Yellow Slug - Limacus flavus

Alternative names
Limax flavus

Length extended: 8 or 9 cm. The body is usually a lemon yellow colour with darker markings. The tentacles are often blue. It has a central yellow line along the keel which extends from the tail to around half the body length, though may be broken into dashes.

Similar Species

Limacus maculatus, the Irish Yellow Slug, is very similar and may be replacing L. flavus in some areas. Its yellow background colour is often a duller shade and is overlaid with larger spots and blotches – making it appear darker and greener overall. Its tentacles are more blue-grey. It may have a short keel stripe at the tail end but this stops well before the halfway point of the body.

Identification difficulty

Often associated with man, it can be found in gardens and even cellars.

When to see it

All year round.

Life History

Feeds mostly on fungi, decaying matter and vegetables.

UK Status

Occasional in England and Wales.

VC55 Status

Rare/uncommon in Leicestershire and Rutland and declining as it is replaced by Limacus maculatus. It is believed that L. flavus and L. maculatus hybridise which is contributing to the loss of the former species.

be our species champion

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map