4. Argathona japonica Shiino, 1961 .

Okinoyama, Japan; 85–95 metres. Although Shino (1961) included Richardson (1910) in the references there is no text reference to that publication, nor was there a direct comparison of A. japonica to Argathona setosa Richardson, 1910 . The general setosity and specifically the falcate shape of the uropodal endopod agrees with that of A. setosa, and the possibility must be considered that the two species are the same.