Deep-water Triphoridae from the spanbios expedition to New Caledonia, with the description of the new genus Pseudomastoniaeforis and two new species (Gastropoda: Triphoroidea)

Deep water triphorids are little known, especially when it comes to the understudied fauna of the Indo-Pacific. Specimens collected during the Spanbios expedition to New Caledonia come from deep water and show a low diversity in comparison to shallow water triphorids. Here we take a close look at a new extraordinary genus of deep-water triphorids from the Spanbios expedition with two new species. We discuss its relationship to the genera Mastoniaeforis Jousseaume, 1884 and Iniforis Jousseaume, 1884 and the Newtoniellidae, the latter a group within the Triphoroidea for which the higher taxonomic classification is still in doubt.