Ichthyology and Molecular Systematics Research Laboratory, Zoology Section, Department of Biology, School of Science, Shiraz University, Shiraz, Iran..
2Department of Marine Science and Fisheries, Sultan Qaboos University, P.O Box 34 Al Khod 123 Muscat, Oman..
Zootaxa. 2022 Sep 7;5182(4):361-376. doi: 10.11646/zootaxa.5182.4.3.
Oxyurichthys omanensis sp. nov. is described as a new gobiid species from a mudflat/estuary habitat in northern Oman. The new species is diagnosed among all currently recognised congeners by the following combination of character states: elongate tentacle on dorsoposterior surface of the eye; nape with well-developed membranous crest; nape scaled to above anterior half of opercle along sides with naked median along membranous crest, scales never reaching to above preopercle; opercle and pectoral base naked; scales ctenoid laterally on trunk posterior to base of second dorsal fin 3rd element; lateral scale rows 5158, usually 5156; transverse forward scale rows 2329, usually 2428; transverse rearward scale rows 1416, usually 1415; upper lip usually constricted at premaxillary symphysis; infraorbital transverse papillae row 2 reaching eye margin dorsally and markedly short of longitudinal row d ventrally; additional short transverse papillae rows between rows 2 and 3i present; dark saddle present over caudal peduncle; snout length 34.945.4% HL; second dorsal-fin longest ray 1.11.6 head depth; pelvic fin always reaching or passing anal-fin origin. The K2P genetic distances (%) in the mtDNA COI barcode region between O. omanensis and the other Oxyurichthys species were all high (11.230.6%) with the K2P nearest neighbor distance of 11.2% to O. cornutus and O. ophthalmonema.
奥氏异须鲇是一种新的虾虎鱼物种，分布于阿曼北部的泥滩/河口生境。该新种与所有目前公认的近缘种的区别在于以下特征组合：眼后背部有细长触须；颈背有发达的膜嵴；颈背鳞片延伸到侧线，沿膜嵴裸露，鳞片从不超过前鳃盖；鳃盖和胸鳍基部裸露；体侧后部第二背鳍第三鳍条基部的栉鳞呈侧扁形；侧线鳞 51-58 行，通常为 51-56 行；横向前鳞列 2-3 行，通常为 24-28 行；横向后鳞列 1-4 行，通常为 14-15 行；上唇通常在颌骨联合处收缩；眶下横乳突列 2 条，向上达背缘，明显短于腹缘的纵列 d；列 2 和 3i 之间存在额外的短横乳突列；尾柄上有深色鞍斑；吻长占头长的 34.9-45.4%；第二背鳍最长鳍条长为头高的 1.1-1.6 倍；臀鳍总是达到或超过肛门鳍起点。mtDNA COI 条码区 O. omanensis 与其他 Oxyurichthys 种之间的 K2P 遗传距离（%）均较高（11.2-30.6%），与 O. cornutus 和 O. ophthalmonema 的最近邻距离为 11.2%。
