A new species of the shrimp genus Lysmata Risso, 1816 (Crustacea, Decapoda) from Guam

A new species of hippolytid shrimp, Lysmata guamensis n. sp., is described based on a single specimen collected in the shallow waters of Guam, the largest island of the Mariana Archipelago in the tropical western Pacific Ocean. The new species differs from all the other species of Lysmata by the presence of only two teeth on the mid-dorsal line of the carapace, one of which is posterior to the orbital margin. It also has unusually slender, elongate walking legs. An annotated table of all presently known species of Lysmata is provided.