Abstract
The whitish hagfish, Eptatretus albiderma sp. nov., was collected from the northeast Sea of Vietnam (Da Nang). This new species possesses six pairs of gill apertures, three multicusps, 18–21 prebranchial slime pores, absent or one branchial slime pore, and whitish to pinkish body color. Eptatretus albiderma sp. nov. can be readily distinguished from Eptatretus atami (Dean, 1904) and Eptatretus sheni (Kuo, Huang & Mok, 1994) by the numbers of total cusps (41–43 vs. 47–52 in E. atami vs. 48–53 in E. sheni), body color (whitish vs. darkish in E. atami vs. dark brown dorsally, lighter ventrally in E. sheni), eyespots (absent or faint vs. prominent in E. sheni), and total slime pores (74–78 vs. 71–78 in E. atami vs. 62–74 in E. sheni). The new species is clearly distinguished from E. atami by 0.026 pairwise genetic distance (d) of phylogeny based on mtDNA COI. We herein offer the key to 17 species of the genus Eptatretus Cloquet, 1819 in East Asia.
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