First record of the four-pore slender giant moray, Strophidon tetraporus (Actinopterygii, Anguilliformes, Muraenidae), from Sinan, Korea

A single individual (2318 mm total length) of Strophidon tetraporus Huang et Liao, 2020 was collected from Heuksan-myeon, Sinan-gun, Jeollanam-do, Korea, in December 2023. This species is characterized by the following morphological traits: elongated body, biserial maxillary and dentary teeth, four infraorbital pores, 195 vertebrae (8 predorsal, 79 preanal), and continuous dorsal, anal, and caudal fins. Genetic analysis of the cytochrome oxidase subunit I ( COI ) sequences confirmed its identity, with only 0.02–0.03 percentage-point divergence from the type specimens of S. tetraporus . This record represents the first verified occurrence of S. tetraporus in Korean waters and extends the species’ distribution to its northernmost limit.