taxonID	type	description	language	source
0E2BA8B234B05F1CAE89A5017447D607.taxon	description	Tables 2, Fig. 4 A – D, Suppl. material 1, 2	en	Liao, Mei, Yu, Jing, Luo, Tao, Lan, Chang-Ting, Zhou, Jia-Jun, Xiao, Ning, Zhou, Jiang (2025): Description of a new species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution 101 (4): 1763-1774, DOI: 10.3897/zse.101.160089
0E2BA8B234B05F1CAE89A5017447D607.taxon	etymology	Etymology. The species name “ guidongensis ” refers to its distribution in Guangxi (广西), also known as Gui (桂), specifically indicating that the species is found in the eastern region of Guangxi, China. The suggested English name for this species is the Guidong Hilly Loach, and its Chinese name is Guì Dōng Lǐng Qiū (桂东岭鳅).	en	Liao, Mei, Yu, Jing, Luo, Tao, Lan, Chang-Ting, Zhou, Jia-Jun, Xiao, Ning, Zhou, Jiang (2025): Description of a new species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution 101 (4): 1763-1774, DOI: 10.3897/zse.101.160089
0E2BA8B234B05F1CAE89A5017447D607.taxon	diagnosis	Diagnosis. Comparative data between new species and all nine known species within the genus Oreonectes are provided in Table 4. Oreonectes guidongensis sp. nov. can be distinguished from O. platycephalus and O. zhangi by the well-developed posterior chamber of air bladder (vs. reduced), from O. damingshanensis, O. guananensis, and O. luochengensis by six branched plevic-fin rays (vs. 7 or 7 – 8), from O. guilinensis and O. yuedongensis by seven branched dorsal-fin rays (vs. 6), from O. andongensis 10 inner gill rakers on the first gill arch (vs. 11 – 12), and from O. polystigmus by the tip of pelvic fin not reaching the anus (vs. reaching the anus), distance between the posterior base of the pectoral fin and the anterior base of the pelvic fin is 18.8 – 27.9 % of standard length (18.8 – 27.9 % HL vs. 27.9 – 34.1 %), and five supratemporal pores (vs. 3) (Figs 4, 5).	en	Liao, Mei, Yu, Jing, Luo, Tao, Lan, Chang-Ting, Zhou, Jia-Jun, Xiao, Ning, Zhou, Jiang (2025): Description of a new species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution 101 (4): 1763-1774, DOI: 10.3897/zse.101.160089
0E2BA8B234B05F1CAE89A5017447D607.taxon	description	Description. Morphometric data are given in Table 2 and Suppl. material 1. Dorsal-fin rays iii- 7, pectoral-fin rays i- 10, pelvic-fin rays i- 6, anal-fin rays iii- 5, 14 - 16 branched caudal-fin rays, and 10 inner gill rakers on the first gill arch. Body elongated and cylindrical, deepest body depth in front of dorsal-fin origin, deepest body depth of 13.3 – 17.6 % SL, with the insignificant depth decreasing from dorsal-fin origin to caudal-fin base. Head short, slightly depressed and flattened, maximum width greater than deepest depth (head width / head depth = 1.2 – 1.7). Snout round, oblique, and flat, length 36.0 – 43.2 % of head length (HL). Mouth inferior, curved, upper and lower lips smooth, lower lip with a V-shaped median notch. Three pairs of barbels are long: inrostral barbel length 28.1 – 47.3 % of HL, tips reaching the anterior margin of the eye; outrostral barbel length 45.6 – 68.6 % of HL, tips beyond the posterior margin of the eye. Maxillary barbel length 37.5 – 59.0 % of HL, tips not reaching to the posterior margin of the gill cover. Anterior and posterior nostrils narrowly separated, with an interspace of approximately 1.2 mm. Anterior nostril tube short, with an elongated short barbel-like tip. Eyes normal, diameter of 10.1 – 16.9 % HL. Gill opening small; gill rakers not developed, and 10 inner gill rakers on the first gill arch. Dorsal fin short, length 16.9 – 21.7 % of SL, pre-dorsal length 58.6 – 62.5 % of SL, distal margin round, origin posterior to pelvic-fin origin. Pectoral fin short, length 16.7 – 20.5 % of SL, pre-pectoral length 21.1 – 24.9 % of SL, tips reaching about half of the distance between the origin of pectoral and pre-pelvic fins. Pelvic-fin length 14.0 – 16.9 % of SL, pre-pelvic length 51.7 – 56.5 % of SL, tips not reaching the anus. Anal fin long, length 15.1 – 18.4 % of SL, tips not reaching the caudal-fin base. Caudal fin rounded, caudal peduncle length 11.6 – 16.6 % of SL, without adipose crests along either dorsal or ventral sides. Body completely covered with fine scales, except for head, thorax, and abdomen. Lateral line incomplete, exceeding tip of pectoral fin but not reaching the caudal fin base, with 6 – 10 pores, last lateral line pore not reaching the tip of pectoral fin. Cephalic lateral-line system, with 7 – 8 supraorbital, 4 + 11 infraorbital canal pores, 5 supratemporal canal pores, with 6 – 7 preoperculo-mandibular canal pores (Fig. 5 A 1 – A 3). Stomach U-shaped with straight intestines (Fig. 4 D). Anterior chamber covered by dumbbell-shaped bony capsule, posterior chamber well-developed, and tube connecting anterior and posterior chambers of the air bladder (Fig. 4 E). Lateral wall of the bony capsule of the swim bladder is membranous and closed posteriorly (Fig. 4 E).	en	Liao, Mei, Yu, Jing, Luo, Tao, Lan, Chang-Ting, Zhou, Jia-Jun, Xiao, Ning, Zhou, Jiang (2025): Description of a new species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution 101 (4): 1763-1774, DOI: 10.3897/zse.101.160089
0E2BA8B234B05F1CAE89A5017447D607.taxon	distribution	Distribution, habitat, and populations. Based on recent surveys, the new species Oreonectes guidongensis sp. nov. is widely distributed in streams of Fuchuan County, Hezhou City, Guangxi, China, within the Guijiang – Heijiang River basin of the Pearl River system. It is also found in Jianghua County, Yongzhou City, Hunan Province (Fig. 1). The species occurs in large populations in its known habitats and is relatively easy to collect.	en	Liao, Mei, Yu, Jing, Luo, Tao, Lan, Chang-Ting, Zhou, Jia-Jun, Xiao, Ning, Zhou, Jiang (2025): Description of a new species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution 101 (4): 1763-1774, DOI: 10.3897/zse.101.160089
