Slug

slugsland slugkeelterrestrial slugsAmbush SlugKeel (slug)Thudslugs
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.wikipedia
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Gastropoda

gastropodgastropodsgastropod molluscs
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.
This class comprises snails and slugs from saltwater, from freshwater, and from the land.

Pulmonata

pulmonatepulmonatesair-breathing
Of the six orders of Pulmonata, two – the Onchidiacea and Soleolifera – solely comprise slugs.
Pulmonata, or "pulmonates", is an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills.

Sigmurethra

Helicina (suborder)sigm''urethrasigmurethrous
A third family, the Sigmurethra, contains various clades of snails, semi-slugs (i.e. snails whose shells are too small for them to retract fully into) and slugs.
Sigmurethra is a taxonomic category of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs.

Mollusca

molluskmolluscmolluscs
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.
The gastropods (snails and slugs) are by far the most numerous molluscs and account for 80% of the total classified species.

Veronicelloidea

RathouisioideaSoleolifera
Of the six orders of Pulmonata, two – the Onchidiacea and Soleolifera – solely comprise slugs.
Veronicelloidea is a superfamily of air-breathing land slugs.

Terrestrial mollusc

terrestrialTerrestrial molluscsterrestrial mollusks
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.
This group includes land snails and land slugs.

Athoracophoridae

Athoracophoroidea
Athoracophoridae, common name the leaf-veined slugs, are a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the infraorder Stylommatophora, the stalk-eyed snails and slugs.

Achatinoidea

The Achatinoidea are a superfamily of air-breathing land snails and slugs, terrestrial gastropod mollusks in the informal group Sigmurethra.

Arionoidea

Arionoidea is a taxonomic group, superfamily of air-breathing land slugs, shell-less terrestrial pulmonate gastropod mollusks.

Acavoidea

The Acavoidea are a taxonomic superfamily of air-breathing land snails and slugs, terrestrial pulmonate gastropod mollusks in the informal group Sigmurethra.

Semi-slug

semislugsemislugs
The word slug is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semislugs (this is in contrast to the common name snail, which applies to gastropods that have a coiled shell large enough that the animal can fully retract its soft parts into the shell).
This is a type of gastropod that is intermediate between a slug (without an external shell) and a land snail (with a large enough shell to retract completely into).

Clausilioidea

The Clausilioidea are a superfamily of air-breathing land snails and slugs, terrestrial gastropod mollusks in the informal group Sigmurethra.

Limacoidea

Limacoidea is a taxonomic superfamily of medium-sized to large, air-breathing land slugs and snails.

Punctoidea

Punctoidea is a superfamily of air-breathing land snails and slugs, terrestrial pulmonate gastropod mollusks in the informal group Sigmurethra.

Rhytidoidea

The Rhytidoidea are a superfamily of air-breathing land snails and slugs, terrestrial gastropod mollusks in the informal group Sigmurethra.

Parmacelloidea

Parmacelloidea is a superfamily of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the clade Stylommatophora and the informal group Pulmonata.

Tandonia budapestensis

Some species of slugs, for example Tandonia budapestensis, have a prominent ridge running over their back along the middle of the tail (sometimes along the whole tail, sometimes only the final part).
Tandonia budapestensis is a species of air-breathing, keeled, land slug, a shell-less terrestrial gastropod mollusks in the family Milacidae.

Philomycidae

Adult Philomycidae, Onchidiidae and Veronicellidae lack shells.
Philomycidae are a family of air-breathing land slugs (snails without shells or with only shell remnants).

Onchidiidae

Onchidioidea
Adult Philomycidae, Onchidiidae and Veronicellidae lack shells.
Onchidiidae are a family of small, air-breathing sea (and land) slugs.

Limax maximus

Great grey sluggrey sluggreat gray slug
Some species of slug, such as Limax maximus, secrete slime cords to suspend a pair during copulation.
Limax maximus (literally, "biggest slug"), known by the common names great grey slug and leopard slug, is a species of slug in the family Limacidae, the keeled slugs.

Limacidae

An internal shell is present in the Limacidae and Parmacellidae.
Limacidae, also known by their common name the keelback slugs, are a taxonomic family of medium-sized to very large, air-breathing land slugs, terrestrial pulmonate gastropod molluscs in the superfamily Limacoidea.

Veronicellidae

Vaginulidae
Adult Philomycidae, Onchidiidae and Veronicellidae lack shells.
The Veronicellidae, also known by their common name the leatherleaf slugs, are a family of pulmonate terrestrial slugs.

Pneumostome

pulmonary aperture
This opening is known as the pneumostome.
The pneumostome or breathing pore is a respiratory opening of the external body anatomy of an air-breathing land slug or land snail.

Deroceras

Apophallation has been reported only in some species of banana slug (Ariolimax) and one species of Deroceras.
Deroceras is a taxonomic genus of small to medium sized air-breathing land slugs in the family Agriolimacidae.

Hermaphrodite

hermaphroditichermaphroditismhermaphrodites
Slugs are hermaphrodites, having both female and male reproductive organs.
For example, the great majority of tunicates, pulmonate snails, opisthobranch snails, earthworms, and slugs are hermaphrodites.