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A new amphipod species of the genus    Elasmopus    Costa, 1853 is described and illustrated based on material collected in a harbor on the northern Yucatan coast, southern Gulf of Mexico.    Elasmopus   yucalpeten    sp. n. is recognized from its congeners by a two-articulate accessory flagellum, a group of long robust setae on the anterodistal margin of the gnathopod 2 basis, a distomedial concave portion on palm of gnathopod 2 propodus, long setae on basis posterior margin of pereopods 5–7, and an entire telson. The differences among closely related species are pointed out and they are compared with the new species. An identification key to species of the genus    Elasmopus    in the Gulf of Mexico and biogeographic comments at the regional and global scales are also provided.

zoosystematics and evolution

Elasmopus   yucalpeten    sp. n. (  Crustacea  ,   Amphipoda  ,   Maeridae  ) from the northern Yucatan coast, with a key for the genus in the Gulf of Mexico and biogeographic comments