Overwintering-aggregation
Guides
Anthribus nebulosus
fungus weevil
Anthribus nebulosus is a small fungus weevil in the family Anthribidae. Native to Europe, the Near East, and Northern Asia (excluding China), it has been introduced to North America. Adults overwinter in bark cracks of coniferous trees, particularly those with thicker bark such as Scots pine and larch. Flight activity occurs primarily from early May to mid-June, peaking in late May and early June, though timing varies with weather conditions and altitude.
Boisea
Boxelder Bugs
Boisea is a small genus of soapberry bugs (family Rhopalidae) with a highly disjunct distribution across North America, India, and Africa. The genus contains at least three recognized species, including the well-known North American boxelder bugs: the eastern Boisea trivittata and western Boisea rubrolineata, plus the African Boisea fulcrata. The patchy, vicariant distribution pattern is considered relictual, suggesting a formerly more extensive continuous range. Members are seed-feeding specialists primarily associated with maple family trees.
Carabus granulatus
Granulated Ground Beetle
Carabus granulatus is a small, winged ground beetle native to the Palearctic, ranging from Ireland to the Russian Far East, with introduced populations in North America. Adults measure 14–20 mm and exhibit metallic greenish-bronze, green, or occasionally black coloration with distinctive granulated elytra. Unlike most Carabus species, it has retained functional flight ability, though it primarily remains ground-dwelling. The species occupies diverse habitats including forests, fields, prairies, taiga, river margins, fens, lakeshores, and upland peat, occasionally occurring in gardens.
Coccinella septempunctata
seven-spot ladybird, seven-spotted ladybug, seven-spotted lady beetle, C-7
Coccinella septempunctata is a predatory lady beetle native to Europe, Asia, and North Africa, now widely established in North America following intentional introduction for biological control. Adults measure 6.5–7.8 mm with distinctive red elytra bearing seven black spots. The species is among the most extensively studied coccinellids due to its importance in aphid biocontrol and its invasive success in new ranges. It completes up to five generations annually with a six-week development cycle from egg to adult.
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Coriarachne is a genus of crab spiders (Thomisidae) described by Thorell in 1870. The genus currently contains four species distributed across boreal and temperate regions of Europe, Asia, and North America. Many previously described species have been synonymized or transferred to related genera including Bassaniana, Bassaniodes, and Pycnaxis.
Harmonia axyridis
harlequin ladybird, multicolored Asian lady beetle, Asian lady beetle, Halloween beetle
Harmonia axyridis is a highly variable coccinellid beetle native to eastern Asia, introduced to North America and Europe beginning in 1916 for biological control of aphids and scale insects. It became established in the wild in North America around 1988 and has since spread across multiple continents, becoming one of the world's most invasive insects. The species exhibits exceptional color polymorphism, with forms ranging from orange-red with black spots to entirely black with red markings. It is now recognized as a significant threat to native ladybird populations through competition and intraguild predation, while also functioning as a household nuisance pest and occasional agricultural contaminant.
Hippodamia
Oblong Lady Beetles, Lady Beetles, Ladybugs
Hippodamia is a genus of lady beetles (Coccinellidae) containing several economically important species. The most common native North American species is H. convergens, which forms overwintering aggregations numbering in the millions and is widely used in biological control. Another notable species, H. variegata, has a cosmopolitan distribution across both hemispheres. Members of this genus are primarily aphidophagous predators valued in agriculture for pest management.
Leptoglossus
leaf-footed bugs
Leptoglossus is a genus of true bugs in the leaf-footed bug family Coreidae, tribe Anisoscelini. Species are characterized by leaflike dilations of the hind tibia, a diagnostic trait of the genus. The genus is distributed throughout the Americas, with some introduced populations in Europe and Asia. Several species are economically significant agricultural pests, notably L. occidentalis, which has become invasive in multiple continents.
