Lacunopsis chengjiang Xiang, He, Li & Chen, 2025

Xiang, Hong Quan, Lu, Yi Zhi, He, Yue Ming, Li, Chong Ye, Gao, Han, Lv, Ang Song & Chen, Hui, 2025, Twenty-seven new species and four new genera of Gastropoda (Animalia: Mollusca) from plateau lake Quaternary sediments in Yunnan, southwestern China, Ecologica Montenegrina 84, pp. 48-71 : 64

Lacunopsis chengjiang Xiang, He, Li & Chen , sp. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:BB3B5C1A-A9C7-409D-82BD-007A5CEEDABC

Fig. 2 V , Fig. 8 A-C

Material examined. Holotype: XHQ 24012201, shell height 4.8 mm, Haijing , Lake Fuxian, Yuxi City, Yunnan Province, China, 24°37′22″N, 102°51′32″E, January 2025, collected by Yue- Ming He, Hong-Quan Xiang and Chong-Ye Li ( Fig 1 ).

Paratypes: 2 specimens, XHQ 24012202-03, shell height 5.0–6.0 mm, January 2025, locality and habitat same as holotype.

Diagnosis. Shell small, short conical, orange, with four whorls, shell surface with nodules, inner lip with not obvious prominent tooth.

Description. Shell small, but solid, short conical, orange, with four whorls, whorls flattish. Whorls sharply carinate at periphery in both young and adult shells. Shell surface with nodules. Apex obtuse. Umbilicus closed. Aperture ovate. Inner lip thickened and smooth, with not obvious prominent tooth; outer lip smooth.

Differential diagnosis. In terms of shell morphology, the new species possesses a unique shell characteristic of the Lacunopsis . Its resembles L. yunnanensis from the Yunnan, but L. chengjiang sp. nov. shell surface with nodules, a not obvious prominent tooth near the inner lip.

Etymology. The species name "Chengjiang" is derived from the ancient name of the lake where it is located "Chengjianghai". We suggest the Chinese common name as " 澂江ŪŘDz ".

Distribution and ecology. This species is only found in the lake sediments of Lake Fuxian in Yuxi, Yunnan Province.

Figures

Figure 1. Map of the ancient lakes and rivers in the Yunnan Province, south-west China, showing the sampling sites.

Figure 2. (A) paratype, Paraprososthenia bronyaae sp. nov. (B) holotype, P. bicarinata sp. nov. (C) holotype, P. jinxi sp. nov. (D) holotype, P. geguoi sp. nov. (E) holotype, P. yunjian sp. nov. (F) holotype, P. yuanqin sp. nov. (G) holotype, Shuiyu rillionaae gen. et sp. nov. (H) holotype, S. multicostata gen. et sp. nov. (I) holotype, S. shiji gen. et sp. nov. (J) holotype, S. boyuwangi gen. et sp. nov. (K) holotype, S. xuchengweii gen. et sp. nov. (L) holotype, S. phoebe gen. et sp. nov. (M) holotype, S. quanyuzhangi gen. et sp. nov. (N) holotype, S. candida gen. et sp. nov. (O) holotype, Qilinia longfeicheni gen. et sp. nov. (P) holotype, Jullienia quan sp. nov. (Q) holotype, J. chengyuangongi sp. nov. (R) holotype, Fenouilia zihaozhaoi sp. nov. (S) holotype, F. yizhou sp. nov. (T) holotype, F. pluvia sp. nov. (U) holotype, F. gaorange sp. nov. (V) holotype, Lacunopsis chengjiang sp. nov. (W) holotype, L. luliangensis sp. nov. (X) holotype, Longhai zhongxian gen. et sp. nov. (Y) holotype, Gyraulus fuxianensis sp. nov. (Z) holotype, Xingyuan jiamingzhangi gen. et sp. nov. (ZA) holotype, X. zhihehongi gen. et sp. nov. Scale bars = 10 mm.

Figure 8. Shells of Lacunopsis chengjiang sp. nov. (A) holotype (B-C) paratype. Shells of L. luliangensis sp. nov. (D) holotype (E-F) paratype. Scale bars = 10 mm.