Allognathus graellsianus

Allognathus graellsianus is a species of land snail in the family Helicidae, the true snails. It is endemic to Mallorca, one of Spain's Balearic Islands.[1] This taxa is the type species of the genus Allognathus.

Allognathus graellsianus
Apertural view of the shell of Allognathus graellsianus
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:
Helicidae
Genus:
Allognathus
Species:
A. graellsianus
Binomial name
Allognathus graellsianus
(Pfeiffer, 1853)
Synonyms
  • Helix grateloupi Graells, 1846
  • Helix graellsiana Pfeiffer, 1848

The snail lives in cracks in rocks and walls and is only active when it rains.[1]

Description

A. graellsianus presents a thin globose shell. It has from 4 to 4 ½ whorls of fast growth, showing 5 bands well separated and usually discontinued. The aperture is oval-rounded with a reddish brown reflected peristome. The umbilicus is completely closed.[2]

Allognathus graellsianus Escorca (Mallorca). Scale bar 1 cm.

Distribution

The species is distributed along northwestern Tramuntana Mountains (western Mallorca), cohabiting in many localities with A. hispanicus.

References
  1. Gomez, B. 2013. Allognathus graellsianus. The IUCN Red List of Threatened Species. Version 2014.3. Downloaded on 17 April 2015.
  2. Chueca, Luis J.; Forés, Maximino; Gómez-Moliner, Benjamín J. (2013). "Consideraciones nomenclaturales sobre las especies del género Allognathus (Gastropoda: Pulmonata: Helicidae) y estudio anatómico de Allognathus hispanicus tanitianus". Iberus. 31: 63–74.


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