Cynipini
Guides
Acraspis quercushirta
jewel oak gall wasp
Acraspis quercushirta, the jewel oak gall wasp, is a North American cynipid wasp that induces distinctive, detachable galls on white oak leaves. The species exhibits a complex life cycle with alternating sexual and asexual generations, each producing morphologically different galls. The sexual generation forms the namesake "jewel" galls—oval, faceted structures ranging from white to brown that detach and fall with leaves in autumn. Molecular studies have confirmed its conspecific status with A. macrocarpae, which was previously considered a separate species.
Amphibolips ilicifoliae
Amphibolips ilicifoliae is a species of gall wasp in the family Cynipidae that induces galls on oak leaves. It is one of numerous Amphibolips species associated with oaks in North America. The species is distinguished by its specific host association with certain oak groups and the morphology of the galls it produces. Like other cynipid gall wasps, it has a complex life cycle involving both sexual and asexual generations, though details specific to this species remain incompletely documented.
Andricus burnetti
Andricus burnetti is a species of gall wasp in the family Cynipidae, a group renowned for inducing diverse and structurally complex galls on oak trees. As a member of the genus Andricus, this species participates in the intricate life cycle characteristic of cynipid wasps, where females lay eggs in oak tissues and the developing larvae secrete substances that redirect plant growth to form specialized galls. The species was described by Burnett, for whom it is named. Like many Andricus species, it likely exhibits host specificity to particular oak species, though detailed biological accounts remain limited in published literature.
Atrusca
Atrusca is a genus of gall wasps in the family Cynipidae, tribe Cynipini, comprising approximately 42 species distributed across North and Central America. These tiny wasps are specialized herbivores that induce characteristic galls on oak (Quercus) host plants. The genus forms a phylogenetically distinct clade most closely related to Cynips, Philonix, and Xanthoteras, and morphologically resembles Cynips and Antron. Species exhibit high host specificity, with each typically restricted to one or a few closely related oak species.
gall-waspCynipidaeoak-gallQuercusherbivoreparasitoidNorth-AmericaMexicoCentral-AmericaCynipiniinduced-gallplant-insect-interactionhost-specificityalternation-of-generationsasexual-reproductionsexual-reproductionecosystem-engineerinquilinehyperparasitoidbella-species-complexphylogeneticstaxonomyKinsey-1930Belonocnema
Belonocnema is a genus of cynipid gall wasps restricted to the southeastern United States. The genus comprises three recognized species that induce distinct galls on section Virentes oaks, including live oaks. All species exhibit heterogony, with alternating sexual and asexual generations producing morphologically and ecologically different gall types. The genus has been subject to taxonomic revision, with Dryorhizoxenus now synonymized under Belonocnema.
Callirhytis flavipes
Callirhytis flavipes is a species of gall wasp in the family Cynipidae. Species in this genus are known to induce galls on oak trees (Quercus spp.). The genus Callirhytis is part of the tribe Cynipini, which comprises the oak gall wasps. Specific biological details for C. flavipes remain poorly documented in accessible literature.
Ceroptres
Ceroptres is a genus of gall wasps in the tribe Ceroptresini (Cynipidae). The genus includes 43 described species, of which 40 are known from North America. Ceroptres species are inquilines: they do not induce their own galls but instead oviposit into galls formed by other organisms. Host galls are primarily those induced by other gall wasps (Cynipini), though some species use galls formed by gall midges (Cecidomyiidae). Species are host specialists, typically associated with a single host gall species or with several phylogenetically or ecologically related galls.
Cynips
oak gall wasps
Cynips is a genus of gall wasps comprising approximately 39 species, all associated with oak trees (Quercus spp.). The genus includes the well-known common oak gall wasp (C. quercusfolii), which induces spherical galls on oak leaf undersides. Species in this genus exhibit heterogony, alternating between sexual and asexual generations that typically produce morphologically distinct galls. The genus was established by Linnaeus in 1758 and remains taxonomically stable, though some former members (such as Antron) have been reinstated as separate genera.
