Arion intermedius

Family

Arionidae

Species

Arion intermedius (Normand, 1852)

Common name

Hedgehog Arion, Hedgehog slugSlug:
A snail that either does not possess a shell or has one that is very reduced (no definite coiling) or internal.

Description

Arion intermedius is one of the smaller Arion species. This slugSlug:
A snail that either does not possess a shell or has one that is very reduced (no definite coiling) or internal.
ranges in length from 15-20 mm long with a yellow to grey body and dark grey tentaclesTentacles:
Sensory projections on the head end of a mollusc. There are generally two pairs; upper (posterior) and smaller, lower (anterior). The upper pair bears the eyes. In many snails the eyes are located at the tips of this structure; however, in Basommatophoran snail species, the eyes are located at the base of the tentacles.
and headHead:
The area of a mollusc's body that has the tentacles, eyes and mouth.
. The contracted body of this specimen is not bell-shaped in cross-section. Upon close observation the tuberclesTubercles:
An enlarged or raised region on the body of a slug. The shape of this structure is very variable. (See also tubercle)
are noted to form sharp, transparent points, giving the animal a prickly appearance. The tail of the slugSlug:
A snail that either does not possess a shell or has one that is very reduced (no definite coiling) or internal.
has a pale, narrow footFoot:
The muscular organ on the undersurface of the body of a mollusc upon which the animal rests or uses to crawl.
fringe and also lacks a keelKeel:
Also known as the carina. This is a longitudinal ridge that runs dorsally along the apex of the tail of the animal.
. The sole of the footFoot:
The muscular organ on the undersurface of the body of a mollusc upon which the animal rests or uses to crawl.
is quite distinguishable from other slugSlug:
A snail that either does not possess a shell or has one that is very reduced (no definite coiling) or internal.
species in North America by being yellow-grey to pale orange in color. The mucus produced by this species is pale yellow to bright yellow in color. Though this species is quite distinguishable, it can be mistaken for juveniles of other species (e.g., Arion rufus).

Native range

Western Europe

Distribution

North America:

• U.S.
• Canada

Pacific Islands: Hawaii

Australasia: New Zealand

Asia: Sri Lanka

Europe: Western and Central Europe

Ecology

The diet of Arion intermedius includes living plant tissue and fungi. In areas where it has been introduced, this species can be very destructive. It has been recorded to consume ornamental plants and field crops (e.g. wheat, corn). Self-fertilizationSelf-fertilization:
This is an event where an organism is produced by the fertilization of an egg by sperm from the same organism. (See also hermaphrodite)
is the primary means of reproduction although out-crossing has been noted to occur. Habitats for this species include fields, grassy roadsides, mature gardens and woods. It is capable of living up to a year.

Synonyms

References

Forsyth 2004; Grimm et al. 2009; Kantor et al. 2009; Kerney et al. 1979; Meyer and Cowie 2010; Naggs et al. 2003