Hoplophrys is a monotypic genus of crab in the family Epialtidae.

[1][2][3][4] Hoplophrys oatesii is a very colorful crab that grows from 1.5 to 2 cm (0.59 to 0.79 in).

It lives on various species of soft coral in the genus Dendronephthya.

The body has pointed spines with a red and white pattern, similar in appearance to the host coral.

It is found in the benthic zone at depths of 1–90 metres (0–300 ft).