Shuiyu xuchengweii Xiang, He, Lu & Chen 2025, gen. et sp. nov.

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.