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| Sinobdella longitubulus Shan & Zhang, in Shan, Li et Zhang, 2024. |
Abstract
Background: The spiny eel genus Sinobdella belongs to the family Mastacembelidae of the order Synbranchiformes. Kottelat and Lim (1994) utilised Rhynchobdella sinensis as the type species to propose the genus. Currently, it contains a single species widespread in eastern and southern China and northern Vietnam.
New information: Sinobdella longitubulus, a new species of spiny eel, is here described from the Xi-Jiang of the Zhu-Jiang Basin in Guangxi Zhuang Autonomous Region, southern China. It differs from the single congeneric species S. sinensis in having a more or less white-brown reticulated pattern on the flank, two tubular anterior nostrils longer than or equal to the rostral appendage, an anal fin heavily mottled with dark brown markings and white spots and bearing a narrow white distal margin; shorter pre-anal length; and fewer abdominal vertebrae. The validity of this new species is corroborated by its monophyly recovered in a COI gene-based phylogenetic analysis and its significant sequence divergence with S. sinensis. A note on the type locality of S. sinensis is also given; its type specimen is possibly from mountain streams of Jiangxi Province, in the lower Chang-Jiang Basin.
Keywords: Sinobdella, new species, taxonomy, Zhu-Jiang Basin
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| Sinobdella longitubulus, holotype, IHB 202303066738, 153.3 mm SL, dorsal (a), lateral (b) and ventral (c) views. China: Guangxi Province: Guigang City: Pingnan County: Lilia Village: Datong-Jiang, a stream tributary to Meng-Jiang flowing into Xi-Jiang of Zhu-Jiang basin. |
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| Sinobdella longitubulus, IHB 202303066740, 148.7 mm SL, China: Guangxi Province: Guigang City: Pingnan County: Lilia Town: Datong-Jiang: Zhu-Jiang Basin; |
Sinobdella longitubulus Shan & Zhang sp. nov.
Diagnosis: Sinobdella longitubulus is clearly distinguished from the single congeneric species (S. sinensis) by having a more or less white-brown reticulated pattern (vs. many dark brown vertical bars, with very narrow light yellow interspaces) on the flank (Fig. 2), two tubular anterior nostrils longer than or equal to (vs. shorter than) the rostral appendage (Fig. 3), an anal fin heavily mottled with dark brown markings and white spots and bearing a narrow white distal margin (vs. black with a relatively wide light white distal margin) (Fig. 2); shorter pre-anal length (53.3-56.2 vs. 56.3-60.6 % SL; see Fig. 4) and fewer abdominal vertebrae (32-33, mean = 32.9 vs. 34-36, mean = 35.1) (Table 1).
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Etymology: The epithet name, used here as a noun, is derived from the Latin word longus (= long) and tubulus (= pipe), alluding to two longer tubes modified from anterior nostrils. The common Chinese name here suggested for this new species is “长管华刺鳅”.
Peng Shan, Guangyu Li and E Zhang. 2024. Sinobdella longitubulus, A New Species of Spiny Eel (Pisces, Mastacembelidae) from the Zhu-Jiang Basin, with A Note on the Type Locality of S. sinensis (Bleeker, 1870). Biodiversity Data Journal. 12: e123990. DOI: 10.3897/BDJ.12.e123990