Metzia longinasus, a new cyprinid species (Teleostei: Cypriniformes) from the Pearl River drainage in Guangxi Province, South China

Abstract

Metzia longinasus, a new cultrine cyprinid species from the Hongshui-He River of the Pearl River drainage in Guangxi Province, southern China, is described here. It can be distinguished from all other congeners by having a combination of the following characters: a superior mouth, 43 or 44 lateral-line scales, a long head (length 27.2-30.8% of standard length), a long snout (length 31.7-37.0% of head length), 10 or 11 branched anal-fin rays, and no longitudinal black band extending along each side of body from the extremity of the gill opening to caudal-fin base.

Metzia parva, a new cyprinid species (Teleostei: Cypriniformes) from south China

“…Chen and Fang (2002) distinguished M. mesembrinum from M. lineata and considered it as endemic to Taiwan. After reviewing descriptions of the widely distributed M. lineata in the literature (Pellegrin 1907, Chu and Chen 1989, Nguyen and Ngo 2001 and examining specimens, Gan et al (2009) thought this species should be split into two; for the time being its status remains unclear. There is less doubt about M. formosae and two other newly described species: M. longinasus (Gan et al 2009) and M. bounthobi (Shibukawa et al 2012).…”

“…Kimura's 2-parameter distances (K2P; Kimura 1980) and neighbor-joining (NJ) trees were calculated and reconstructed by using MEGA6 (Tamura et al 2013) Description. Morphological characteristics of the genus Metzia were presented by Chen et al (1998) and Gan et al (2009) and are not repeated herein. Morphometric data of the twelve type specimens are shown in Table 1.…”

“…Counts and measurements were taken on the left side of specimens, and techniques followed Xie et al (2003) and Gan et al (2009) with the exception of predorsal scales as these were too indistinct to count accurately in our specimens. Measurements were made with a dial caliper and recorded to a tenth of a millimeter.…”

“…Each character presented as: range (mean ± standard deviation). *Data for M. formosae and M. longinasus were obtained from Gan et al (2009).…”

“…Here we follow Kottelat (2001) and consider Metzia Jordan and Thompson (1914) as a senior synonym of Rasborinus Oshima (1920). Gan et al (2009) and Shibukawa et al (2012) revised this genus to comprise seven species: M. mesembrinum (Jordan & Evermann 1902), M. lineata (Pellegrin 1907), M. formosae (Oshima 1920), M. alba (Nguyen 1991), M. hautus (Nguyen 1991), M. longinasus (Gan et al 2009) and M. bounthobi (Shibukawa et al 2012). The principal diagnostic characteristics of Metzia include a compressed body, an abdomen with a sharp keel between the pelvic-fin insertion and the anus, soft dorsal-fin rays with 3 unbranched and 7 branched rays, and a bipartite gas bladder with a rounded posterior chamber (Chen et al 1998).…”