The nannastacid cumacean, Normjonesia danieli, n. g., n. sp., is described from a depth of 88 m on the Southwest Florida shelf in the southeastern Gulf of Mexico. The new genus appears to have its closest affinities with Campylaspis Sars and Cubanocuma Băcescu and Muradian, also known from the shallow waters of the Caribbean Sea. A combination of characters, including: (1) the apparent lack of terminal aesthetes on antenna 1; (2) the absence of exopods on the female; (3) the presence of 5 pairs of exopods on the male; and (4) the presence of long terminal setae on the third maxilliped, distinguishes Normjonesia from the other known genera of the family Nannastacidae.