Alternation-of-generations
Guides
Aceria fraxini
Ash Bead Gall Mite
Aceria fraxini, commonly known as the ash bead gall mite, is an eriophyid mite that induces distinctive capsule galls on ash trees (Fraxinus spp.). This species exhibits a complex life cycle involving alternation of generations, with an overwintering generation consisting solely of parthenogenetic females (deutogynes) and a summer generation containing both sexes (protogynes and males). The mite is distributed across North America, where it is considered a minor pest of ornamental and native ash species.
Amphibolips acuminata
Fusiform Oak Apple Gall Wasp
Amphibolips acuminata is a species of gall wasp in the family Cynipidae, commonly known as the Fusiform Oak Apple Gall Wasp. The species induces distinctive galls on oak trees, specifically forming fusiform (spindle-shaped) oak apple galls. As with other members of the genus Amphibolips, this species has an alternation of generations with distinct sexual and asexual forms that produce different gall types. The species is associated with oaks in the genus Quercus and has been documented across a broad geographic range in North America.
Andricus opertus
Fimbriate Gall Wasp
Andricus opertus is a cynipid gall wasp that induces distinctive galls on California oaks. The species exhibits alternation of generations, with bisexual and unisexual forms producing different gall types. The bisexual generation creates elongate, spiky leaf galls, while the unisexual generation forms aborted bud galls. This species is part of the highly diverse Andricus genus, which contains numerous oak-associated gall wasps.
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-1930Callirhytis balanopsis
Callirhytis balanopsis is a species of gall wasp in the family Cynipidae. The species induces galls on oak hosts, continuing the genus's well-documented association with Quercus species. Like other Callirhytis species, it exhibits a complex life cycle with alternating sexual and asexual generations that produce distinct gall types. The specific epithet 'balanopsis' references the acorn-like appearance of its galls.
Cynipoidea
Gall Wasps and Allies
Cynipoidea is a superfamily of small wasps comprising approximately 3,000 described species across seven extant families, with many undescribed species estimated. The group exhibits diverse life histories: while the family Cynipidae (gall wasps) are phytophagous and induce plant galls, the majority of species are parasitoids or hyperparasitoids of other insects. The superfamily is taxonomically challenging, with family-level identification historically difficult until the publication of a comprehensive illustrated key in 2020.
parasitoidgall-formerhyperparasitoidbiological-controloak-forestinquilinealternation-of-generationsundescribed-diversityreduced-wing-venationHymenopteraApocritaecosystem-engineerplant-manipulationforest-insectagricultural-pest-controlDrosophila-suzukiiaphid-hyperparasitoidwood-borer-parasitoiddung-breeding-fly-parasitoidtaxonomic-keygall-communitynutrient-cyclingphenologysexual-dimorphismparthenogenesiskoinobiontidiobiontPalaearctic-diversityNearctic-diversityMediterranean-hotspotoak-gallrosinweed-gallgoldenrod-gallintroduced-speciesadventive-faunaNew-Zealand-faunaTurkish-faunabroadleaf-forestprairie-habitatagricultural-systemsoft-fruit-pestintegrated-pest-managementbiocontrol-agentextension-entomologymicrohymenopteramorphological-keycouplet-identificationmetasomal-fusionpetiole-reductionglossy-integumentcompressed-bodyprognathous-headflagellomere-reductionnotauli-reductionpterostigma-presencehamuli-presenceovipositor-structurehypopygium-developmentlarval-chamberlocularity-formationhost-genome-exploitationroom-service-nutritiondefensive-immune-suppressionSWD-biocontroleucoiline-waspcharipine-hyperparasitoidanacharitine-parasitoidemarginine-parasitoidfigitine-parasitoidibaliine-parasitoidliopterine-parasitoiddiplolepidine-gall-formerpediaspine-gall-formeraulacideine-gall-formeraylacine-gall-formerceroptresine-inquilinecynipine-gall-formerdiastrophine-gall-formereschatocerine-gall-formerphanacidine-gall-formerqwaqwaiine-gall-formersynergine-inquilineBeringian-biogeographyEocene-forest-separationclimate-change-habitat-shiftphenological-form-associationearly-oak-phenoformlate-oak-phenoformQuercus-robur-gall-communityQuercus-cerris-gall-communityQuercus-ilex-gall-communityAsteraceae-gall-formerEucalyptus-gall-formerRosaceae-gall-formerFagaceae-gall-formerBrevicoryne-brassicae-hyperparasitoidAphidiinae-hyperparasitoidAphelinus-hyperparasitoidOphelimus-parasitoidMikeius-parasitoidAntistrophus-gall-formerNeuroterus-gall-formerAndricus-gall-formerCynips-gall-formerDiplolepis-gall-formerCallirhytis-gall-formerSaphonecrus-inquilineSynergus-inquilineLithosaphonecrus-inquilineCerroneuroterus-gall-formerParaganaspis-parasitoidTriplasta-parasitoidConeucoela-parasitoidAlloxysta-hyperparasitoidPhaenoglyphis-hyperparasitoidXyalaspis-adventiveGanaspis-adventiveThoreauella-adventiveAnacharis-nativeKleidotoma-nativeTrybliographa-groupKleidotoma-groupGronotoma-groupRhoptromeris-groupGanaspis-groupChrestosema-groupZaeucoila-groupAfrotropical-lineageNeotropical-lineageleaf-mining-agromyzid-parasitoidagromyzid-parasitoidcabbage-aphid-hyperparasitoidbovine-dung-dipteran-parasitoidcattle-dung-parasitoidpasture-ecosystem-serviceforest-biodiversity-indicatorcollection-based-taxonomymolecular-phylogeneticscladistic-analysisimplied-weights-parsimonyskeletal-character-codingdigital-image-databaseInternet-accessible-databasehigher-level-phylogenygeneric-classification-revisiongenus-group-systeminformal-genus-groupssynapomorphy-discussionhost-parasitoid-coevolutionevolutionary-radiationtropical-parasitoid-diversitybiodiversity-documentationscientific-nomenclatureetymological-analysishost-based-species-naminggeographic-namingmorphological-namingdedication-namingtaxonomic-communicationbiodiversity-informaticsfaunistic-surveynew-country-recordnew-provincial-recordnew-genus-recordnew-species-descriptionspecies-redescriptiondichotomous-key-constructioncharacter-coupletillustrated-identificationmicroscope-photographyspecimen-imagingstudent-tested-keyexpert-consultationproofed-keyextension-entomology-applicationstakeholder-educationforest-managementfarm-managementfield-managementecosystem-service-valuationfuture-policy-implementationmicrohymenopteran-collectiondiagnostic-indicator-applicationobjective-setting-for-conservationclimate-change-monitoringhabitat-fragmentation-responseoak-stand-compositionurban-oak-forestnursery-oak-cultivationgeomorphic-topographic-structure-influencespecies-richness-patterndistribution-mappinghost-plant-documentationgall-morphology-documentationseasonal-gall-collectionmulti-year-field-studyprovince-level-inventoryregional-fauna-characterizationcountry-level-checklistglobal-fauna-overviewadventive-species-dominancedeliberate-introduction-historybiological-control-introductionnative-species-rarityendemic-species-presencecollection-revisiontype-specimen-examinationreared-specimen-basisdiagnosis-illustrationdistribution-data-compilationhost-relation-discussionbiology-documentationnatural-history-summarytaxonomic-overview-provisionfaunal-knowledge-gap-identificationresearch-accessibility-improvemententry-barrier-reductioncool-thing-discovery-enablementDiplolepis
gall wasps, rose gall wasps
Diplolepis is a genus of gall-inducing wasps in the family Diplolepididae, most commonly associated with roses (Rosa spp.). These small wasps are notable for inducing complex, often conspicuous galls on their host plants through chemical manipulation of plant tissues. The genus includes both sexual and parthenogenetic species, with some like D. rosae reproducing primarily by thelytokous parthenogenesis. Diplolepis species exhibit intricate life cycles involving alternation between sexual and agamic generations, and their galls support diverse communities of parasitoids and inquilines.
Diplolepis gracilis
Diplolepis gracilis is a species of gall wasp in the family Diplolepididae, first described by Ashmead in 1897. Like other members of its genus, it induces the formation of galls on host plants, likely within the rose family (Rosaceae) given the genus's strong association with this plant group. The species is recorded from multiple provinces across Canada including Alberta, British Columbia, Manitoba, and Ontario. As with most Diplolepis species, it exhibits a complex life cycle involving an alternation between sexual and parthenogenetic generations.
Diplolepis rosaefolii
Diplolepis rosaefolii is a gall wasp in the family Cynipidae that induces distinctive lenticular (lens-shaped) galls on the leaves of rose plants across Canada. The species exhibits an alternation of generations life cycle typical of cynipid wasps, with a bisexual spring generation producing the visible galls and an agamic (asexual) winter generation of wingless females. In Ontario and Quebec, it is primarily associated with native Rosa acicularis, though populations have been documented on the cultivated hybrid rugosa shrub rose 'Thérèse Bugnet'. The galls support a diverse component community including multiple parasitoid wasp species and inquilines.
Disholandricus lasius
Disholandricus lasius is a cynipid gall wasp species that induces galls on oak hosts. Formerly classified in the genus Andricus, this species was reassigned to Disholandricus based on phylogenetic and morphological studies. Like other members of the Cynipidae family, the wasp manipulates host plant tissue to form a protective structure that houses and nourishes its developing larvae. The species exhibits the complex life cycle typical of oak gall wasps, involving both sexual and asexual generations that alternate between different plant structures or host species.
Disholcaspis
Disholcaspis is a genus of gall wasps in the family Cynipidae containing more than 40 described species. Species in this genus induce characteristic galls on oak trees (Quercus spp.), with gall morphology varying by species and generation. Some species produce galls that secrete honeydew, establishing facultative mutualisms with ants that defend the galls from parasitoids. The genus exhibits heterogony, with alternating sexual and parthenogenetic asexual generations that typically produce different gall forms.
