
Orange-banded slug - Arion fasciatus
Spotted in a small rain-water stream on Vitosha mountain. Invasive species, first recorded in Bulgaria in 1999. I faced serious problems identifying the mollusks I have photographed, but recently a Bulgarian malacologist I. Dedov joined one of my FB groups and helped to identify them.

''Arion fasciatus'', also known by its common name the Orange-banded Arion, is a species of air-breathing, completely shell-less, land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the round-back slugs, first described by Sven Nilsson in 1823.
Similar species: Land Snails And Slugs
By Jivko Nakev
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Uploaded Sep 9, 2016. Captured Mar 12, 2016 12:09 in ul. "Stefan Stambolov" 192, 1444 Bistritsa, Bulgaria.