Pseudopostolata Dai, Chen, Huang & Wu, 2024

Dai, Yu-Ting, Chen, Zhong-Guang, Cheng, Yu-Zhuo, Huang, Xiao-Chen, Ouyang, Shan, Shu, Feng-Yue & Wu, Xiao-Ping, 2024, Molecular phylogeny reveals a new genus and species of freshwater mussel (Bivalvia, Unionidae, Gonideinae) from Jiangxi, China, Zoosystematics and Evolution 100 (4), pp. 1419-1429 : 1419-1429

Genus Pseudopostolata Dai, Chen, Huang & Wu gen. nov.

Figs 2 C, D , 4

Type species.

Pseudopostolata angula Chen, Dai, Huang & Wu , sp. nov.

Diagnosis.

Shell medium size, moderately thick, flat, long, glossy, black without any color rays. Anterior rounded, short, posterior long, and wide. Dorsal margin slightly curved downwards and truncated behind, with a distinct obtuse angle in the middle of posterior margin. Shell surface with a low secondary posterior ridge end in the angle on the posterior margin. Both left and right valves with one or two pseudocardinal teeth.

Etymology.

The specific name pseudopostolata is made from the Latin pseudo for false and postolata for a unionid genus, alluding to their similar shell morphology.

Vernacular name.

‘ Pseudorear-wide mussel genus’ (English) and ‘ Ni Hou Ju Bang Shu’ (拟后矩蚌属) (Chinese).

Distribution.

Wujiang River in the Yongfeng section of Jiangxi Province, China.

Remarks.

The new genus belongs to the tribe Gonideini of the subfamily Gonideinae , which currently consists of only one species. The new genus exhibits morphological similarities with Postolata guangxiensis Dai, Huang, Guo & Wu, 2023 . However, it differs in terms of its elongated shell and the more distinct angle on the posterior margin.

Figures

Figure 2. The type locality and shell morphology of Pseudopostolata angula gen. et sp. nov. A, B. General view of the type locality, Wujiang River, Ji’an City, Jiangxi Province, China; C, D. Shell morphology of Pseudopostolata angula.

Figure 4. Eight specimens of Pseudopostolata angula gen. et sp. nov. were collected from the Wujiang River in Ji’an City, Jiangxi, China. A is the holotype; A-H responds to specimen vouchers: 24 _ NCU _ XPWU _ PA 01 - 24 _ NCU _ XPWU _ PH 08.