Figs 25–32. Genital anatomy of two individuals of A. ater s.l., morphotype FR: 25–29 – SMNG p20100, Pisarzowice, near Lubań, PL (leg. 2014); 30–32 – SMNG p17128T1, Zgorzelec, PL (leg. 2010). 25, 30 – genitalia oriented as when the slug is first opened (although in 30 the atrium had already been opened but then folded back); 26 – the back side of the same genitalia as in 25; 27, 31 – the folded-up ligula on first opening the atrium; 28, 32 – the atrium pinned out; 29 – tubercles inside distal part of epiphallus. Ligulas are shaded olive, and the funnel turquoise. Abbreviations: bd – bursa-duct, ep – epiphallus, la – lower atrium, ua – upper atrium, flf – flap of left flank, frf – flap of right flank, ov – oviduct

Published as part of Reise, Heike, Schwarzer, Anne-Katrin, Hutchinson, John M. C. & Schlitt, Bettina, 2020, Genital morphology differentiates three subspecies of the terrestrial slug Arion ater (Linnæus, 1758) s.l. and reveals a continuum of intermediates with the invasive A. vulgaris Moquin-Tandon, 1855, pp. 1-34 in Folia Malacologica 28 (1) on page 14, DOI: 10.12657/folmal.028.001, http://zenodo.org/record/4615365