See text Lamellariidae d’Orbigny, 1841 Velutinidae is a family of small sea snails, marine gastropod molluscs in the clade Littorinimorpha.

[4] The shell of these animals is very thin and delicate, and internal, completely covered by the mantle (which has fused lobes) so the appearance of these animals more closely resembles that of dorid sea slugs rather than sea snails, but anatomically quite different.

The ventral surface features a distinct foot and a head bearing tentacles with basal eyes.

The anterior of the dorsal surface (notum) is indented along the midline, forming a short siphon.

This colouration is variable, resembling that of the ascidian prey on which they live and feed and thus providing camouflage.