[Allantini from Belgium and neighbouring regions (Hymenoptera Tenthredinidae Allantinae)] | Les Allantini de la Belgique et des regions limitrophes (Hymenoptera Tenthredinidae Allantinae)
1999
Magis, N. (Faculte universitaire des sciences agronomiques de Gembloux (Belgium). Unite de zoologie generale et appliquee)
Faunistical knowledge about the 15 species belonging to the tribe Allantini from Belgium and neighbouring regions are summarized. Keys for the identification of genera and species are given. Emphytus cingillum (Klug) and E. laticinctus (Servile) (= balteatus (Klug)) are recognized and cited for the first time from the country. The flight period of the adults extends from early April to the end of October, during about 210 days. This long period results from the coexistence of early spring species with particularly late ones, flying from the middle of August until the end of October. Most species of Emphytus Klug are regularly bivoltin. Precisions about the phenology of each species are given. The faunistic drift of Allantini is analyzed and discussed. Since 1950, the 3 species Apethymus serotinus (Muller), Allantus togatus (Panzer) and Emphytus didymus (Klug) are in regression, but the responsible factor(s) could not be identified. On the contrary, 2 taxa exhibit a relative progression: Emphytus cinctus (Linne), which is always the most frequent and the most numerous species, and E. truncatus (Klug). The comparison of distribution maps indicates a general regression in the natural regions on the south of the "Sambre-et-Meuse" groove.
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