Shuiyu shiji 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 : 55-56

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

https://zoobank.org/ urn:lsid:zoobank.org:act:3A3797A3-CBA5-4D98-A78B-681B1C36AD76

Fig. 2 I , Fig. 4 H-J

Material examined. Holotype: XHQ 24010901, shell height 21.0 mm. Zhongshu Town , Luliang County, Qujing City, Yunnan Province, China, 25.02°N, 103.66°E, June 2021, collected by Yue-Ming He and Hong-Quan Xiang ( Fig. 1 ).

Paratypes: 2 specimens, XHQ 24010902-03, shell height 20.2-25.0 mm, June 2023, locality and habitat same as holotype.

Diagnosis. Shell small, elongate conic, white, with ten whorls, the whorls with axial ribs, aperture ovate, outer lip reflexed.

Description. Shell small, translucent, but solid, elongate conic, grey, with ten spiral whorls, including two protoconch whorls, teleoconch whorl inflated; third whorls smooth; other whorls with eleven axial ribs, body whorl not swollen. 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. and S. multicostata gen. et sp. nov., Shuiyu . shiji gen. et sp. nov. shells longer and with less axial ribs.

Etymology. The species name " shiji " originates from ancient Chinese agricultural culture, refers to the practice of using lake water for irrigating farmland. We suggest the Chinese common name as " aeṣ水玉Dz ".

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