Invasive
Guides
Nanophyes marmoratus
Flower Bud Weevil
Nanophyes marmoratus is a small weevil in the family Brentidae, commonly known as the Flower Bud Weevil. It is native to Europe and has been introduced to North America. The species is associated with flower buds of its host plants, though specific host relationships require further documentation. It is one of approximately 180 species in the genus Nanophyes, a group of minute weevils typically under 5 mm in length.
Naupactus
White-fringed Weevils
Naupactus is a large genus of weevils in the family Curculionidae, commonly known as white-fringed weevils. The genus comprises exclusively Neotropical species, several of which have been introduced to other regions and become significant agricultural pests. Members of this genus are characterized by reduced humeri and lack of metathoracic wings, traits formerly used to separate them into the genus Graphognathus before taxonomic revision. Some species exhibit parthenogenetic reproduction, and flightless adults are common.
Nemastoma bimaculatum
Gold-spotted Harvestman
Nemastoma bimaculatum is a small harvestman species native to western Europe, recognized by its distinctive coloration. It has been introduced to North America, where established populations occur in Ontario, Canada. The species was first documented in North America by LeSage (1977).
Neophyllaphis podocarpi
Podocarpus Aphid
Neophyllaphis podocarpi is an aphid species in the subfamily Neophyllaphidinae, known as the podocarpus aphid. It is specialized on Podocarpus species (Podocarpaceae), a genus of coniferous trees. The species was first described from Japan in 1920 and has since been recorded in multiple regions including Hawaii, Italy, the Azores, and the Iberian Peninsula. Its spread appears linked to horticultural trade of host plants.
Neoscapteriscus vicinus
tawny mole cricket
Neoscapteriscus vicinus, the tawny mole cricket, is a burrowing orthopteran native to South America that has become established in the southeastern United States since its introduction around 1900. The species was reclassified from Scapteriscus to the new genus Neoscapteriscus in 2015 based on morphological differences. It is a significant agricultural and turf pest that damages plants through root feeding and tunneling activities.
Obolodiplosis
locust gall midge
Obolodiplosis is a monotypic genus of gall midges in the family Cecidomyiidae, containing the single species Obolodiplosis robiniae. The genus was established by Felt in 1908. All biological information known for this genus derives from studies of its sole representative species.
Ochetellus glaber
black household ant, black house ant, tramp ant, Copper-bellied Ant
Ochetellus glaber is a small ant species native to Australia, widely introduced globally through human commerce. Workers measure 2–3 mm, with queens reaching 5.2–5.5 mm. The species is recognized as a species complex with cryptic diversity, complicating identification and management decisions. It nests arboreally and in structures, forming conspicuous trails to exploit honeydew and food resources. Considered a household pest, it has established populations in Hawaii, Florida, New Zealand, and multiple Asian and Pacific regions.
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.
Odontomachus
trap-jaw ants
Odontomachus is a genus of ants commonly known as trap-jaw ants, characterized by their extraordinary spring-loaded mandibles that can snap shut at speeds among the fastest recorded for animal movements. The genus contains approximately 84 valid species distributed throughout tropical and subtropical regions worldwide. These ants are active predators that use their powerful jaws for hunting, defense, and in some species, locomotion via jumping. Several species have been introduced to new regions, including the southeastern United States, where they are expanding their ranges.
Oecobius amboseli
Oecobius amboseli is a species of wall spider in the family Oecobiidae, first described in 1974. Native to East Africa and Egypt, it has established introduced populations in northwestern Europe including Denmark, the Netherlands, and Belgium. As a member of the Oecobiidae, it belongs to a family known for constructing flat, circular webs on vertical surfaces.
Onychopoda
Onychopoda is a specialized order of predatory branchiopod crustaceans within the superorder Cladocera, distinguished by having only four pairs of legs (compared to five or six in related orders) and segmented raptorial appendages used for grasping prey. The order comprises three families (Cercopagididae, Podonidae, Polyphemidae), ten genera, and approximately 33 described species. Most species are endemic to the Ponto-Caspian basin, though some occur in freshwater and marine habitats worldwide. Onychopoda exhibits one of the most distinctive morphological and ecological radiations among cladocerans, having evolved predation as a novel feeding strategy and colonized habitats across a broad salinity range.
Operophtera brumata
Winter Moth
Operophtera brumata, the winter moth, is a geometrid moth native to Europe and the Near East that has been introduced to North America. It is notable among temperate Lepidoptera for adult activity during late fall and early winter. Females are flightless, while males are fully winged. The species is a significant pest of deciduous trees and an important food source for birds such as Blue Tits, which feed their young almost exclusively on winter moth caterpillars. The USA National Phenology Network includes this species in its Pheno Forecast program to aid pest management.
