Rapid invasion of the slug Krynickillus melanocephalus Kaleniczenko, 1851 in Sweden and some notes on the biology and anthropochorous spread of the species in Europe (Gastropoda: Eupulmonata: Agriolimacidae)

Ted von Proschwitz, e-mail: ted.v.proschwitz@vgregion.se

Gothenburg Natural History Museum, Box 7283, 40235 Gothenburg, Sweden
Gothenburg Global Biodiversity Centre, University of Gothenburg, Box 461, 40530 Gothenburg, Sweden

The terrestrial slug Krynickillus melanocephalus, native to the Caucasus and adjacent areas, has in the latter decades, by means of man-mediated (anthropochorous) dispersal, spread westwards over areas of the former USSR, central, and northern Europe. The first record in Sweden could be traced back to 2015, and during the autumn 2019 30 further occurrences, mainly in the eastern parts of the country, were confirmed. The habitats are in most cases gardens, but it has also spread into adjacent waste land and man-influenced woodlands. The species is highly invasive and colonises disturbed habitats where it forms large populations. Its feeding habits and possible pest status need to be studied. Further rapid spread, both west- and southwards in Europe, is to be expected. The external appearance and genital morphology of K. melanocephalus in Swedish populations are briefly described.

Key words
Man-mediated spread; invasive species; pest-slug; Eupulmonata; Agriolimacide; limes norrlandicus

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Folia Malacologica (2020) 28: 227-234
First published on-line: 2020-08-11 00:00:00
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