Paraprososthenia geguoi 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 : 51-52

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.

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 3. Shells of Paraprososthenia bronyaae sp. nov. (A, C) paratype (B) holotype. Shells of P. bicarinata sp. nov. (D) holotype (E) paratype. Shells of P. jinxi sp. nov. (F) holotype (G) paratype. Shells of P. geguoi sp. nov. (H) holotype (I-J) paratype. Shells of P. yunjian sp. nov. (K) holotype (L-M) paratype. Shells of P. yuanqin sp. nov. (N) holotype. Scale bars = 10 mm.