Sinosolenaia, Bolotov & Kondakov & Konopleva & Vikhrev & . & . & . & ., 2021

Bolotov, Ivan N., Kondakov, Alexander V., Konopleva, Ekaterina S., Vikhrev, Ilya V., .,., ., . & ., 2021, A new genus of ultra-elongate freshwater mussels from Vietnam and eastern China (Bivalvia: Unionidae), Ecologica Montenegrina 39, pp. 1-6 : 2

Genus Sinosolenaia gen. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:F6329FCD-887E-4104-8ECA-0268B89A3E53

Type species: Micetopus [sic!] recognitus Heude, 1877 .

Etymology: The name of this genus is compiled using words “ Sino ” (i.e. Chinese) and “ Solenaia ” (the former generic name for this clade).

Differential diagnosis: The new genus can be distinguished from the sister taxon Solenaia by more elongated concentric ridges on shell surface, less developed umbo, and narrower hinge plate.

Description: This genus was found to be a separate clade within the tribe Gonideini . Its members share an ultra-elongate, thin shell, tapering anteriorly, with a narrow anterior margin. Posterior slope triangularly shaped, pointed at the end ventrally and posteriorly. Gonial ridge prominent. Umbo not prominent, with weak sculpture of waved, concentric ridges. Hinge plate narrow, with traces of lateral teeth.

Distribution: Red (Hồng Hà) River basin in northern Vietnam to the Yangtze River basin in eastern China.

Comments: This group appears to contain not less than four valid species, which are listed below. Among them, Sinosolenaia carinata ( Heude, 1877) comb. nov. can be distinguished from other species by having the narrowest, sometimes pointed anterior margin (vs. broader and rounded) ( Fig. 1C ). The other three species can be joined into the Sinosolenaia iridinea species complex and could not clearly be separated based on morphological criteria ( Fig. 1 A-B).

Figures

Figure 1. Examples of Sinosolenaia gen. nov. shells (external view of the left valves). (A) S. recognita (Heude, 1877) gen. & comb. nov., Hanoi, Red (Hồng Hà) River basin, northern Vietnam. (B) S. oleivora (Heude, 1877) comb. nov., Yangtze River basin, eastern China. (C) S. carinata (Heude, 1877) comb. nov., Yangtze River basin, eastern China. Scale bars = 25 mm. (Photo: Yulia S. Kolosova [A], Huang et al. (2019) [B-C]).