Davies, S. M. (1979). Segregates of the Arion hortensis complex (Pulmonata: Arionidae), with the description of a new species, Arion owenii. Journal of Conchology. 30: 123-127. London.
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Davies, S. M.
1979
Segregates of the Arion hortensis complex (Pulmonata: Arionidae), with the description of a new species, Arion owenii