Allognathus hispanicus

Allognathus hispanicus (now known as Allognathus balearicus) is a species of land snail in the family Helicidae, the true snails. This species is endemic to Mallorca, one of Spain's Balearic Islands.[1] The common name is "caragol de Serp" (snake snail), due to the pattern of it shell.

Allognathus hispanicus
Aperture view of the shell of Allognathus hispanicus
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. hispanicus
Binomial name
Allognathus hispanicus
(Rossmässler, 1838)
Synonyms
  • Helix hispanica Rossmässler, 1838
  • Helix balearica Rossmässler, 1838 (in syn.)
  • Iberellus balearicus Rossmässler, 1838

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

Description

Globose-flatenned shell with 4 ½ whorls with a clear suture and thin and irregular striation. Last whorl 3 times larger than the penultimate, growing progressively to the aperture. The aperture is oblique-oval descending from the third to the fourth whorl. Soft peristome with a brownish inner lip slightly reflected. Umbilicus completely closed.[2]

Allognathus hispanicus Puíg de la Verge, Pollença (Mallorca). Scale bar 1 cm.

Distribution

The species is distributed along the northern Tramuntana Mountains in western Mallorca, cohabiting in many localities with A. graellsianus.[2][3]

References
  1. Gómez Moliner, B.J. 2011. Allognathus hispanicus. The IUCN Red List of Threatened Species 2011: e.T156607A4971951. https://doi.org/10.2305/IUCN.UK.2011-1.RLTS.T156607A4971951.en. Downloaded on 9 April 2019.
  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.
  3. Chueca, Luis J.; Madeira, María José; Gómez‐Moliner, Benjamín J. (2015). "Biogeography of the land snail genus Allognathus (Helicidae): middle Miocene colonization of the Balearic Islands". Journal of Biogeography. 42 (10): 1845–1857. doi:10.1111/jbi.12549. ISSN 1365-2699.
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