Fig. 3

Neighbour-Joining tree based on K2P genetic distances displaying 138 individual samples. Already published DNA sequences are indicated by their GenBank accession numbers. Our samples are simply numbered (e.g. Arion_001). Abbreviated with “r” and in red are the two reference COI barcodes for A. rufus [53], abbreviated with “l” and in orange are all barcodes of A. vulgaris (reference barcodes still named A. lusitanicus; 53), abbreviated with “d” and in dark yellow A. distinctus [43], abbreviated with “u” and in light yellow A. fuscus [44], abbreviated with “f” and in violet A. fasciatus [42], and abbreviated with “D” and in blue is D. reticulatum [45]