Key to the Japanese species of Clorida and Cloridina in this study

1. Second segment of A2 peduncle not extending anteriorly beyond eye (Fig. 9A). Posterior half of proximal segment of uropodal exopod black (Fig. 9G)................................................... Cloridina ichneumon (Fabricius, 1798)

- Second segment of A2 peduncle clearly extending anteriorly beyond eye (e.g. Fig. 1B)………………………… Clorida .... 2

2. Mandibular palp (e.g., Fig. 5F) present.................................................................... 3

- Mandibular palp absent................................................................................ 5

3. Carapace anterolateral spines minute or absent (Fig. 5A–C). Telson teeth short, rounded (Fig. 5M, N)............................................................................................... C. rotundicauda (Miers, 1880)

- Carapace anterolateral spines distinct. Telson teeth relatively long, sharp......................................... 4

4. Raptorial claw dactylus with basal notch on extensor margin (Fig. 1D). TS5 lateral process forming acute spine (Fig. 1E)....................................................................... C. albolitura Ahyong & Naiyanetr, 2000

- Raptorial claw dactylus without basal notch on extensor margin (Fig. 2E). TS5 lateral process with triangular lobe (in posterior view) (Fig. 2F).................................................................. C. japonica Manning, 1978

5. Raptorial claw dactylus with 3 or 4 teeth (if 4 teeth present, proximalmost tooth minute) (Fig. 3E, F). A2 scale black (Figs. 3A, 4)................................................................... C. denticauda Garcia & Manning, 1982

- Raptorial claw dactylus with 4 well-formed teeth (Fig. 7E).................................. C. seversi Moosa, 1973