Oreonectes guilinensis Huang & Yang & Wu & Zhao 2020, sp. nov.
Creators: name: Huang, Jin-Qing
name: Yang, Jian
name: Wu, Zhi-Qiang
name: Zhao, Ya-Hui
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Cypriniformes
Nemacheilidae
Oreonectes
Oreonectes guilinensis

description: 3.1 | Oreonectes guilinensis sp. nov. (Figures 1, 2 and Table 2)
3.1.1 | Holotype
ASIZB208002, 66.3 mm standard length (L S), from Xingping, Yangshuo County, Guilin City, Guangxi Zhuang Autonomous Region, China, a tributary of Lijiang river, Pearl River system (24 53 0 30.77 00 N, 110 33 0 45.62 00 E), collected in May 2016 by Jian Yang.
3.1.2 | Paratypes
ASIZB208001, ASIZB208003-208007, KIZ2016007378, 51.9 – 73.0 mm L S; data as for holotype.
3.1.3 | Diagnosis
The new species is distinguished from other species of the genus Oreonectes. by the combination of following characteristics: caudal fin rounded; pelvic fin short, with a short distance to anus, body (except head) completely covered by scales; lateral line incomplete, with 4 – 6 pores; body width (W B) 14.8% – 16.4% L S (v. 8.8% – 12.3% in congeners); body yellowish-brown, with a dark brown lateral stripe on the flank. Two chambers of air-bladder, posterior chamber developed, filling body cavity, connected with anterior chamber by a long, slender tube.
3.1.4 | Description
Body elongate and cylindrical, with depth decreasing from dorsal-fin origin to caudal-fin base. Head slightly depressed and flattened, width greater than depth. Snout round, snout length shorter than postocular head length. Mouth inferior, curved. Upper and lower lips smooth. Three pairs of barbels: inner rostral extending anterior margin of eye, outer rostral and maxillary barbels extending over posterior margin of eye. Nostrils separate with a short distance. Anterior nostril in a short tube, which extend into a short barbel. Eyes normal.
Dorsal-fin rays ii-6, pectoral-fin rays i-9-10, pelvic-fin rays i – 6, anal-fin rays iii – 5, caudal fin branched 13 – 14. Dorsal fin short, origin closer to caudal-fin base than to snout tip, posterior to pelvic-fin origin, distal margin round. Pectoral fin almost reaching half distance to pelvic fin. Pelvic fin with a short distance (2.5 to 4 mm) to anus. Anal fin origin next to anus with a short distance. Caudal fin rounded. Caudal peduncle without adipose crests along both dorsal and ventral sides. Vertebra 4 + 33 – 36.
Except head, body completely covered by scales; lateral line incomplete, with 4 – 6 pores; cephalic lateral-line system, with 6 – 9 supraorbital, 4 + 5 – 9 infraorbital pores, 3 – 4 canal pores, with 3 – 7 preoperculo-mandibular canal pores. Two chambers of air-bladder, posterior chamber developed, filling body cavity, connected with anterior chamber by long, slender tube (Figure 3).
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3.1.5 | Coloration
Body yellowish-brown with a dark brown lateral stripe on flank, many irregularly shaped speckles, anal-fin hyaline, other fins with irregularly black dots (Figure 2). Colour in alcohol similar to life colour, except body a uniform dull yellow, turn into pale brown over time (Figure 1).
3.1.6 | Distribution
This new species is only found Shigumen village Xingping town Yangshuo County, Guilin City, Guangxi Zhuang Autonomous Region of southern China (24 53 0 30.77 00 N, 110 33 0 45.62 00 E; Figure 4).
3.1.7 | Etymology
The species name derives from the Chinese name Guilin, the name of the city where the specimens were collected.
3.1.8 | Genetic comparisons
The molecular phylogenies from the ML analyses (Figure 5) show that Oreonectes guilinensis sp. nov. and the type species O. platycephalus form a monophyletic group with strong support (100 bootstrap), sister to the Lefua clade. Interestingly, these controversial species including Oreonectes shuilongensis Deng, Xiao, Hou & Zhou 2016, Oreonectes daqikongensis Deng, Wen, Xiao & Zhou 2016 and Oreonectes jiarongensis (Lin, Li & Song 2012) were resolved in a well-supported clade with Troglonectes furcocaudalis (Zhu & Cao 1987) (100 bootstrap). On this basis, as well as morphological comparisons, we are confident in assigning the new species to the genus Oreonectes.
description: Published as part of Huang, Jin-Qing, Yang, Jian, Wu, Zhi-Qiang & Zhao, Ya-Hui, 2020, Oreonectes guilinensis (Teleostei, Cypriniformes, Nemacheilidae), a new loach species from Guangxi, China, pp. 111-119 in Journal of Fish Biology 96 (1) on pages 112-116, DOI: 10.1111/jfb.14191, http://zenodo.org/record/10981618