At first glance slugs appear externally symmetrical, but their pneumostome ( breathing hole ) is always on the right side.
12.
The frequency of pneumostome closing and opening is typically less than 0.5 closures per minute in fully hydrated slugs and snails.
13.
On approaching the pneumostome it forms several branches, and the latter, with their accompanying afferent vessels, are fairly well indicated.
14.
In colour it is grey to bluish black, with dark lateral bands ( the right band usually running entirely above pneumostome ).
15.
In a land slug, when the pneumostome is wide open, it is usually very clearly visible on the right side of the animal.
16.
Like other members of the family Arionidae, the black slug has a pneumostome ( breathing hole ) on the right side of its calcareous granules.
17.
The pneumostome is often much easier to see in slugs than in snails, because of the absence of a shell which can often block the view of this area.
18.
Each of the color forms have a red ( possibly orange, magenta, or maroon ) triangle on the mantle surrounding the pneumostome, and a red line at the edge of the foot.
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