Paraprososthenia geguoi Xiang, He, Lu & Chen 2025, sp. nov.

Paraprososthenia geguoi Xiang, He, Lu & Chen, sp. nov. https://zoobank.org/ urn:lsid:zoobank.org:act: D6BC9738-9550-49A9-B945-F6F674606ED4 Fig. 2 D, Fig. 3 H-J Material examined. Holotype: XHQ 24010401, shell height 20.0 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 24010402-03, shell height 22.0- 18.5 mm, June 2023, locality and habitat same as holotype. Diagnosis. Shell small, elongate conic, white, with eight whorls, the whorls with two row of obvious nodules, aperture ovate, inner lip thickened. Description. Shell small, but solid, elongate conic, grey, with eight whorls, including two protoconch whorls, teleoconch whorl inflated; third whorls with a weak keels; other whorls with two row of obvious nodules, nodules are composed of intersection of spiral keels and many weak axial ribs; body whorls not swollen. Shell surface with very obvious axial growth lines. Apex obtuse. Umbilicus narrow and small, base with one keel around umbilical area. Aperture ovate, inner lip thickened and smooth; outer lip thickened and reflexed. Differential diagnosis. Compared with P. costata, P. gredleri and P. constricta, Paraprososthenia geguoi sp. nov. shell is wider and two row of obvious nodules. Compared to Parapyrgula coggini, Paraprososthenia bicarinata sp. nov., P. jinxi sp. nov. and P. bronyaae sp. nov., Paraprososthenia geguoi sp. nov. shell without obvious keels and has many week axial ribs. Etymology. The species is named after Ge Guo (Beijing, China), a conchologist and shell enthusiast. We suggest the Chinese common name as " 国歌川ϐ ". Distribution and ecology. This species is only found in the lake sediments of Lake Lulianghai in Luliang, Yunnan Province.