General description:
This is a clade with poor congruence between molecular and shell characters. The contents of most genera need revision and the family limits remain uncertain.
Diagnostic description:
From Bouchet et al. 2011: Shell of moderate size, about 20–30 mm, up to 100 mm high, high-pagodiform to fusiform, with a tall spire and usually a long siphonal canal. Axial sculpture poorly developed or absent, subsutural ramp usually smooth. Anal sinus deep, on subsutural ramp. Protoconch paucispiral, smooth.
In living taxa:
Operculum with terminal nucleus. Radula 1–0-R-0 –1. Rachidian broad, subrectangular or arched, with a single rather large cusp , rarely absent. Marginal teeth duplex, with well developed accessory limb.
Taxonomic name: