Shuiyu candida 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 : 58-59

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

https://zoobank.org/ urn:lsid:zoobank.org:act:44B66558-9F74-4448-BCDC-640ACD139531

Fig. 2 N , Fig. 4 Q-S

Material examined. Holotype: XHQ 24011401, shell height 9.5 mm. Zhongshu Town , Luliang County, Qujing City, Yunnan Province, China, 25.02°N, 103.66°E, June 2024, collected by Yue-Ming He and Hong-Quan Xiang ( Fig. 1 ).

Paratypes: 2 specimens, XHQ 24011402-03, shell height 11.0- 10 mm; 1 collected from the type locality, June 2024; 1 collected from the Yanjiang Town , Qilin District, Qujing City, Yunnan Province, China, 25.48°N, 103.87°E, June 2022 .

Diagnosis. Shell small, long pyramidal, white, with eight whorls, the whorls with nine axial ribs, aperture ovate, outer lip reflexed.

Description. Shell small, but solid, long pyramidal, white, with eight spiral whorls, including two protoconch whorls, teleoconch whorl inflated; third to fifth whorls with faint spiral ribs; other whorls with nine axial ribs, body whorl swollen. Apex obtuse. Umbilicus narrow, base white and with one 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. phoebe gen. et sp. nov., S. candida gen. et sp. nov. shell long pyramidal and third to fifth whorls with faint spiral ribs. Compared with S. multicostata gen. et sp. nov., S. xuchengweii gen. et sp. nov., S. phoebe gen. et sp. nov. and S. quanyuzhangi gen. et sp. nov., S. candida gen. et sp. nov. shell surface without nodules. Compared with S. boyuwangi gen. et sp. nov., S. candida gen. et sp. nov. with long pyramidal shell and with two row of nodules.

Etymology. The species name "candida " originates from the English word "candid," used to describe the species' immaculately white shell surface. We suggest the Chinese common name as " ĭ尔 玛水玉Dz ".

Distribution and ecology. This species is only found in the lake sediments of Lake Lulianghai and 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.