The distribution of the species of the genus Deroceras Rafinesque, 1820 in Belgium (Gastropoda, Pulmonata, Agriolimacidae)

De Wilde, J.J. and Van Goethem, J. L. and Marquet, R. (1985) The distribution of the species of the genus Deroceras Rafinesque, 1820 in Belgium (Gastropoda, Pulmonata, Agriolimacidae). Folia historico-naturalia Musei Matraensis, 10. pp. 103-114. ISSN 0134-1243

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Abstract

Four species belonging to the genus Deroceras are known from Belgium: D. reticulatum /MÜLLER, 1774/, D. laeve /MÜLLER, 1774/, D. caruanae /POLLONERA, 1891/ and D. agreste /LINNAEUS, 1758/. The distribution of D. reticulatum, P. laeve and D. caruanae as known at the end of 1971 is compared with a map showing all records of landsnail species in Belgium till then. A similar comparison is given for the year 1982. From the period 1972-1982 year to year maps- showing all records of each of these three Deroceras species are compared with a corresponding map compiling all landsnail records of the same year. At present P.reticulatum,D.laeve and D. caruanae are very widespread and common. D. caruanae was found for the first time in Belgium in 1968. As shown by means of a series of cumulative maps, D. caruanae became very rapidly widespread /1973 onwards/ presenting an explosive dispersal. Undoubtedly,man assisted in its introduction and dispersal. P. agreste seems to be very rare in Belgium with a limited number of local populations in the four southern provinces.

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