Disholcaspis cinerosa
Mealy oak gall wasp
Disholcaspis cinerosa, commonly known as the mealy oak gall wasp, is a species of gall wasp in the family Cynipidae. It induces distinctive galls on oak trees (Quercus spp.), specifically known as "mealy oak galls." The species has been documented to possess exceptionally large venom glands relative to its body size—when unfolded, the venom gland is approximately 10 times longer than the abdomen—making it a notable subject in studies of gall induction mechanisms. Like other cynipid wasps, it exhibits an alternation of generations life cycle with both sexual and asexual (parthenogenetic) generations.
Disholcaspis lacuna
Disholcaspis lacuna is a species of gall wasp in the family Cynipidae. Like other members of its genus, it induces the formation of characteristic galls on oak trees (Quercus spp.). The species exhibits the typical cynipid life cycle involving alternation of generations, with separate sexual and parthenogenetic (agamic) generations that produce distinct gall forms. Its biology and gall morphology are less documented than those of congeners such as D. quercusmamma and D. quercusglobulus.
Disholcaspis pedunculoides
Disholcaspis pedunculoides is a species of gall wasp in the family Cynipidae, described by Weld in 1926. Like other members of the genus Disholcaspis, it induces gall formation on oak trees (Quercus spp.), though specific host associations and gall morphology for this species remain poorly documented in published literature. The species follows the typical cynipid life cycle with alternating sexual and asexual generations.
Disholcaspis perniciosa
Disholcaspis perniciosa is a gall wasp species in the family Cynipidae, first described by Bassett in 1890. As a member of the genus Disholcaspis, it is part of a diverse group of oak-associated gall wasps found in North America. The genus is known for producing distinctive bullet-shaped or spherical galls on oak trees. Like other cynipids, this species likely exhibits an alternation of generations life cycle with both sexual and agamic (asexual) generations producing different gall types on their host plants.
Disholcaspis quercusmamma
oak rough bulletgall wasp
Disholcaspis quercusmamma, the oak rough bulletgall wasp, is a cynipid gall wasp that induces distinctive bullet-shaped galls on twigs of white oaks. The species exhibits an alternation of generations with sexual and asexual phases, each producing morphologically different galls. The fall bullet galls are large, conspicuous structures with a velvety surface and pointed apex, while spring galls are small and inconspicuous on leaf buds. This wasp possesses notably enlarged venom glands, with the venom reservoir occupying approximately one-third of abdominal volume, implicating venom compounds in gall induction.
Disholcaspis quercusomnivora
Disholcaspis quercusomnivora is a species of gall wasp in the family Cynipidae, described by Ashmead in 1885. Like other members of the genus Disholcaspis, this species induces distinctive galls on oak trees (Quercus spp.), though specific gall morphology and host associations for this particular species are not well documented in available sources. The genus is known for producing hard, bullet-shaped or spherical galls on oak twigs and branches. As with many cynipid wasps, D. quercusomnivora likely exhibits an alternation of generations life cycle with both sexual and asexual phases.
Disholcaspis quercusvirens
Disholcaspis quercusvirens is a cynipid gall wasp that induces galls on live oak trees (Quercus virginiana). The species exhibits an alternation of generations life cycle with distinct sexual and asexual phases. It is one of numerous oak-associated gall wasps in North America, with its biology and management studied in the context of ornamental and native live oak systems.
Disholcaspis simulata
Dried Peach Gall Wasp
Disholcaspis simulata is a species of gall wasp in the family Cynipidae, first described by Alfred C. Kinsey in 1922. Like other members of its genus, this species induces the formation of characteristic galls on oak trees (Quercus spp.). The species exhibits the complex alternation of generations typical of many cynipid wasps, with both sexual and agamic (parthenogenetic) generations. The specific epithet 'simulata' and common name 'Dried Peach Gall Wasp' suggest the gall's resemblance to a dried peach in appearance.
Feron crystallinum
Crystalline Gall Wasp
Feron crystallinum is a cynipid gall wasp that induces distinct galls on oak species in California. The species exhibits complex alternation of generations, producing different gall morphologies and wasp forms across seasonal cycles. The parthenogenic generation forms large, pink, hairy galls on leaf undersides, while the bisexual generation produces smaller, less hairy galls. Formerly classified as Andricus crystallinus, this species has been reclassified to the genus Feron based on phylogenetic relationships.
Philonix fulvicollis
Philonix fulvicollis is a gall wasp species in the family Cynipidae, first described by Fitch in 1859. It has an alternation of sexual and asexual generations, a phenomenon confirmed through molecular analysis of cytb and ITS2 sequences. The species is distributed across eastern and central North America, with records from the United States and Canada. Like other cynipid wasps, it induces gall formation on host plants, though specific host associations require further documentation.