Original taxon: Eulimella cossignanii, now corrected in cossignaniorum, in honour of «  T. Cossignani and V. Cossignani for their efforts to promote malacology by exhibition and presentation in Cupra Marittima (AP), Italy. » – J. J. van Aartsen: “European Pyramidellidae: IV. The genera Eulimella, Anisocycla, Syrnola, Cingulina, Oscilla and Careliopsis”, Bollettino Malacologico vol. 30, Milano 1994, p.91.
 
The shell of this species is very close to that of bogii, but with the whorls a little bit more convex, and a cirtoconoid shape. « The embryonic whorls are planorbid with their axis at 135° to the main shell axis. The teleconch whorls are slightly convex with a tendency to have the greatest convexity just above the lower suture; the number of whorls is about six, not counting the embryonic ones. The growthlines are slightly opisthocline and there is no spiral microsculpture. Many growthlines are crowded together in some places and form a sort of axial microsculpture. The shell looks rather solid and not very thin. The columella is straight without a fold or tooth. » – Op. cit. p.90. – Above, a specimen from 70m deep, Hvar channel, Split-Dalmatia Comitat, S. Croatia. 2,8mm. Original pictures provided by R. Stanić (HR) – (CC BY-NC-SA).

The shell of cossignaniorum differs from that of acicula by the shape of the whorls, whis are less rounded than in the latter and have their periphery more abapically placed, and by the complete absence of microspirals.