Zebrida adamsii is a distinctively striped species of crab that lives in association with a sea urchin in the Indo-Pacific region.

It is cryptically coloured with vertical stripes and has special adaptations to its legs to enable it to cling to its host's spines.

[4] Sea urchins on which it has been found include Asthenosoma ijimai, Diadema setosum, Heliocidaris crassispina, Pseudocentrotus depressus, Salmacis bicolor, Salmacis virgulata, Toxopneustes elegans, Toxopneustes pileolus, Tripneustes gratilla and a species of Acanthocidaris.

[3] Adaptations for this lifestyle include a specialist joint between the propodus and dactylus on the walking legs enabling the crab to cling to its host, and cryptic colouring in the form of vertical stripes.

[4] Z. adamsii feeds on its host's tube feet and on the epidermal tissue covering the test and the base of the spines.