Vertigo ultimathule
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| Vertigo ultimathule | |
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| Apertural view of the shell of the holotype of Vertigo ultimathule | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Vertiginidae |
| Subfamily: | Vertigininae |
| Genus: | Vertigo |
| Species: | V. ultimathule |
| Binomial name | |
| Vertigo ultimathule von Proschwitz, 2007[2] | |
| Synonyms | |
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Vertigo (Boreovertigo) ultimathule von Proschwitz, 2007 alternate representation | |
Vertigo ultimathule is a species of small, air-breathing land snail, terrestrial pulmonate gastropod molluscs or micromollusks in the family Vertiginidae, the whorl snails.[3]
Vertigo ultimathule is found in:
- Finnmark County in the river valleys of the River Tana and its tributary Anarjohka,[4] Norway[1]
- Pältsan, the very northernmost part of Sweden,[1][4]
The type locality is Pältsan-area, in the northernmost corner of Swedish Lapland.[4]
Occurrences are to be expected in other parts of Finnmark and adjacent parts of Finland and Sweden.[4] It appears that Vertigo ultimathule is rare with a very limited distribution endemic to northernmost Norway and Sweden.[4]
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.[4] 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 mouth-edge is simple and scarcely thickened. The colour of the shell is light yellow – dark yellow-brown. The surface is glossy, with marked, but irregular, rather coarse striation.[4]
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