Letourneuxia nyctelia is a species of terrestrial slug, a gastropod mollusc, belonging to the family Arionidae.

[3] These included Letourneuxia moreleti, which Castillejo [4] considered instead to be a species of Geomalacus (criticised by [5]).

In 2022 it was proposed that Bourguignat's 1861 description of Limax nyctelius[1] referred to a juvenile of the same species that he described five years later as Letourneuxia numidica.

[5] The forward position of the pneumostome is not known in any other North African species, and the stripes match.

[6] The lectotype has been designated as the specimen in the illustration referred to in the original species description.