Opogona
fungus moths
Opogona is a genus of fungus moths in the family Tineidae, representing the type genus of subfamily Hieroxestinae. The genus is most diverse in tropical regions, with approximately 30 species known from Australia alone. Some species have been introduced outside their native ranges, including the banana moth (O. sacchari) and O. omoscopa in Europe. The genus exhibits exceptional radiation on St Helena Island in the South Atlantic, where 41 species occur, 31 of them endemic.
Opogona sacchari
banana moth, sugar-cane moth
Opogona sacchari is a tineid moth native to humid tropical and subtropical regions of sub-Saharan Africa, including Madagascar and Indian Ocean islands. It has become established in glasshouses and tropical agriculture worldwide, causing damage to bananas, pineapples, sugarcane, and numerous ornamental plants. The species exhibits thermal sensitivity, with development optimal at 25°C and complete mortality above 30°C.
Opopaea deserticola
Goblin spider
Opopaea deserticola is a species of goblin spider in the family Oonopidae, first described by Eugène Simon in 1892. Originally described from Southeast Asia, this species has demonstrated remarkable dispersal capabilities and is now recognized as having one of the widest distributions among oonopid spiders. It has been introduced to numerous regions worldwide including the Americas, Pacific islands, Atlantic islands, and Japan. The species is part of a diverse radiation of minute spiders that inhabit leaf litter and soil microhabitats, where their small size and cryptic coloration make them exceptionally difficult to detect.
Ostrinia nubilalis
European corn borer, European corn worm, European high-flyer
The European corn borer is a non-native moth pest of corn and other crops in North America, Europe, and North Africa. Larvae bore into corn plants, causing damage to stems, ears, and leaves. Two pheromone strains exist: the Z strain (prevalent in the midwestern U.S.) and the E strain (more abundant in the eastern U.S. and Europe). Widespread adoption of Bt corn since 1996 has dramatically reduced populations in North America, with over 90% suppression reported in some regions.
Oxycarenus hyalinipennis
cotton seed bug
Oxycarenus hyalinipennis, commonly known as the cotton seed bug, is a small seed-feeding true bug in the family Oxycarenidae. It is a polyphagous pest of Malvaceae, with Gossypium (cotton) as its preferred host. The species is native to the Mediterranean region and Africa but has expanded its range to the Caribbean in recent decades. It completes three to four generations per year under favorable conditions.
Ozognathus
death-watch beetles, spider beetles
Ozognathus is a genus of beetles in the family Ptinidae, commonly referred to as death-watch and spider beetles. The genus contains at least 11 recognized species native to the Americas. One species, Ozognathus cornutus, has become established as an alien species in Europe and the Mediterranean region, where it colonizes woody galls and decaying organic matter. The genus is taxonomically placed in the subfamily Ernobiinae (or historically Anobiinae), reflecting its close relationship to other wood-associated beetles.
Ozognathus cornutus
Acorn Anobiid
Ozognathus cornutus is a small spider beetle native to North America that has established populations across Europe, the Mediterranean, North Africa, New Zealand, and South America. Adults are dark brown to black, measuring 1.5–2.8 mm. The species is saproxylophagous, feeding primarily on decaying wood tissues within galls formed by other insects, as well as dried fruits, vegetables, wood shavings, and insect excrements. It acts as a secondary occupant (successor) in galls of various gall-forming insects, with documented associations on at least 41 host-plant species. Despite potential to damage stored food products, the species shows strong preference for woody galls, which may limit economic impact.
Palaemon elegans
rockpool shrimp, rockpool prawn
Palaemon elegans is a small caridean shrimp native to northeastern Atlantic and Mediterranean coastal waters. It has expanded its range through human-mediated transport and changing environmental conditions, becoming established in the Baltic Sea, Caspian Sea, and Aral Sea. The species is ecologically similar to several congeners, particularly Palaemon adspersus, with which it competes and has displaced in some regions. Its tolerance of variable salinity has facilitated colonization of brackish environments.
Pediopsis tiliae
lime leafhopper
Pediopsis tiliae, commonly known as the lime leafhopper, is a species of leafhopper in the family Cicadellidae. It is associated with lime trees (Tilia species) as its host plant. The species has been recorded across parts of Europe and has been introduced to North America, with observations in the northeastern United States.
