The genus Tripidofusus n. gen. is proposed to include Tropidofusus ypotethys n. sp. from bathyal depths off New Zealand, as well as Fulgurofusus aequilonius and Columbarium benthocallis from the abyssal zones of the Bering Sea and Scotia Sea, respectively. Tropidofusus can be distinguished from both Fulgurofusus and Coluzea on the basis of its lower spire, prominent peripheral keel, long, thin siphonal canal, as well as in having a much thinner shell that lacks axial sculpture. The type species, Tropidofusus ypotethys n. sp., differs from its congeners in having a broader peripheral keel, smaller aperture and longer siphonal canal, as well as by inhabiting bathyal rather than abyssal depths. The genus is reviewed and the relationships of Tropidofusus to other supraspecific taxa within Columbariidae are discussed, as are relationships among the families within Turbinelloidea.http://www.zoobank.org/urn:lsid:zoobank.org:pub:3CA568AD-1B6F-4D4E-9DF7-8377CABB8553
