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
Subfamily: Phaedusinae
Tribe: Phaedusini
Genus: Stereophaedusa
Species: Stereophaedusa japonica
Subspecies: S. japonica perobscura
Kitakyushu, Fukuoka, Kyushu, Japan
Clausiliidae, also known by their common name the door snails, are a taxonomic family of small, very elongate, mostly left-handed, air-breathing land snails, sinistral terrestrial pulmonate gastropod mollusks.
Most species of Clausiliidae have an anatomical structure known as a clausilium, which enables the snail to close off the aperture of the shell with a sliding “door”.
via Flickr https://flic.kr/p/2gQVYcH