Jullienia chengyuangongi 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 : 61

Jullienia chengyuangongi Xiang, He, Lu & Chen , sp. nov. sp. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:E9E6EE43-7446-4527-971E-906398E4CB41

Fig. 2 Q , Fig. 6 D-F

Material examined. Holotype: XHQ 24011701, shell height 10.5 mm. Zhongshu Town , Luliang County, Qujing City, Yunnan Province, China, 25.02°N, 103.66°E, June 2022, collected by Yue-Ming He and Hong-Quan Xiang ( Fig. 1 ).

Paratypes: 2 specimens, XHQ 24011702-03, shell height 9.0- 9.2 mm, June 2022, locality and habitat same as holotype.

Diagnosis. Shell small, ovate-conic, white, with five whorls, shell surface with many keels, body whorl big and swollen, aperture ovate, outer lip thickened.

Description. Shell small, but solid, ovate-conic, white, with five spiral whorls, including two protoconch whorls, teleoconch whorl inflated; third to fourth spiral whorls with two keels; other whorls with a three keels, body whorl big and swollen. Apex obtuse. Umbilicus narrow, base white. Aperture ovate, near than half of shell in height, inner lip thickened and smooth, outer lip thickened.

Differential diagnosis. Compared to Jullienia carinata (Fulton, 1904) and Jullienia harmandi (Poirier, 1881) , Jullienia chengyuangongi sp. nov. has two keels on the spiral whorls. Compared to Jullienia quan sp. nov., Jullienia chengyuangongi sp. nov. without keel around umbilical area. Compared to Jullienia munensis (Brandt, 1974) , Jullienia acuta (Poirier, 1881) , Jullienia rolfbrandti (Temcharoen, 1971) and Jullienia flava (Deshayes, 1876) , Jullienia chengyuangongi sp. nov. aperture ovate, outer lip not reflexed.

Etymology. The species name " chengyuangongi " originates from a biology enthusiast in Yuxi, Yunnan. We suggest the Chinese common name as " ffi氏dz氏Dz ".

Distribution and ecology. This species is only found in the lake sediments of Lake Lulianghai in Qujing, 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 6. Shells of Jullienia quan sp. nov. (A) holotype (B-C) paratype. Shells of J. chengyuangongi sp. nov. (D) holotype (E-F) paratype. Scale bars = 10 mm.