Shuiyu xuchengweii Xiang, He, Lu & 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 : 56-57

Shuiyu xuchengweii Xiang, He, Lu & Chen , gen. et sp. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:8954CC18-0159-4F26-B4E0-7BC6E977A3A3

Fig. 2 K , Fig. 4 L

Material examined. Holotype: XHQ 24011101, shell height 11.0 mm. Yanjiang Town , Qilin District, Qujing City, Yunnan Province, China, 25.48°N, 103.87°E, June 2024, collected by Yue-Ming He and Hong-Quan Xiang ( Fig. 1 ).

Paratypes: 1 specimen, XHQ 24011102, shell height 10.8 mm, June 2024, locality and habitat same as holotype.

Diagnosis. Shell small, elongate conic, white, with eight whorls, the whorls with a row of large nodules, aperture ovate, outer lip reflexed.

Description. Shell small, translucent, but solid, elongate conic, white, with eight spiral whorls, including two protoconch whorls, teleoconch whorl inflated; third whorls with a weak keels; fourth to sixth whorls with a obviously keels; other whorls with two row of large nodules, nodules are composed of intersection of thick spiral keels and many axial ribs, body whorl swollen. Shell surface with faint spiral ribs. Apex obtuse. Umbilicus narrow and small, base white and with one weak keel around umbilical area. Aperture ovate, less than half of shell in height, inner lip thickened and smooth, outer lip reflexed and thickened.

Differential diagnosis. Compared with S. rillionaae gen. et sp. nov., S. shijiae gen. et sp. nov. and S. multicostata gen. et sp. nov., S. xuchengweii gen. et sp. nov. with less axial ribs. Compared with S. boyuwangi gen. et sp. nov., Shuiyue xuchengweii gen. et sp. nov. shell surface with faint spiral ribs.

Etymology. The species name " xuchengweii " originates from a biology enthusiast in Hechi, Guangxi. We suggest the Chinese common name as " 伟氏水玉Dz ".

Distribution and ecology. This species is only found in the lake sediments of Qilin District, 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 4. Shells of Shuiyu rillionaae gen. et sp. nov. (A) holotype (B-C) paratype. Shells of S. multicostata gen. et sp. nov. (D) holotype (E-G) paratype. Shells of S. shiji gen. et sp. nov. (H) holotype (I-J) paratype. Shells of S. boyuwangi sp. nov. (K) holotype. Shells of S. xuchengweii gen. et sp. nov (L) holotype. Shells of S. phoebe gen. et sp. nov. (M) holotype. Shells of S. quanyuzhangi gen. et sp. nov. (N) holotype. (O-P) paratype. Shells of S. candida gen. et sp. nov. (Q) holotype. (R-S) paratype. Scale bars = 10 mm.