Adventive
Guides
Amblyderus adventive-sp
A small histerid beetle of the genus Amblyderus, recognized as an adventive species in certain regions. Members of this genus are generally associated with decaying organic matter and are often found in dung, carrion, or compost habitats. The specific epithet 'adventive-sp' suggests this represents a non-native or recently introduced population. As with many histerids, it likely serves as a predator or scavenger in decomposing substrates.
Blastobasis maroccanella
Blastobasis maroccanella is a small moth in the family Blastobasidae, first described by Amsel in 1952. It is native to the Macaronesian islands and western Mediterranean region, with a recent introduction to California. The species belongs to a genus of moths whose larvae are predominantly detritivores or feed on plant material.
Cercyon quisquilius
Cercyon quisquilius is a small water scavenger beetle in the family Hydrophilidae. Native to the Palearctic region, it has been introduced to multiple continents and is now cosmopolitan in distribution. The species is one of the most widely distributed members of the genus Cercyon, with established populations in the Americas, Australia, Africa, and various oceanic islands. It is frequently recorded in synanthropic habitats and has been used in phylogenetic studies involving DNA barcoding.
Compsidolon salicellum
Compsidolon salicellum is a plant bug in the family Miridae native to the Palearctic region, with established adventive populations in North America. It inhabits sunny forest edges and isolated bushes, showing a preference for common hazel (Corylus avellana) while occasionally utilizing other deciduous shrubs. The species exhibits zoophytophagous feeding behavior and has a single annual generation with adults active from mid-July through late September.
Ctenocallis
Ctenocallis is a genus of aphids in the family Aphididae, subfamily Calaphidinae. At least one species, C. setosa, has been documented as adventive in Japan, representing the first Asian record for a genus otherwise native to Europe. The genus is characterized by species associated with leguminous host plants.
Demotina modesta
Asian Oak Leaf Beetle
Demotina modesta is a leaf beetle in the family Chrysomelidae, commonly known as the Asian Oak Leaf Beetle. Native to Japan and Korea, it has become established as an adventive species in the southeastern United States. The species is abundant on oaks and is parthenogenetic in at least part of its range, with no males recorded from North America. It is a summer breeder that likely hibernates as larvae or pupae.
Lithurginae
woodborer bees, cactus woodborers
Lithurginae is a subfamily of woodborer bees in the family Megachilidae. Members nest in woody substrates, including dead wood and cactus stems. The subfamily contains five genera: Austrothurgus, Lithurgopsis, Lithurgus, Microthurge, and Trichothurgus. Several species have been introduced outside their native ranges.
Lithurgus chrysurus
Mediterranean wood-boring bee, Golden-tailed Woodborer
Lithurgus chrysurus is a wood-nesting megachilid bee native to the Mediterranean region that has established adventive populations in North America. It is one of the few bees that excavates its own nesting tunnels in wood rather than using pre-existing cavities. The species is univoltine, producing one generation per year, and constructs distinctive silk-lined cocoons for overwintering larvae.
Macrotrachelia nigronitens
minute pirate bug, flower bug
Macrotrachelia nigronitens is a small anthocorid bug, approximately 3 mm in length, native to Central and South America. It has established permanent wild populations in Auckland, New Zealand since at least the 1980s, and is also reported as adventive in North America. The species is a specialised predator of thrips that inhabit leaf-roll galls.
Mycomya
fungus gnats
Mycomya is a large genus of fungus gnats (family Mycetophilidae) containing at least 400 described species. Members are small flies associated with fungal habitats. The genus has a cosmopolitan distribution with records from multiple continents including South America, Australia, New Zealand, and Japan. Some species show cold adaptation and winter activity patterns.
Ocypus nitens
Ocypus nitens is a large, adventive rove beetle in the family Staphylinidae, subfamily Staphylininae, native to Central Europe and now established in eastern North America. First reported from the Americas in 1944, it remained restricted to New England for decades before rapidly expanding its range after 2000. The species was first detected in Canada in 2016 through citizen science contributions to BugGuide, representing the first Canadian record. It is among the largest and most conspicuous rove beetles in its introduced range, making it relatively easy to detect.
Orthochaetes
Orthochaetes is a genus of weevils in the family Curculionidae, tribe Styphlini, established by Germar in 1823. The genus has Palearctic origins, with at least one species, Orthochaetes setiger, documented as an adventive introduction to North America. Records from Canada indicate establishment in Newfoundland and British Columbia. The genus is characterized by morphological features distinguishing it from other Styphlini genera, requiring modified identification keys for North American fauna.
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.
Tautoneura
Tautoneura is a genus of leafhoppers in the family Cicadellidae, subfamily Typhlocybinae, tribe Erythroneurini, established by Anufriev in 1969. The genus is native to the eastern Palearctic and Indo-Malay region, with T. polymitusa being the first species recorded in Europe, where it has established adventive populations. Species in this genus are small, slender insects associated with trees in the family Ulmaceae.
Tautoneura polymitusa
Tautoneura polymitusa is a small leafhopper (2.4–2.7 mm) in the family Cicadellidae, first described from South Korea in 2016. It represents the first European record of both the species and the genus Tautoneura, having been detected in Hungary in 2012 and subsequently found in Italy, Spain, Slovenia, Ukraine, Russia, and Moldova. The species is associated with Ulmaceae (elm family) and has established stable, locally abundant populations in parts of Europe. It hibernates as adults and is attracted to light traps.