What is "ilbiidae"

Ilbiidae is a family of marine opisthobranch gastropod mollusks in the clade Cephalaspidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. There are two genera, Ilbia, with two species (Australia, Marianas), and Pseudoilbia, with one poorly known species from New Zealand.