What is the world's largest type of terrestrial slug?

The world's largest terrestrial slug is Limax cinereoniger, also known as the ash-black slug. This species is native to Europe and can reach a length of up to 30 centimeters (almost one foot) when fully extended. The ash-black slug is a member of the Arionidae family, which includes a number of other large slug species.

Like other slugs, the ash-black slug has a soft, moist body and feeds primarily on plant material. It is active at night and is often found in damp environments such as forests, gardens, and fields. The ash-black slug is known for its distinctive coloration, which includes a black body with white spots.

While the ash-black slug is the largest known terrestrial slug, there are larger species of sea slugs, which are found in marine environments. These include the sea hare, which can grow up to 75 centimeters (2.5 feet) in length, and the Spanish dancer, which can reach a length of up to 60 centimeters (2 feet).

The world's largest type of terrestrial slug is the ash-black slug (Limax cinereoniger). It is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Limacidae, the keelback slugs. It is the largest land slug species in the world.

The ash-black slug is native to Europe, where it is found in ancient woodlands throughout all but the most northerly regions. It is a large slug, reaching a length of up to 30 cm (12 in). The body is black or dark gray, with a paler underside. The foot is broad and flattened, with a keel running down the center. The head is small and pointed, with two pairs of tentacles.

The ash-black slug is a herbivore, and feeds on a variety of plants, including fungi, leaves, and fruits. It is nocturnal, and spends the day hiding under rocks or in leaf litter. It is a hermaphrodite, and can reproduce by self-fertilization.

The ash-black slug is not considered to be a pest, and is generally harmless to humans. However, it can be a nuisance in gardens, where it can damage plants.