Clausilia dubia

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropodae
Subclassis: Orthogastropoda
Superordo: Heterobranchia
Ordo: Pulmonata
Subordo: Eupulmonata
Clade: Stylommatophora
Cladus: Orthurethra
Informal group: Sigmurethra
Superfamilia: Clausilioidea
Familia: Clausiliidae
Subfamilia: Clausiliinae
Tribus: Clausiliini
Genus: Clausilia
Subgenus: Clausilia (Clausilia)
Species: C. (C.) dubia

Clausilia dubia is a species of small, very elongate, left-handed air-breathing land snail, a sinistral terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails, all of which have a clausilium.
Distribution

The species occurs in Europe, living in countries and islands including:

* Great Britain, the north of England
* Czech Republic
* Slovakia

Description

All the species of snails in the family of door snails are left-handed, which is an uncommon feature in gastropods in general. These snails have shells which are extremely high-spired, with numerous whorls.

Clausilia dubia is a relatively large species for this family, reaching 16 mm in height.

The weight of the adult live snail is about 122.5 mg.[2]
References

1. ^ 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. cited July 7 2007.
2. ^ Boch S., Prati D., Werth S., Rüetschi J. & Fischer M. (2011). "Lichen Endozoochory by Snails". PLoS ONE 6(4): e18770. doi:10.1371/journal.pone.0018770.