[4] It has a broadly subquadrilateral carapace which grows to about 90 millimetres (3.5 in) wide,[3] and has finely punctulated by the anterior and antero-lateral borders.

[5] It normally has an orange spot in the centre of the carapace, often with two small, white 'eyes' within.

[5] The type locality for this species is Japan, and it can be found around many of the Japanese islands.

It also occurs in the waters of Taiwan,[5] Singapore, and rarely in the Lakshadweep Islands and Gulf of Mannar.

[4] This species lives on coral reefs and rocky beaches at a range of 3–30 m (10–100 ft) in depth.