Clausilia bidentata

Clausilia bidentata, the two-toothed door snail, is a species of door snails, terrestrial pulmonate gastropod mollusks in the genus Clausilia belonging to the family Clausiliidae, all of which have a clausilium.

Clausilia bidentata
Clausilia bidentata var. crenulata
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Superfamily:
Clausilioidea
Family:
Clausiliidae
Genus:
Clausilia
Species:
C. bidentata
Binomial name
Clausilia bidentata
(Strøm, 1765)
Synonyms
  • Turbo Bidentatus Strøm, 1765[2]
  • Clausilia nigricans Maton & Rackett, 1807

Subspecies
  • Clausilia bidentata abietina Dupuy, 1849
  • Clausilia bidentata bidentata (Ström, 1765)
  • Clausilia bidentata crenulata Risso, 1826
  • Clausilia bidentata moniziana Lowe, 1852

Distribution

This species is present in much of western Europe,[1] including:

Habitat

This species is commonly found under bark of trees or in crevices of rocks. The snails are often encountered when they are most active, at night during wet weather, at which time they often climb up trees and feed on lichens.

Description

The shell of this snail is a small and cylindrical snail, very high-spired and narrow. The shell length reaches 10–11 millimetres (0.39–0.43 in). The shell is dark brown with noticeable spiral ribs, slight longitudinal grooves, and a horny operculum.

Clausilia bidentata var. crenulata – Close-up
Lateral view of the shell of Clausilia bidentata crenulata.
Clausilia bidentata var. crenulata.
Clausilia bidentata var. crenulata, close-up.

References
  1. Seddon, M.B. (2017). "Clausilia bidentata". IUCN Red List of Threatened Species. 2017: e.T171591A1328595. doi:10.2305/IUCN.UK.2017-3.RLTS.T171591A1328595.en.
  2. Strøm, H. (1765). "Beskrivelse over Norske insecter, første stykke". Det Trondhiemske Selskabs Skrifter. 3: 376–439, Tab. VI.
  • Anderson, R. 2005, An Annotated List of the Non-Marine Mollusca of Britain and Ireland, Journal of Conchology, London, 38: 607-638
  • Kerney, M, 1999, Atlas of the Land and Freshwater Molluscs of Britain and Ireland, Harley Books, Colchester
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