First description of the male of Eragia profunda Markham, 1994 (Crustacea: Isopoda: Bopyridae), with comments on relationships in the subfamily Argeiinae

The male of Eragia profunda Markham is described for the first time. The only known host of this species is Prionocrangon paucispina Kim & Chan and parasitized hosts have been collected from New Caledonia and Taiwan in 2100–2543 m depth. Morphology of the male and female parasites indicates that the species belongs to a group of argeiine bopyrids consisting of Argeia, Parargeia, Eragia, and Stegoalpheon.