A new species of the gudgeon genus Microphysogobio Mori, 1934 (Cypriniformes: Cyprinidae) from Zhejiang Province, China
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摘要: 该文 描述了中国浙江省瓯江流域鮈亚科鱼类一新种，瓯江小鳔鮈（Microphysogobio oujiangensis sp. nov. ）。该新种可与属内的其它物种通过以下形态特征区分：口裂浅弧形，上颌角质边缘宽度为口宽的一半，上唇中央具有基本等大的6–10个单列排布的发达乳突，下唇中叶分裂为两个边缘圆弧状的方形凸起，其上具有沟痕；胸腹裸露区覆盖鳞片，仅胸鳍基前的胸部裸露无鳞，侧线鳞36–38，背鳍前鳞8–10；须长占头长的26.7%–31.4%；眼径占头长的30.9%–36.9%；眼间距占头长的21.3%–27.6%；鳔后室细小，长度小于眼径的一半。基于线粒体细胞色素b（cyt b）基因，通过使用贝叶斯法（BI）与最大似然法（ML）构建系统发育树，并结合物种划分方法，同样支持该种为新的分类单元，与短吻小鳔鮈（M. brevirostris）构成姊妹关系。Abstract: A new gobionine species, Microphysogobio oujiangensis sp. nov. , was collected from the Oujiang River Basin during field work in Lishui City, Zhejiang Province in 2021. The new species can be well distinguished from its congeners by the combination of the following characteristics: mouth shallow arc-shaped, width of cutting edge on upper jaw equal to half mouth width, central portion of anterior papillae arranged in one row with 6–10 well-developed papillae of equal size, medial pad on lower lip bisected into two squircle-shaped pads, and grooved; midventral region completely scaled and thorax scaleless, lateral line scales 36–38, pre-dorsal scales 8–10; barbel length 26.7%–31.4% of head length; eye diameter 30.9%–36.9% of head length, interorbital width 21.3%–27.6% of head length; posterior chamber of air-bladder weak, length smaller than half eye diameter. Bayesian inference and maximum-likelihood phylogenetic analyses based on the cyt b gene sequence and species delineation also supported the specimens as a distinct species, sister to M. brevirostris (Günther, 1868).
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Figure 1. Type photos, live photos, morphological comparisons, distribution, habitat, and phylogenetic position of Microphysogobio oujiangensis sp. nov.
A–C: Picture shows lateral view (A), ventral view (B), and dorsal view (C) of holotype (ASIZB 220814). D: Live individual, collected from same locality as type specimens. E–J: Original drawing of lip papillae system of Microphysogobio species: Microphysogobio oujiangensis sp. nov. (E), M. brevirostris (F), M. xianyouensis (G), M. fukiensis (H), M. zhangi (I), and M. alticorpus (J). K: Distribution of Microphysogobio oujiangensis sp. nov. and congeners. L: Habitat in type locality. M: Molecular phylogenetic tree of Microphysogobio oujiangensis sp. nov. and congeners based on cyt b sequence reconstructed by Bayesian inference; Bayesian posterior probabilities are shown on nodes and species delimitation results are shown on right. Photos by Zhi-Xian Sun.
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