Trissexodon constrictus

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

Trissexodon constrictus
Apertural view of the shell of Trissexodon constrictus. Scale is in mm.

Least Concern  (IUCN 3.1)[1]
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 the type species of the genus Trissexodon.

Distribution

This species endemic to the western Pyrenees and the Basque Country across 29 recorded localities, being recorded in Spain (throughout the Basque Mountains) and in France (in the Department of Hautes Pyrénées to Department of Pyrénées-Atlantiques), (under records of the IUCN).[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.[4]

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

Ecology

Trissexodon constrictus is found under stones in the soil of humid and shady deciduous forests, between moss, under leaf litter and occasionally near cave openings. It has been recorded from sea level to 800 m, and exceptionally to altitudes of 1500 m.[3][4]

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References

This article incorporates public domain text from the reference [4]

  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. Med), Benjamín Gómez Moliner (Europe & (2010-08-23). "IUCN Red List of Threatened Species: Trissexodon constrictus". IUCN Red List of Threatened Species. Retrieved 2020-03-20.
  4. "Species summary for Trissexodon constrictus". AnimalBase, last modified 26 September 2008, accessed 12 January 2011.
  • Tryon G. W. (1895). Manual of Conchology (2)3: page 121. plate 24, figure 38-40.
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