Abstract
Tanichthys albiventris, new species, from the River Jiangping in Dongxing City, Guangxi Province is distinguished from Tanichthys albonubes by the presence of a reddish-orange dorsal-fin margin (vs. white) and 9-10 (9 in mode) branched anal-fin rays (vs. 8 in mode). Tanichthys flavianalis, new species, from the River Jiuqu in Qionghai City, Hainan Province is distinguished from T. albiventris and T. albonubes by the presence of a golden anal-fin margin (vs. white) and 7 (rarely 6) branched dorsal-fin rays (vs. 6 in mode). In T. albiventris, T. albonubes, and T. flavianalis the black lateral stripe is located on the dorsal half of the flank, distinguishing them from Tanichthys kuehnei and Tanichthys micagemmae, in which it is mid-lateral. Tanichthys thabacensis is different from all other species of Tanichthys in the shape of the mouth and insertion of the anal fin; it is tentatively referred to as Aphyocypris.
Highlights
The minnow genus Tanichthys Lin, 1932 are small freshwater fishes characterized by confluent narial openings, and the presence of cornified tubercles on the snout posterior to the premaxilla in adult males (Weitzman & Chan 1966, Freyhof & Herder 2001, Bohlen et al 2019)
Based on detailed examination of specimens of Tanichthys collected from six localities in southern China, and coupled with molecular analysis using the cytochrome b gene, we found two new species, and describe them in the present paper (Table 1, Fig. 1)
Based on the data in the present study, the two new species can be distinguished from all other congeneric species, excluding T. thacbaensis, by the colour of the dorsal- and anal-fin margins and the number of branched dorsal- and anal-fin rays (Table 3; Figs. 2-3)
Summary
The minnow genus Tanichthys Lin, 1932 are small freshwater fishes characterized by confluent narial openings, and the presence of cornified tubercles on the snout posterior to the premaxilla in adult males (Weitzman & Chan 1966, Freyhof & Herder 2001, Bohlen et al 2019). This genus was placed either in the subfamily Leuciscinae (Chu 1935, Yang & Huang 1964), the subfamily Danioninae (Chen 1998, Nelson et al 2016), or a sister group to the subfamily Acheilognathinae (Liao et al 2011) under the family Cyprinidae. Based on detailed examination of specimens of Tanichthys collected from six localities in southern China, and coupled with molecular analysis using the cytochrome b (cytb) gene, we found two new species, and describe them in the present paper (Table 1, Fig. 1)
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