The giant aphid Stomaphis wojciechowskii (Hemiptera: Aphididae: Lachninae) and its parasitoid Protaphidius wissmannii (Hymenoptera: Braconidae) new to Britain
The giant aphid Stomaphis wojciechowskii Depa and its specialist hymenopteran parasitoid Protaphidius wissmannii Ratzeburg are both recorded as new to Britain on the basis of specimens collected during 2018 from multiple sites in northwest Cambridgeshire (United Kingdom). We briefly describe the biology and ecology of the aphid. Molecular analysis suggests that the aphid is a relict population that has remained genetically isolated from populations in continental Europe for up to 30,000 years, rather than a recent colonist. That it has remained undetected until now is probably due largely to its cryptic lifestyle and its predominantly nocturnal habit.