Based on existing literature, data from citizen science portals and new findings in the field, the genus Phylloecus Newman, 1838 (= Hartigia Schiødte, 1839) is reviewed. Apart from details of the local distribution in Belgium, other aspects are investigated more extensively. The reproduction mechanisms of P. faunus are discussed: it seems to be parthenogenetic in the northern parts of Europe (1). We confirm the morphological diversification of the P. niger species complex living on Rosa spp. (2). Having found and reared Phylloecus linearis and P. xanthostoma, new illustrative material is provided of both larvae and their ecology (3). A morphological table compares the similarities and differences between the four species currently known in Western Europe (4).
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