surface and simple apertural lip make this species more closely resemble the genus Hemiplecta . However, examination of the genitalia anatomy is required to confirm their systematic position.

By relocating Helminthoglypta huberi Thach, 2017 to the genus Hemiplecta, it becomes a secondary homonym of Hemiplecta huberi Thach, 2017. According to the ICZN guideline (ICZN 1999: Arts 24.2.2, 57.3.1 and 60.3), the species name of a junior homonym has to be replaced, and so we propose Hemiplecta lanxangnica Inkhavilay & Panha nomen novum as the new replacement name.