Abstract
Four specimens of the five-gilled white mid-dorsal line hagfish, Eptatretus wandoensissp. nov. were recently collected from the southwestern Sea of Korea (Wando). This new species has five pairs of gill apertures, 14–18 prebranchial slime pores, 4 branchial slime pores, a dark brown back with a white mid-dorsal line and a white belly. These hagfish are similar to Eptatretus burgeri and Eptatretus minor in having a white mid-dorsal line, but can be readily distinguished by the numbers of gill apertures (5 vs. 6–7), gill pouches (5 vs. 6), and prebranchial slime pores (14–18 vs. > 18), as well as the body color (dark brown back vs. gray or brown pale). In terms of genetic differences, Eptatretus wandoensis could be clearly distinguished from E. burgeri (0.9% in 16S rRNA and 8.5% in cytochrome c oxidase subunit I sequences) and E. minor (4.5% and 13.9%).
Highlights
Myxinidae are currently classified into six genera and 81 species worldwide (Fernholm et al 2013; Froese and Pauly 2019)
We examined the anatomical characters such as the arrangement between gill pouch (GP) and efferent branchial duct (EBD)
Eptatretus wandoensis sp. nov. is one of many new hagfish species recently discovered in the northwest Pacific Ocean
Summary
Myxinidae (hagfishes) are currently classified into six genera and 81 species worldwide (Fernholm et al 2013; Froese and Pauly 2019). They are characterized by an eel-like body shape and 1–16 pairs of gill apertures and gill pouches; they. Recent research using morphological and molecular characteristics revealed that hagfishes comprise three subfamilies: Eptatretinae, Myxininae, and Rubicundinae (Fernholm et al 2013). Based on examinations of both morphological and genetic characteristics of hagfish specimens from the southwestern Sea of Korea, we describe a new species, Eptatretus wandoensis sp. Based on examinations of both morphological and genetic characteristics of hagfish specimens from the southwestern Sea of Korea, we describe a new species, Eptatretus wandoensis sp. nov., and compare it with other members of the Eptatretus genus in around northeastern Asia
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