Arion occultus

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Arion occultus
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia

clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra

Superfamily: Arionoidea
Family: Arionidae
Genus: Arion
Species: A. occultus
Binomial name
Arion occultus
Anderson, 2004[1]

Arion occultus is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.


This species occurs in:

  • Ireland; appears to be introduced in Ireland, but its country of origin is not known.


This recently recognized species is part of the "Arion hortensis group" of species. It somewhat resembles Arion distinctus in general appearance, and also resembles Arion alpinus, but the internal anatomy of the reproductive system is different.

Reproductive system of Arion occultus is important for species identification.


  1. ^ Anderson R. (2004). "Arion occultus n. sp, a new slug of subgenus Kobeltia Seibert (Pulmonata: Arionidae) from Ireland". Journal of Conchology 38(4): 341-353. abstract.

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