Zoologische Mededelingen, 82 (June 2008)M. deMaintenon: Results of the Rumphius Biohistorical Expedition to Ambon (1990).
Columbellids collected by the 1990 expedition

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Graphicomassa Iredale, 1929

This is often considered a subgenus of Mitrella. According to Wilson (1994), Iredale (1929) gave no diagnosis for the genus, so the diagnosis provided is based on the type species. The shell is tall spired, fusiform, and porcelainous, with a thick parietal callus and a weak columellar groove. The base is less constricted than in most species traditionally placed in Mitrella. The type species (by original designation) is Graphicomassa ligula (Duclos, 1840), a sand dweller on coral reefs.

FIG2

Figs 8-15, Columbellidae. Scale bars are 1 mm. 8, Graphicomassa albina (Kiener, 1841), Stn. 5. 9, Graphicomassa ligula (Duclos, 1840), Stn. 30. 10, Indomitrella conspersa (Gaskoin, 1851), Stn. 30. 11, Indomitrella cf. shepmani (K. Monsecour & D. Monsecour, 2007), Stn. 23. 12, Indomitrella puella (Sowerby, 1844), Stn. 35. 13, Lavesopus cumingii (Reeve, 1859), Stn. 27. 14, Metanachis jaspidea (Sowerby, 1844), Stn. 17. 15, Metanachis laingensis (Sleurs, 1985), Stn. 23.