| Summary: | Platytyphlops sarahae n. sp. is described based on specimens collected in the Mar del Plata submarine canyon and on the slope of the Namuncurá-Burdwood Bank. P. sarahae n. sp. is closely related to the Antarctic species Platytyphlops asperus, from which it can be easily separated by the telson having a central distal seta distinctly shorter than the other two. The presence of a rudimentary squama (exopod) on the second antenna of the male is reported for the first time for the family, and for the second time for the order Cumacea. With the aim of improving the taxonomic work and facilitating future phylogenetic analyses in the family Lampropidae, remarks on the second antenna of the male, the eyelobe and the pseudorostrum are presented. Fil: Roccatagliata, Daniel Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina
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