Palaearctic-origin
Guides
Margarinotus merdarius
clown beetle
Margarinotus merdarius is a species of clown beetle (family Histeridae) originally described from Europe. It has been introduced to North America, where it is now established in Canada and the United States. The species belongs to a genus known for association with dung and decaying organic matter.
Stenarella domator
Stenarella domator is a western Palaearctic ichneumonid wasp recently introduced to the Nearctic region. It belongs to the subtribe Osprynchotina within the subfamily Cryptinae. The species is an ectoparasitoid that targets aculeate Hymenoptera nesting in mud or earth substrates. Its establishment in North America represents a notable range expansion for this parasitoid lineage.
Stevenia deceptoria
Grizzled Woodlouse-fly
Stevenia deceptoria is a parasitoid fly in the family Rhinophoridae, originally described from the Palaearctic region and recently recorded in North America for the first time. Like other rhinophorids, it parasitizes terrestrial woodlice (Isopoda: Oniscoidea). The species is known as the Grizzled Woodlouse-fly in vernacular usage.
Uroleucon sonchi
Sow-thistle Aphid, Large Sow-thistle Aphid, Brown Lettuce Aphid
Uroleucon sonchi is a large aphid species in the family Aphididae, commonly known as the sow-thistle aphid or brown lettuce aphid. Native to the Palaearctic region, it has been introduced to multiple continents and is now cosmopolitan in distribution. The species is economically significant as a pest of cultivated lettuce and related crops, while also occurring on wild Asteraceae hosts. It reproduces parthenogenetically during spring and summer, typical of many aphids.