E. Dreijers, H. Reise & J.M.C. Hutchinson 2013. Mating of the slugs Arion lusitanicus auct. non Mabille and A. rufus (L.): different genitalia and mating behaviours are incomplete barriers to interspecific sperm exchange. Journal of Molluscan Studies 79:5163.
https://doi.org/10.1093/mollus/eys033 (now open accesss).
The quality of the figures is slightly higher in this preprint.
A video of the interspecific spermatophore exchange (Fig. 1) is available here.
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