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
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
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.