Munna are small species with short bodies, wider at the head end. The antennae are as long or longer than the body, and the eyes are situated on lateral projections. Pereon segments 5 to 7 are small. The first pair of legs are smaller and are held under the body, the other pairs of legs are long. Uropods are small.
M. minuta (females up to 3 mm, males smaller) has long antennae (almost twice the body length) and slender legs compared to M. kroyeri. There is at most a single large spine on each edge of the pleotelson, the rear margin of which is finely serrated.
Distribution and Habitat
Mainly a sublittoral species, but occasionally recorded at extreme low tide amongst bryozoans, coelenterates, Laminaria holdfasts, etc.
Naylor, E. & A. Brandt. 2015. Intertidal Marine Isopods. Synopses of the British Fauna (New Series), No. 3. Field Studies Council, for The Linnean Society of London.