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. kroyeri has antennae which are roughly the same length as the body, with the peduncle being longer than the flagellum. It has two to six large spines on each side of the pleotelson. Females up to 3 mm, males up to 1.7 mm.
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.