« Anal sinus obsolete; shell small in size, mitriform, with long narrow aperture, thick in substance; species few in number, recent in development. » – T. L. Casey: “Notes on the Pleurotomidae with description of some new genera and species”, Transactions of the Academy of Science of St. Louis vol.14, Saint-Louis 1904, p.126.
 

« The shell is oval or fusiform, moderately thick in substance, closely, spirally nodulose in sculpture, having the aperture oblique, narrowly oval, nearly half as long as the shell and completely undifferentiated from the extremely short canal. The anal sinus is small but distinct and abruptly formed; it is but slightly everted from the axial line of the aperture, though separated from the suture by a thickened callus. The outer lip is not dilated and is non-plicate. Columella with about two broadly tumid oblique and approximate folds at the middle. The spire is half as long as the shell, with its outline even in profile from whorl to whorl, and without break due to individual convexity of the whorls, the side profile of each whorl very feebly arcuate, the sutural breaks in the curve of profile narrow; each whorl with about three very broad approximate spiral lyrae, forming moderately elevated tubercles or nodules on the numerous approximate ribs; pillar not differentiated, the base of the shell obconic. The embryo is smooth, of between one and two whorls, very broadly and obliquely obtuse at apex in profile, the summit concave, the nucleus extremely small. Body whorls three to four in number. » – T. L. Casey: op. cit. p.167-168 about the genus Helenella. The different species that are present in Mediterranean can share some habitat (Amati, Smriglio & Oliverio: “Revision of the Recent Mediterranean species of Mitromorpha Carpenter, 1865 (Gastropoda, Conoidea, Mitromorphidae) with the description of seven new species”, Zootaxa 3931 (2), march 2015, p.159.