original descriptionBouchet P. & Warén A. (1993). Revision of the Northeast Atlantic bathyal and abyssal Mesogastropoda. <i>Bollettino Malacologico supplemento 3</i>: 579-840 page(s): 652, 666 [details]
basis of recordGofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (eds), European Register of Marine Species: a check-list of the marine species in Europe and a bibliography of guides to their identification. <em>Patrimoines Naturels.</em> 50: 180-213. (look up in IMIS) [details]
additional sourceGofas S. (2007). Rissoidae (Mollusca: Gastropoda) from northeast Atlantic seamounts. <i>Journal of Natural History 41(13–16)</i>: 779–885[details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Biology Type of larval development: direct (non planktotrophic) denoted by paucispiral protoconch. [details] Diagnosis Shell 1.8-2.1 mm high, with protoconch of 1.75 whorl and teleoconch of 2.75 to 3.25 whorls. Protoconch covered by minute granules arranged in broad spiral bands, hardly appreciable under the optical microscope, teleoconch with a sculpture of elevated, widely separated axial ribs, minute spiral threads and of distinct spiral cords restricted to the abapical area. A diagnostic feature is the distinct spiral cord overhanging adapically the suture, continued on the body whorl. Outer lip thickened externally at a distance of the edge by a broad rim, then thinning out to a cutting edge; smooth inside. Shell entirely white, translucent.
Specimens from the Azores have a quite faint axial sculpture but another shell from the type locality illustrated by Bouchet and Warén (1993: fig. 1487) resembles the dominant morphology found on Atlantis seamount. Alvania adiaphoros somewhat resembles the mainland species A. electa (Monterosato, 1874) in general shape and in having a strong suprasutural cord separated from the suture by a channelled interspace. It differs in lacking distinct spirals in the adapical part of the whorls, in a lesser extension of the ribs towards the abapical part, and in being less umbilicate. The protoconch is also different, the granules tending to form definite spiral threads in A. electa. [details] Distribution Azores, in 360-914 m; Great Meteor, Hyères and Atlantis seamounts, very common in 280-480 m. Irving seamount, rare in 460-790 m. [details] Type locality off Azores (39º26'N, 31º22'W, 650-914 m) [details]