Trissexodon constrictus

Trissexodon constrictus
Apertural view of the shell of Trissexodon constrictus. Scale is in mm.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Superfamily: Helicoidea
Family: Trissexodontidae
Genus: Trissexodon
Species: T. constrictus
Binomial name
Trissexodon constrictus
(Boubée, 1836)[2]
Synonyms

Helix constricta Boubée, 1836

Trissexodon constrictus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Trissexodontidae.

Trissexodon constrictus is the type species of the genus Trissexodon.

Distribution

This species is found in France and Spain: from the western Pyrenees to Biscay.[3] It is an endemic species of the western Pyrenees.[3]

Description

The shell is finely and regularly ribbed. It is strongly depressed on the upper side. The lower side is rounded. The shell has 5-6 whorls. The aperture has a characteristic shape. The lip is reflected and forms a "U" shape when seen from above. The umbilicus is deep and covers 1/7 of the shell diameter.[3]

The width of the shell is 6–8 mm; the height of the shell is 3–4 mm.[3]

Ecology

Trissexodon constrictus is found under stones in the soil of humid and shady forests, also between moss and under leaves, from sea level to 800 m, exceptionally to altitudes of 1500 m.[3]

References

This article incorporates public domain text from the reference [3]

  1. ↑ Gómez Moliner, B.J. (2011). "Trissexodon constrictus". The IUCN Red List of Threatened Species. IUCN. 2011: e.T22206A9364489. doi:10.2305/IUCN.UK.2011-1.RLTS.T22206A9364489.en. Retrieved 14 December 2017.
  2. ↑ Boubée N. (1836). "Hélice nouvelle. [Helix constricta]". L'Echo du Monde Savant et l'Hermes 3(191): 220. Paris.
  3. 1 2 3 4 5 6 "Species summary for Trissexodon constrictus". AnimalBase, last modified 26 September 2008, accessed 12 January 2011.
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