Koponen, M.; Askew, R.R. 2002, Chalcids from Madeira, Canary Islands and Azores (Hymenoptera, Chalcidoidea). Vieraea (Folia Scientarum Biologicarum Canariensum)
30:138
[ Three species of Pnigalio Schrank recorded from Madeira, one cited as near soemius (Walker), the other as near longulus| (Zetterstedt). ]
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