"The foot is large, broad, rounded behind and but slightly longer than shell, divided across the middle by a dark line; propodium relatively small, narrow; head concealed, bearing no tentacles or eyes. Radular ribbon very long, with numerous rows of teeth, the rachidian tooth tricuspidate and with small denticles on the sides. Shell often large, generally with a pointed or tapered spire, channelled sutures and no surface glaze. The body-whorl is large, spindle-shape, the outer lip thin, somewhat sinuous with a small bulge below, the pillar with several descending plaits, the parietal wall smooth, unglazed. Fasciole wide and more heavily colored than the surface above.".
This subfamily was confirmed as being valid by Kantor et al. (2017). However, the phylogenetic analyses run for this paper included two Anazola, rather than any of the species of the name-giving genus Agaronia. In the above-mentioned paper, Anazola and Utriculina are considered to be junior synonyms of Agaronia. Both genus-group taxa are here considered to be distinct and valid genera.