Body short, narrowing sharply posteriorly. Relatively more slender appendages than in Munna kroyeri ; antenna 2 almost twice the length of the body. Eyes on lateral extensions of the head. Molar process of the mandible normal in structure, strongly developed with a truncate, denticulate grinding apex. Pereion segments 5 to 7 much smaller than segments 1 to 4 and sharply marked off from them; pereiopods relatively robust. Pleotelson with no more than one large spine on the lateral borders; postero-lateral borders serrated. Uropods small, lacking a peduncle, but with a distal, inward pointing, hooked process. Pleopod 1 of females absent, pleopod 2 forming a plate-like operculum; male pleopod 1 forming a copulatory preoperculum contributed to by pleopod 2.
Females scarcely reaching 3 mm body length; males smaller.
Predominantly sublittoral, among sessile coelenterates, polyzoans, Laminaria holdfasts, etc., but also recorded at LWS.
Recorded off most British coasts and Greenland, North America, Iceland, Spitzbergen and Norway.