Arion timidus - Wikiwand

Species of gastropod

Arion timidus

Arion timidus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Arionidae
Genus:	Arion
Species:	A. timidus
Binomial name
*Arion timidus* Morelet, 1845

Arion timidus, is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs.^[1]

(Original description in Latin) The animal is dusky-blackish; the margin is yellowish and radiated (streaked with lines), and it is divided into two parts by a chestnut line.

The mantle (clypeus) is small and worm-like (vermiculate); the body is cylindrical, is obtusely conoidal posteriorly, and is roughly sulcate (grooved).

The head and the tentacles are short and are often semi-retracted; the branchial cavity is anterior.

The [animal] is greenish from dusky, the margin is iron-colored (or steely), and the head and the tentacles are black.^[2]

The holotype is characterized by having a very short epiphallus and vas deferens alongside a long and slender bursal duct.^[3]

Distribution

This species occurs in central Portugal.

References

↑ Arion timidusMorelet, 1845. 3 November 2025. Retrieved through: World Register of Marine Species.
↑ Morelet, A. (1845). Description des mollusques terrestres et fluviatiles du Portugal. Baillière, Paris. i-vii + 1-115 [+ 1., 14 pls. , available online at https://www.biodiversitylibrary.org/page/12988736 page(s): 31, pl. 2, fig] This article incorporates text from this source, which is in the public domain.
↑ Winter, A.J. de (1986). "Little known and new south-west European slugs (Pulmonata: Agriolimacidae, Arionidae)". Zoologische Mededelingen. 60 (10): 157. Retrieved 3 November 2025. This article incorporates text from this source, which is under a CC BY 4.0 license.

Simroth, H . , 1891. Die Nacktschnecken der portugiesisch-azorischen Fauna in ihren Verhàltnis zu denen der paláarktischen Region überhaupt. — Nova Acta Leop.-Carol. Dtsch. Akad. Naturforsch. 56: 201–424, T. IX-XVIII.
Breure, A.S.H., Audibert, C. & Ablett, J.D. (2018). Pierre Marie Arthur Morelet (1809–1892) and his contributions to malacology. Leiden: Nederlandse Malacologische Vereniging. 544 pp.

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