Tropidofusus ypotethys: a new genus and new species of Columbariidae (Mollusca: Gastropoda: Turbinelloidea)

ABSTRACT

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

KEYWORDS:

• Abyssal
• bathyal
• biogeography
• Coluzea
• Fulgurofusus
• molecular phylogeny
• Neogastropoda

Acknowledgements

I thank Bruce Marshall, Museum of New Zealand Te Papa Tongarewa, for making available on loan the type series on which this study is based, and for allowing the dissection of the tissues. Yolanda Villacampa of the National Museum of Natural History, Smithsonian Institution, assisted in producing the scanning electron micrographs.

Disclosure statement

No potential conflict of interest was reported by the author

ORCID

M. G. Harasewych http://orcid.org/0000-0002-3354-8545