Pentodontini
rhinoceros beetles
Pentodontini is the most diverse tribe within the subfamily Dynastinae (rhinoceros beetles), containing over 100 genera distributed across multiple biogeographic regions. Most genera are restricted to a single biogeographic region. The tribe is characterized by substantial morphological diversity, with generic-level identification often relying on mouthpart morphology in females and secondary sexual characters (horns, claw modifications, antennal club length) in males.
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Periphyllus Aphids, maple aphids
Periphyllus is a genus of aphids in the family Aphididae, subfamily Chaitophorinae, containing more than 40 described species. Species in this genus are primarily associated with maple trees (Acer spp.), though some feed on related host plants such as Koelreuteria. Many species exhibit complex life cycles with polymorphic forms including viviparous females, aestivating dimorphs, and sexual morphs. Several species are invasive pests outside their native ranges, spreading with ornamental host plants.
Phalangium opilio
European Harvestman, Common Harvestman, Brown Harvestman, Daddy Longlegs
Phalangium opilio is the most widespread harvestman species globally, native to Europe and much of Asia and introduced to North America, North Africa, and New Zealand. It is a synanthropic species that thrives in human-modified environments including agricultural fields, gardens, and urban green spaces. The species has become a model organism for arachnid developmental biology and comparative genomics due to its ease of laboratory culture and continuous life cycle. Adults are generalist predators and scavengers that contribute to biological pest control in agricultural systems.
Phaneroptera nana
Mediterranean katydid, southern sickle bush-cricket
Phaneroptera nana is a small katydid native to mainland Europe, the Near East, and North Africa. It has established invasive populations in California (first recorded 1952), Oregon (since 2015), and South America, likely spreading via shipping. The species inhabits sunny, dry environments with shrubs and low tree branches. Adults are active primarily in summer and fall.
Philonthus caucasicus
Philonthus caucasicus is a rove beetle in the family Staphylinidae, first described by Nordmann in 1837. The species is native to the Caucasus region and broader Eurasia, with established introduced populations in North America. As a member of the large genus Philonthus, it shares the characteristic shortened elytra and predatory habits typical of staphylinid beetles.
Phorodon cannabis
Cannabis Aphid, Hemp Aphid
Phorodon cannabis is a monophagous aphid pest specialized on hemp (Cannabis sativa), causing significant damage in field and greenhouse cultivations. Native to Eurasia and North Africa, it was first detected in North America in 2016 and has since spread to multiple U.S. states and Canada. The species feeds on phloem sap, causing plant wilting, yellowing, and yield reduction, and transmits Cannabis Streak Virus. Optimal development occurs at 25°C, with mild abiotic stress paradoxically stimulating reproduction via hormesis.
Phyllobius oblongus
Brown Leaf Weevil
Phyllobius oblongus is a European weevil species in the family Curculionidae that has been introduced to North America, with records dating to 1969. It inhabits northern hardwood forests and has been documented in association with sugar maple reproduction in Michigan. The species has a broad native distribution across Europe and western Russia.
Phyllotreta striolata
Striped Flea Beetle, Turnip Flea Beetle
Phyllotreta striolata is a small flea beetle (1.5–2.5 mm) in the family Chrysomelidae, native to Eurasia and now distributed worldwide. It is a major pest of Brassicaceae crops, causing substantial yield losses through adult feeding on aboveground plant parts and larval feeding on roots. The species exhibits strong positive phototaxis with peak sensitivity to blue wavelengths (350–430 nm). It has been recorded from diverse habitats including open prairie, boreal forest, and agricultural systems across North America, Europe, and Asia.
Platycorypha
Platycorypha is a genus of jumping plantlice (psyllids) in the family Psyllidae, established as the type genus of the subfamily Platycoryphinae in 2021. The genus comprises approximately 16 described species, including two extinct species known from fossils. Species occur across the Americas, southern Europe, and Africa. Some species have become invasive pests in urban landscapes, notably Platycorypha nigrivirga on Tipuana tipu in Mediterranean Europe.
Platycorypha nigrivirga
tipu psyllid
Platycorypha nigrivirga, the tipu psyllid, is a Neotropical psyllid species that has become invasive in multiple temperate regions. It exhibits strict host specificity to Tipuana tipu (Fabaceae), feeding on phloem and causing leaf curling and premature defoliation. The species was first documented in Southern California in 2008 and has established populations in Europe and Africa. It is subject to biological control by a complex of generalist arthropod predators.
