Halicyclops caneki n. sp. is described from Celestun Lagoon (northwest of the Yucatan Peninsula) and is compared with its congeners H. herbsti Rocha and Iliffe, and H. bowmani Rocha and Iliffe, known from the Bermuda cave system. H. magniceps previously reported from the peninsula is considered as a possible junior synonym of H. caneki. The new species was found among several other copepods living between the aufwuchs covering submerged mangrove pneumatophores
