Research Article ISSN 2336-9744 The journal is available on line at www.ecol-mne.com http://zoobank.org/urn:lsid:zoobank.org:pub:A6EF195D-2F65-49F8-B5C6-CCFF9ED23E3E Tandonia bolensis n. sp., a new slug (Gastropoda: Pulmonata: Milacidae) from the island of Bra č (Dalmatia, Croatia) WILLY DE MATTIA 1* & GIANBATTISTA NARDI 2 1 International Centre for Genetic Engineering and Biotechnology (ICGEB) Padriciano, 99. 34149 Trieste, Italy, E- mail:
[email protected].* Corresponding author. 2 Via Boschette 8/A, I-25064 Gussago (BS), Italy, E-mail:
[email protected] Received 11 September 2014 │ Accepted 24 September 2014 │ Published online 25 September 2014. Abstract The genus Tandonia Lessona & Pollonera, 1882 is represented along the Western Balkans by about 13 taxa, most of which are regional endemics. Recent collecting on the island of Bra č (Croatia) has provided a single, fully grown specimen of a totally black slug. A careful investigation of the genital anatomy and body traits, reveal characteristic and unique morphological features which until now have never been observed in other representatives of the genus. Such results have led to the description of new species. Tandonia bolensis n. sp. is easily distinguishable by virtue of its genital features, the dummy-like penial-atrial papilla, and the long and partially spiral-convoluted, thorny spermatophore. Key words : Tandonia bolensis n. sp., Milacidae, Bra č island, Dalmatia, taxonomy, systematics, biogeography, Western Balkans, Mollusca. Introduction The slug family Milacidae Ellis, 1926 is represented by two genera: Milax Gray, 1855, with about 12 known species and Tandonia Lessona & Pollonera, 1882, with more than 30 species currently considered valid.