Gelasimus vocans is a species of fiddler crab. It is found across the Indo-Pacific from the Red Sea, Zanzibar and Madagascar to Indonesia and the central Pacific Ocean.[1] It lives in burrows up to deep.[1] Several forms of G. vocans have been recognised, with their authors often granting them the taxonomic rank of full species or subspecies.[2]
Gelasimus vocans was formerly in the genus Uca, but in 2016 it was placed in the genus Gelasimus, a former subgenus of Uca.