Rissoellidae are a family of minute sea snails, marine gastropod molluscs in the order Heterostropha.
World-wide but sporadic.
These shells are minute, fragile, glass-like, of simple elongate-ovate shape, found mostly living on seaweed
. The animal is distinctive in having a pair of tentacle-like processes, additional to a pair of true tentacles. The eyes are in the middle of the bases of the tentacles. The operculum
is basically oval, but shaped to fit the aperture
, and there is a moderate to strong medial peg that is buttressed on the inner face. The radula
is variable, and the teeth are relatively large, a central, a lateral, and one, two, or no marginals.
Genera within the family Rissoellidae