Pleistodontes froggatti
Moreton Bay fig wasp
Pleistodontes froggatti is a small fig wasp native to Australia with an obligate mutualistic relationship with the Moreton Bay fig (Ficus macrophylla). The species was deliberately introduced to Hawaii in 1921 to support fig cultivation, and established in New Zealand by 1993 through long-distance dispersal or accidental transport. Adult females are approximately 3 mm in length, while males are smaller at 1.5 mm and exhibit distinct coloration. The wasp cannot reproduce outside the syconia of its specific host fig.
Pleistodontes imperialis
Port Jackson Fig Wasp
Pleistodontes imperialis is a fig wasp native to Australia that maintains an obligate mutualism with Ficus rubiginosa (Port Jackson fig), serving as its exclusive pollinator. It is the type species of the genus Pleistodontes. The species has been introduced outside its native range through the ornamental planting of its host figs in Mediterranean urban habitats, with confirmed records from Greece and Cyprus. In its introduced range, it has demonstrated host-switching behavior, also developing in Ficus watkinsiana figs despite this species having a different native pollinator.
Plocamaphis flocculosa
Large Waxy Willow Aphid
Plocamaphis flocculosa is a large aphid species known for its conspicuous waxy covering. It is specialized on willows (Salix species) and produces dense flocculent wax secretions that give it a distinctive woolly appearance. The species is native to North America and has been introduced to parts of Europe, where it has established populations. Its common name directly references the characteristic waxy filaments that coat the body.
Polistes dominula
European Paper Wasp
Polistes dominula is a highly successful invasive social wasp native to Eurasia that has established populations across North America, South America, New Zealand, South Africa, and other regions. First detected in North America near Boston in 1978, it has become one of the most abundant wasps on the continent. The species builds small, exposed paper nests in protected locations and preys primarily on live insects, particularly caterpillars. Unlike yellowjackets, it does not scavenge for meat or sugar. Its rapid spread has been attributed to ecological flexibility, superior competitive ability, and tolerance of human-altered environments.
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Polydrusus is a genus of weevils in the family Curculionidae, subfamily Entiminae, containing dozens of species distributed across Europe, North America, and parts of Asia. Several species have been introduced to North America and have become established in northern hardwood forests, where some function as polyphagous herbivores with documented impacts on tree crops. The genus is taxonomically complex, with multiple subgenera recognized including Conocetus and Orodrusus, and has been subject to recent revisionary work clarifying species boundaries and synonymies. Polydrusus species are frequently confused with the genus Phyllobius due to superficial morphological similarities, though they are not closely related.
Porcellio scaber
Common Rough Woodlouse, Rough Woodlouse
Porcellio scaber is a European woodlouse species with a cosmopolitan distribution, now found across North America, South Africa, Australia, and sub-Antarctic islands through human-mediated dispersal. It is one of the most abundant and widespread terrestrial isopods in many regions, including the United Kingdom where it is considered one of the 'big five' woodlouse species. The species is notable for its rough, tuberculate exoskeleton and inability to conglobate (roll into a ball), instead relying on tonic immobility and chemical defenses when threatened. Research has documented individual personality traits in this species, expressed through consistent differences in defensive behavior duration.
Procambarus
crayfish, crawfish, crawdad
Procambarus is a genus of freshwater crayfish in the family Cambaridae, native to North and Central America. The genus contains approximately 160 species in 16 subgenera, making it one of the most species-rich crayfish genera. It includes both widespread surface-dwelling species and numerous troglobitic (cave-dwelling) species. The marbled crayfish (marmorkrebs), a parthenogenetic form, is also classified within this genus. Several species, particularly P. clarkii (red swamp crayfish), have been introduced globally and are recognized as invasive species with significant ecological and economic impacts.
Procambarus acutus acutus
White River crayfish, eastern white river crayfish
Procambarus acutus acutus is a subspecies of freshwater crayfish native to the southeastern United States. It has been introduced to Ontario, Canada, where established populations now exist in the Severn Sound region and Oakbank Pond near Toronto. The species forms stable dominance hierarchies and exhibits status recognition between conspecifics. It is capable of causing economic damage to fisheries through scavenging behavior.
Pryeria
Pryeria is a genus of zygaenid moths native to southeastern Asia, with three described species. The genus gained attention when Pryeria sinica was discovered in Virginia and Maryland in 2002, representing a new invasive pest of ornamental Euonymus shrubs in North America. The larvae are gregarious feeders that create distinctive marginal notches on leaves.
