Leach, 1817
Carapace subtriangular to pyriform; upper orbit lacking a postorbital lobe or spine, eyestalk retracting against hepatic margin. Eyestalk fully movable, cornea not particularly small. Distal margin of basal antennal article overreaching anterior margin of eyestalk, green (antennal) gland distinct and more or less distant from junction of basal antennal article and epistome. Epistome in the same plane as the basal antennal article. Third maxilliped with merus narrower than ischium. Ambulatory legs very slender and usually three to five times carapace length. Third segment of male abdomen not noticeably longer than fourth and fifth segments, smooth or sometimes with spinules on inflated lateral surfaces, without a transverse ridge. (Türkay 1995)
Type species: Achaeus cranchii Leach, 1817, by monotypy.
Gender masculine.
Species treated:
Achaeus akanensis Sakai, 1938
Achaeus boninensis Miyake & Takeda, 1969
Achaeus brevidactylus Sakai, 1938
Achaeus brevifalcatus Rathbun, 1911
Achaeus curvirostris (A. Milne Edwards, 1873)
Achaeus japonicus de Haan, 1839
Achaeus lacertosus Stimpson, 1857
Achaeus pugnax (de Man, 1928)
Achaeus robustus Yokoya, 1933
Achaeus serenei Griffin & Tranter, 1986
Achaeus spinosus Miers, 1879
Achaeus superciliaris (Ortmann, 1893)
Achaeus trituberculatus Rathbun, 1894
Achaeus tuberculatus Miers, 1879
Achaeus varians Takeda & Miyake, 1969
Achaeus villosus Rathbun, 1916