Vertigo ultimathule
Vertigo ultimathule is a species of minute, air-breathing land snail, terrestrial pulmonate gastropod molluscs or micromollusks in the family Vertiginidae, the whorl snails. Distribution Vertigo ultimathule is found in: Finnmark County in the river valleys of the River Tana and its tributary Anarjohka, Norway Pältsan, the very northernmost part of Sweden, The type locality is Pältsan-area, in the northernmost corner of Swedish Lapland. Occurrences are to be expected in other parts of Finnmark and adjacent parts of Finland and Sweden. It appears that Vertigo ultimathule is rare with a very limited distribution endemic to northernmost Norway and Sweden. Description Vertigo ultimathule is a medium-sized Vertigo, which reaches a height of 2.1–2.2 mm and a diameter of 1.3–1.4 mm, the number of whorls is 4.6–4.7. The shell is almost cylindrical, with marked convex whorls, which are separated by a marked, deep suture. The shape is not distinctly ovoid, as in some other Vertigo-species, and the last whorl does not narrow markedly at the base. In side view from left the outer margin of the last whorl forms a blunt angle close to the umbilicus. The aperture is completely toothless or with only a small, delicate, rather deeply set parietal denticle. The