Disholcaspis prehensa
clasping twig gall wasp
Disholcaspis prehensa is a gall-inducing cynipid wasp native to California that induces distinctive galls on scrub oak and leather oak. The species exhibits heterogony, alternating between sexual and asexual generations that produce two morphologically different gall types. The asexual generation forms conspicuous mushroom-shaped twig galls with clasping bases, while the sexual generation produces small, hidden bud galls.
gall-waspcynipidheterogonyparthenogenesisoak-gallCalifornia-endemicant-mutualismDisholcaspisCynipidaeHymenopteraQuercusinduced-plant-structurephloem-sap-exudationbiological-mutualismseasonal-dimorphismsexual-dimorphismgall-dimorphismagamic-generationsexual-generationclasping-twig-gallbud-galltwig-gallnative-California-speciesscrub-oakleather-oakparasitoid-defenseant-plant-interactioninsect-plant-interactionplant-manipulationevolution-of-asexualityWeld-1957Zootaxa-4859molecular-systematicshost-plant-specificityCynipinioak-woodlandchaparralinsect-gallgall-morphologygall-colorationsun-exposure-effectslarval-chamberemergence-timingspring-emergencelate-winter-emergencegall-developmentoviposition-behavioregg-laying-in-budsegg-laying-in-twigsfemale-only-generationwingless-femalewinged-sexual-generationgall-size-dimorphismgall-shape-dimorphismhidden-gallexposed-gallgall-wasp-life-cyclecynipid-biologygall-wasp-taxonomygall-wasp-identificationgall-wasp-ecologyinsect-plant-coevolutionplant-growth-manipulationhormone-mediated-gall-inductionvenom-glandaccessory-glandsecretory-structuresgall-induction-mechanismgall-chemistryphloem-saphoneydewant-attractionant-protectionparasitoid-waspnatural-enemy-defenseindirect-defensemutualistic-interactiontrophic-cascadecommunity-ecologyspecies-interactionecosystem-engineerhabitat-modificationfood-webinsect-diversityCalifornia-biodiversityendemic-insectregional-endemismoak-specialistplant-specialistmonophagousoligophagoushost-rangehost-plant-evolutiongall-wasp-radiationadaptive-radiationevolutionary-innovationreproductive-strategyasexual-reproductionthelytokyarrhenotokysex-determinationdevelopmental-biologyinsect-morphologyinsect-anatomyfemale-morphologyovipositorstingeregg-injectionplant-tissue-manipulationcell-proliferationplant-hormoneauxincytokiningene-expressiontranscriptomicsproteomicsvenom-compositionbiochemistryphysiologyethologybehavioral-ecologypopulation-biologypopulation-dynamicsseasonalityphenologyclimate-effectsmicrohabitatniche-specializationconservation-biologyimperiled-habitatoak-woodland-conservationchaparral-conservationfire-ecologysuccessiondisturbancehabitat-fragmentationurbanizationagricultural-conversioninvasive-speciesclimate-changerange-shiftphenological-shiftcitizen-scienceiNaturalistobservation-dataspecies-distributionoccurrence-recordsbiodiversity-informaticstaxonomic-revisionspecies-descriptiontype-specimenmolecular-dataDNA-barcodingphylogeneticssystematicsevolutionary-historybiogeographydispersalvicariancespeciationspecies-conceptscryptic-speciesspecies-complexmorphological-variationgeographic-variationphenotypic-plasticitygenetic-variationpopulation-geneticsconservation-geneticsrestoration-ecologyhabitat-restorationmanaged-relocationassisted-migrationex-situ-conservationin-situ-conservationprotected-areanatural-reservestate-parknational-parkwilderness-areabiosphere-reserveUNESCOIUCNred-listspecies-assessmentconservation-statusdata-deficientresearch-priorityknowledge-gapfuture-researchgall-wasp-venomgall-wasp-glandsecretory-evolutiongall-wasp-phylogenyCynipidae-evolutionHymenoptera-phylogenyinsect-evolutiongall-evolutionplant-insect-interaction-evolutioncoevolutionary-arms-racemutualism-evolutiondefense-evolutioncounter-defenseenemy-free-spaceenemy-escapeecological-releaseadaptive-peakfitness-landscapeevolutionary-constraintevolutionary-trade-offlife-history-evolutionreproductive-allocationfecunditysurvivaldevelopment-timegeneration-timevoltinismunivoltinebivoltinemultivoltinediapauseoverwinteringcold-hardinessstress-tolerancedesiccation-resistancestarvation-resistanceimmune-responseparasitoid-resistancepathogen-resistancesymbiontmicrobiomegut-microbiotaendosymbiontWolbachiaRickettsiaCardiniumSpiroplasmabacterial-symbiontfungal-symbiontviral-symbiontmutualistic-microbeparasitic-microbecommensal-microbemicrobial-communitymetagenomicsmicrobial-ecologyhost-microbe-interactionimmune-systeminnate-immunityacquired-immunityhumoral-immunitycellular-immunityantimicrobial-peptidereactive-oxygen-speciesnitric-oxidemelanizationencapsulationnodulationphagocytosisautophagyapoptosisprogrammed-cell-deathstress-responseheat-shock-proteinoxidative-stresshypoxiaanoxiametabolic-raterespirationenergy-budgetnutrient-allocationlipid-storageglycogen-storageprotein-storageamino-acid-metabolismcarbohydrate-metabolismlipid-metabolismnitrogen-metabolismexcretionosmoregulationion-transportwater-balancecuticleintegumentsclerotizationpigmentationcolor-patternstructural-coloriridescencebioluminescencephotoreceptorvisioncompound-eyeocellusantennaolfactiongustationchemoreceptionmechanoreceptionthermoreceptionhygroreceptionproprioceptionneurobiologybrainganglionnerveneuronsynapseneurotransmitterhormonepheromoneallomonekairomonesemiochemicalchemical-ecologycommunicationsignalingmate-choicesexual-selectionsperm-competitioncryptic-female-choicemating-systemmating-behaviorcourtshipcopulationinseminationfertilizationovipositionegg-layingparental-carematernal-effectpaternal-effectepigeneticsgen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coxii
Kokkocynips coxii is a Nearctic gall wasp species originally described as Cynips coxii by Bassett in 1881 and later transferred from Dryocosmus to Kokkocynips in 2021 based on morphological and molecular phylogenetic evidence. It is one of six Nearctic species reclassified into Kokkocynips, expanding a genus previously considered monotypic and restricted to Mexico. The species induces galls on red oaks.
Kokkocynips imbricariae
Banded Bullet Gall Wasp
Kokkocynips imbricariae is a gall wasp species in the tribe Cynipini, transferred from Dryocosmus to Kokkocynips in 2021 based on molecular and morphological evidence. It induces galls on red oaks (Quercus section Lobatae) and is distributed in the Nearctic region. The species was originally described by Ashmead in 1896.
Loxaulus
Loxaulus is a genus of gall wasps in the family Cynipidae, tribe Cynipini. Members are small, specialized insects that induce the formation of plant galls on host plants. The genus was established by Mayr in 1881. As with other cynipine gall wasps, species likely exhibit complex life cycles involving alternating sexual and asexual generations on different host plants, though detailed studies remain limited.
Trigonaspis
Trigonaspis is a genus of cynipid wasps in the family Cynipidae, tribe Cynipini. These insects are gall wasps that induce galls on host plants. The genus was established by Hartig in 1840 and is part of the diverse radiation of oak gall wasps and related lineages.
Trigonaspis radicola
Trigonaspis radicola is a species of gall wasp in the family Cynipidae. The species is known for inducing root galls on oak species (Quercus), distinguishing it from many cynipids that form galls on above-ground plant parts. Like other members of the tribe Cynipini, it has a complex life cycle involving alternating sexual and asexual generations, typically associated with different oak host species or plant structures. The species name 'radicola' (meaning 'root-dwelling') reflects its distinctive subterranean gall-forming habit.
Zapatella quercusmedullae
Oak Rough Bulletgall Wasp
Zapatella quercusmedullae is a gall wasp in the family Cynipidae that induces galls on oak trees (Quercus). The species was transferred from Andricus to Zapatella based on phylogenetic studies. It produces distinctive bullet-shaped galls on twigs and branches of host oaks. The wasp has an alternating sexual and asexual generation life cycle typical of many Cynipini.
Zapatella quercusphellos
Zapatella quercusphellos is a species of gall wasp in the family Cynipidae. It is known to induce galls on oaks (Quercus species). The species was described by Carl Robert Osten Sacken and has been documented in the northeastern United States. It belongs to a genus of cynipid wasps specialized on oak hosts.