title: Metzia parva, a new cyprinid species (Teleostei: Cypriniformes) from south China.
abstract: A new species of a small cyprinid fish, Metzia parva sp. nov., is described here based on specimens collected from a tributary of Hongshui-He River in the Pearl River basin at Anyang Town, Du'an County, Guangxi Province, south China. It differs from congeners in having a smaller body with a standard length of 48.3-57.7 mm (vs. 58.3-151.4 mm in other species); a complete lateral line (although some specimens show interruptions on the ventral margin above the anal-fin); 12-14 branched anal-fin rays (vs. 10-11 or 15-20); 10 branched pectoral-fin rays (vs. 11-16); 6 branched pelvic-fin rays (vs. 7-9); a longer caudal peduncle (17.8-21.7% vs. 14.8-17.4% SL); a shorter preanal length (60.9-66.0% vs. 69.0-73.0% SL) and an obviously larger interorbital width (28.4-33.0% vs. 20.2-24.7% of head length). While Metzia parva shares a lateral black stripe from the gill opening to the caudal-fin base with M. formosae, the new species can be distinguished from M. formosae by a deeper head (16.4-19.2% vs. 13.3-15.7% SL) and a longer anal fin (15.4-18.9% vs. 10.0-13.6% SL) in addition to the diagnostic characters above. Kimura's 2-parameter genetic distance between the two species is 6.6% for the barcoding region of the mitochondrial COI gene and 7.3% across the complete mitochondrial genome.
authors.affiliation: Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Science, Beibei, Chongqing 400715, China.; Email: unknown.
authors.forename: Wen
authors.initials: W
authors.lastname: Luo
authors.affiliation: Cornell University Museum of Vertebrates, 159 Sapsucker Woods Road, Ithaca, New York 14850 USA.; Email: jpsullivan@cornell.edu.
authors.forename: John P
authors.initials: JP
authors.lastname: Sullivan
authors.affiliation: Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Science, Beibei, Chongqing 400715, China. School of Ecological Engineering, Guizhou University of Engineering Science, Bijie, Guizhou 551700, China.; Email: unknown.
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Science, Beibei, Chongqing 400715, China.; Email: pengzuogang@gmail.com.
authors.forename: Zuo-Gang
authors.initials: ZG
authors.lastname: Peng
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D002681:China; D003530:Cyprinidae / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D017753:Ecosystem; D005260:Female; D008297:Male; D009929:Organ Size