As a part of ongoing efforts for monitoring benthic ecosystem in the Gulf Mexico, Harpacticoid copepods were collected from southwestern Mexico. Among them we report three new species Zosime, and Peresime study area. Zosime is most specious-rich genus family. Three morphologically similar to Z. paratypica Becker Schriever, 1979, atlantica Bodin, 1968, destituta Kim J.G., Jung Yoon, 2016, respec...