Thirty antennal rings, each with single row of bristles. Male with an eversible head structure consisting of dome-shaped, fleshy crown. Distal half of the crown has rounded, scaled papillae mediodorsally. Proximal part of crown unpigmented, with scattered, pigmented papillae. When inverted, the structure forms a depression, or pit. Female head papillae modified, reduced in size and crowded together in shallow pit. Fifteen pairs of oncopods in both sexes. Crural papillae present only on first pair, or first two pairs, of oncopods. Repeated Y-shaped segmental body pattern. Up to about 2 in (50 mm) in length, with females larger than males.
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