Porcellana sayana is found along the western coast of the Atlantic Ocean, from Cape Hatteras (United States) to Brazil, including the Gulf of Mexico and the Caribbean Sea.

[2] Porcellana sayana is 13 millimetres (0.51 in) long,[3] and is red, with numerous whitish spots.

[4][2][5] It may be distinguished from other species by the form of the first pereiopod; the carpus (last segment before the claw) of that leg bears a lobe which projects forwards.

[4] Porcellana sayana lives in shallow water, at depths of up to 92 metres (302 ft), among rocks and oyster shells, or as a commensal of the hermit crabs Pagurus pollicaris and Petrochirus diogenes.

[6] Its common names include "spotted porcelain crab"[2] and "Say's porcellanid".