Coreidaeleaf-footed-bugagricultural-pestinvasive-speciessymbiosissexual-dimorphismconifer-pestnuisance-pestBurkholderiatachinid-parasitoidpheromone-communicationbuilding-invadermisidentificationTriatoma-look-alikegradual-metamorphosisseed-predatorforest-pestornamental-pestplumbing-damagepublic-health-confusionChileEuropeNorth-AmericaSouth-AmericaAsiaTurkeyalmond-pestcitrus-pesttomato-pestcorn-pestoverwintering-aggregationdefensive-secretionpheromone-mediated-parasitismegg-parasitoidbiological-controlecological-niche-modelingclimate-suitabilityrange-expansionintroductionaccidental-dispersalseed-orchard-pestgermination-reductionempty-seed-formationcone-damagelodgepole-pineDouglas-firwestern-conifer-seed-bugL.-occidentalisL.-zonatusL.-phyllopusL.-clypealisL.-australisL.-chilensisL.-oppositusmale-combatfemoral-weaponabdominal-glandpheromone-glandtibial-dilationleaf-like-hind-legtrue-bugHemipteraHeteropteraPentatomomorphaAnisosceliniphytophagousplant-feedingstylet-feedingsalivary-sheathoverwinteringdiapausebuilding-entrystructural-pestnuisance-odorflight-sounddroning-flightaggregation-behaviormale-pheromonefemale-choiceparasitoid-hostbiological-control-agentintegrated-pest-managementmonitoringearly-detectionpreventioninvasion-biologyalien-speciesnon-native-pestglobal-spreadclimate-changeniche-modelingsuitable-habitatestablishment-riskquarantinephytosanitaryforest-healthseed-productionreforestationafforestationconifer-forestrypine-seedseed-viabilityeconomic-impactcrop-lossyield-reductionkernel-damagefruit-damagenut-damagevector-of-diseaseChagas-diseasekissing-bugpublic-alarmmisinformationeducationidentification-toolshealth-system-burdenpesticide-overuseurban-ecologydomiciliaryperidomiciliaryAndean-regionPatagoniaMediterraneantemperatesubtropicaltropicalagroecosystemnatural-enemypredatorparasitepathogensymbiontgut-microbiomesoil-ingestionfitness-benefitreproductive-successsperm-morphologytesticular-morphologyaccessory-glandpheromone-blendspecies-specific-odorcherry-scentvanilla-scentcinnamon-scentrose-scentolfactory-communicationmate-locationmate-recognitionsexual-selectionmale-male-competitionweapon-morphologyallometrydevelopmental-plasticitynymphal-instaregg-barrelegg-arrangementlinear-ovipositionleaf-surfaceplant-tissuestylet-penetrationenzymatic-digestionfluid-feedingphloem-feedingxylem-feedingseed-feedingcone-feedingfruit-feedingkernel-feedingnut-feedingcrop-feedinghost-plant-rangepolyphagyoligophagyspecialistgeneralistpest-statusdamage-thresholdeconomic-injury-levelmanagement-strategycultural-controlphysical-controlchemical-controlresistancetolerancehost-plant-resistancemonitoring-traplight-trappopulation-densitydistribution-mapspread-ratecolonizationestablishmentpopulation-dynamicslife-tabledevelopmental-ratethermal-requirementsdegree-daysphenologyvoltinismunivoltinebivoltinemultivoltinegeneration-timeoverwintering-sitehibernaculumshelter-seekingcold-hardinessfreeze-tolerancesupercoolingwater-relationsdesiccation-resistancestarvation-resistancedispersal-abilityflight-capacitywalking-behaviorclimbing-behavioraggregation-pheromonealarm-pheromonestink-glandmetathoracic-glanddorsoabdominal-glandventral-abdominal-glandsexual-glandmorphological-defensechemical-defensemechanical-defenseautotomyleg-losspredation-riskparasitism-riskparasitoid-riskpathogen-riskcompetitionintraspecificinterspecificresource-competitionmating-competitionsperm-competitioncryptic-female-choicereproductive-isolationspeciationphylogenysystematicstaxonomymorphologyanatomyhistologyultrastructurespermatogenesisspermatozoasperm-lengthnuclear-lengthcyst-productionfollicle-numbertestis-structurereproductive-anatomygenitaliamating-behaviorcopulationinseminationovipositionegg-productionfecundityfertilityhatching-successnymphal-survivaladult-longevitysex-ratiooperational-sex-ratiopopulation-sex-ratioeffective-population-sizegenetic-diversitygene-flowpopulation-structurephylogeographybiogeographyhistorical-biogeographyvicariancedispersalrange-shiftrange-contractionaltitudinal-distributionlatitudinal-distributionlongitudinal-distributionisland-distributioncontinental-distributionendemismcosmopolitanismintroduced-rangenative-rangesource-populationfounder-populationinvasion-frontlag-phaseestablishment-phasespread-phaseequilibrium-phaseimpact-assessmentrisk-assessmenthorizon-scanningearly-warningrapid-responseeradicationcontainmentcontrolmanagementadaptationmitigationrestorationconservationbiodiversityecosystem-serviceecosystem-functionfood-webtrophic-levelprimary-consumerherbivorefruit-predatorplant-animal-interactionmutualismantagonismpredationparasitismcommensalismamensalismfacilitationindirect-interactiontrait-mediated-interactiondensity-mediated-interactionbehavioral-ecologyevolutionary-ecologyfunctional-ecologyphysiological-ecologypopulation-ecologycommunity-ecologyecosystem-ecologylandscape-ecologymacroecologyglobal-ecologyapplied-ecologyagricultural-ecologyforest-ecologyconservation-biologyinvasion-ecologyrestoration-ecologypest-managementconserv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nchanmoss-bugarchaeorrhynchanfulgoromorphancicadomorphanmembracoidtreehopperleafhopperplanthopperpsyllidjumping-plant-lousewhiteflyaleyrodidscale-insectcoccoidmealybugaphidadelgidphylloxeransternorrhynchanthysanopteranthripspsocopteranbarklousebooklousephthirapteranlousesucking-lousechewing-lousemallophagananoplurandermapteranearwigblattodeancockroachtermiteisopteranmantodeanmantidphasmidstick-insectleaf-insectorthopterangrasshopperlocustkatydidcricketmole-cricketpygmy-mole-cricketcamel-cricketcave-cricketwetaensiferancaeliferangryllotalpidmyrmecophilidtettigoniidgryllidacrididpamphagidpneumoridlentulidtristirideumastacidproscopiidtridactylidtetrigidgrouse-locustpygmy-grasshopperplecopteranstoneflyembiopteranwebspinnerzorapteranangel-insectdictyopteranPachypsylla celtidisvesicula
hackberry blistergall psyllid
Pachypsylla celtidisvesicula, commonly called the hackberry blistergall psyllid, is a species of aphalarid psyllid native to North America. The nymphs induce distinctive blister-like galls on the leaves of various hackberry species (Celtis spp.), within which they develop through five instars before emerging as adults. Adults strongly resemble the related hackberry nipplegall psyllid (Pachypsylla celtidismamma) but can be distinguished by the gall type their nymphs produce. Like other hackberry psyllids, adults overwinter in concealed locations and can become a temporary nuisance when they aggregate on building exteriors in fall.
Pentatomidae
stink bugs, shield bugs
Pentatomidae is the largest family in the superfamily Pentatomoidea, comprising approximately 900 genera and over 4,700 species. Members are commonly known as stink bugs or shield bugs, distinguished by their ability to release defensive secretions when disturbed. The family exhibits diverse feeding strategies: most species are phytophagous and include major agricultural pests, while members of the subfamily Asopinae are predatory. The family name derives from Greek 'pente' (five) and 'tomos' (section), referring to the five-segmented antennae characteristic of all pentatomids.
Platycryptus undatus
Tan Jumping Spider, Familiar Jumping Spider
A native North American jumping spider known for its mottled tan coloration and distinctive chevron patterning on the abdomen. Females measure 10–13 mm and males 8.5–9.5 mm. Frequently encountered on vertical surfaces such as tree trunks and building walls. Generally reluctant to bite, delivering defensive bites only when squeezed or pinched.
Psyllobora vigintiduopunctata
22-spot ladybird, 22-spot lady beetle
A small European lady beetle, 3–5 mm in length, distinguished by its bright yellow elytra with 22 black spots. It is the only British and Irish ladybird species where pupa, larva, and adult share similar coloration and pattern. Unlike most coccinellids that prey on aphids, this species is a mycophage specializing on powdery mildew fungi. The species was first described in 1758 by Linnaeus and has been recorded overwintering in aggregations of up to 500 individuals.