Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

[2] The thin, translucent, white shell has a trochiform shape.

The outer lip has characteristically one to three concave notches (except in the genus Guttula).

The rhipidoglossan radula has intermediate characteristics of the former order Archaeogastropoda (by having more than two pairs of marginal teeth) and the former order Mesogastropoda (by having a single pair of lateral teeth).

[2] This family consists of four following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005) with the following genera [3]