Pseudacysta perseae
Avocado Lace Bug
Pseudacysta perseae is a lace bug in the family Tingidae, originally described by Heidemann in 1908. It is a significant foliar pest of avocado (Persea americana), causing characteristic damage to leaves. The species has undergone substantial range expansion from its original Caribbean distribution to include Mexico, the southern United States, and Central America. It has been introduced to California, where population genetic studies indicate at least two separate invasion events. The species passes through four nymphal instars and exhibits sexual dimorphism in antennal coloration, with adult males having a substantially darker fourth antennal segment.
Pseudoedophrys hilleri
Peach Root Weevil
Pseudoedophrys hilleri is a species of broad-nosed weevil in the family Curculionidae. Native to Japan, it has been introduced to eastern North America and is now established in multiple U.S. states and the District of Columbia. It is the sole described species in its genus. The common name "Peach Root Weevil" suggests association with peach cultivation, though specific host relationships require verification.
Pseudoloxops coccineus
Pseudoloxops coccineus is a small plant bug in the family Miridae, originally described from Europe in 1843. The species has been introduced to North America, with established populations documented in Ontario, Canada since approximately 1973. Its introduction is believed to have occurred accidentally via nursery stock importations of European ash (Fraxinus excelsior). The species belongs to a genus that has undergone significant taxonomic revision in recent years, with integrative approaches revealing substantial cryptic diversity in Pacific island populations.
Pterocomma populeum
Poplar Bark Aphid
Pterocomma populeum is an aphid species specialized on poplar trees (Populus spp.). It forms dense colonies on branches and in bark crevices, feeding on phloem sap. The species relies on the obligate endosymbiont Buchnera aphidicola to obtain essential amino acids absent from its carbohydrate-rich diet. Heavy infestations can cause shoot dieback in poplar plantations.
Reticulitermes flavipes
Eastern Subterranean Termite
Reticulitermes flavipes, the eastern subterranean termite, is the most common and economically significant termite species in North America. Colonies are large, ranging from 20,000 to 5 million workers, with a primary queen producing 5,000–10,000 eggs annually. The species exhibits complex caste differentiation including workers, soldiers, and multiple reproductive forms. Native to the southeastern United States, it has become invasive in Europe, South America, and other regions through human transport.
Rhagoletis completa
Walnut Husk Fly
Rhagoletis completa, the walnut husk fly, is a tephritid fruit fly native to central North America and now established in Europe. It is the most economically significant pest of walnut (Juglans regia) production, causing yield losses up to 80% through larval feeding on husk tissue. Adults emerge over a prolonged period from mid-May to October and are distinguished by a dark triangular wing pattern and yellowish-white scutellum. The species has one generation per year, with larvae pupating in soil and a small proportion entering prolonged dormancy.
Rhyacionia buoliana
pine shoot moth, European Pine Shoot Moth
Rhyacionia buoliana is a tortricid moth known as the pine shoot moth. Native to North Africa, North Asia, and Europe, it has become invasive in North and South America. The species is a significant pest of pine trees, with larvae feeding on shoots of Pinus species. Adults are active during summer months in temperate regions.
Salmincola californiensis
gill lice, gill maggot, salmon gill maggot
Salmincola californiensis is a freshwater parasitic copepod in the family Lernaeopodidae that infests the gills and branchial cavities of salmonid fishes, particularly species of Oncorhynchus. Native to the Pacific Rim and now established in introduced ranges including Japan and Colorado, this parasite has become a significant concern for fisheries management and salmonid conservation. Recent research has documented a previously unrecognized naupliar stage and demonstrated strong temperature-dependence in egg development and copepodid survival, with implications for disease management under climate change scenarios.
Sarucallis
crape myrtle aphid
Sarucallis is a monotypic genus of aphids in the family Aphididae. The sole described species, Sarucallis kahawaluokalani, is commonly known as the crape myrtle aphid. Adults measure 1.2 to 1.8 millimeters in body length. The genus is native to Asia and has become widely distributed globally through the ornamental plant trade, tracking the spread of its host plant, crape myrtle (Lagerstroemia spp.).
Sarucallis kahawaluokalani
Crapemyrtle Aphid
Sarucallis kahawaluokalani, the crapemyrtle aphid, is a specialist phloem-feeding pest native to Southeast Asia and first described from Hawaii in 1907. It has spread globally through the ornamental plant trade, closely tracking the distribution of its host plant Lagerstroemia spp. The species exhibits complex life cycle alternation between asexual summer generations and sexual autumn generations producing overwintering eggs. Heavy infestations cause aesthetic and physiological damage through honeydew production and associated sooty mold growth.