Heterogony

Guides

Amphibolips cookii
Oak Apple Gall Wasp
Amphibolips cookii is a cynipid gall wasp that induces the formation of oak apple galls on oak trees. The species is widely distributed in North America and has been documented extensively through community science observations. Its life cycle involves an alternation of generations between sexual and asexual forms, a trait common among Cynipidae but with specific host associations for this species. The wasp itself is small and inconspicuous; its primary visibility comes from the distinctive galls it produces on oak foliage.
gall-wasp Cynipidae oak-gall heterogony North-America
Andricus
oak gall wasps
Andricus is a large and diverse genus of gall wasps in the family Cynipidae, comprising approximately 375 species—though many are considered taxonomically dubious. These tiny wasps are obligate gall inducers on oaks (Quercus spp.), with each species typically restricted to one or a few closely related host species. The genus exhibits complex life cycles involving alternation between sexual and asexual generations, often on different oak hosts or plant organs. Andricus is the most diverse genus in the tribe Cynipini and has a cosmopolitan distribution centered on the Northern Hemisphere, with species in Europe, Asia, North America, and Central America.
gall-wasp Cynipidae oak Quercus heterogony parthenogenesis plant-insect-interaction coevolution speciation parasitoid-host
Andricus pisiformis
Andricus pisiformis is a species of cynipid gall wasp in the tribe Cynipini, first described by Beutenmüller in 1911. Like other members of its genus, this wasp induces characteristic galls on oak trees (Quercus spp.). The species name 'pisiformis' refers to the pea-like shape of the galls it produces. As with many Andricus species, it exhibits a complex life cycle typically involving alternation between sexual and asexual generations on different oak hosts or plant parts, though specific details for this species remain incompletely documented.
gall-wasp cynipid oak-gall heterogony parthenogenesis plant-manipulation
Bassettia flavipes
Bassettia flavipes is a gall wasp in the family Cynipidae that induces galls on oaks, particularly Quercus macrocarpa (bur oak). This species exhibits an alternation of generations between sexual and asexual forms, a trait now confirmed through molecular data. It was originally described from the sexual generation by Gillette in 1889 and was later transferred from the genus Neuroterus to Bassettia based on genetic and morphological evidence. The species is distributed across the northern United States and southern Canada.
gall-wasp cynipid oak-gall alternating-generations heterogony Quercus bur-oak
Belonocnema
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.
cynipidae gall-wasp oak-gall heterogony inquiline parasitoid hyperparasitoid section-virentes live-oak root-gall leaf-gall southeastern-united-states endemic gustav-mayr 1881 dryorhizoxenus-synonym cynipini
Callirhytis
Callirhytis is a genus of gall wasps comprising more than 90 described species, all members of the family Cynipidae. These wasps are specialized herbivores that induce the formation of galls on oak trees (Quercus spp.) in North America. The genus exhibits complex life cycles with alternating sexual and asexual generations, often producing morphologically distinct galls. Callirhytis species are among the most extensively studied cynipids due to their ecological importance and the structural diversity of their galls.
gall-wasp oak-gall Cynipidae North-America heterogony parthenogenesis plant-insect-interaction
Callirhytis clavula
Callirhytis clavula is a species of gall wasp in the family Cynipidae, known to induce galls on oak trees (Quercus). Like other members of the genus Callirhytis, it exhibits a complex life cycle involving alternating generations that produce different gall types on different plant tissues. The species is native to eastern North America, with records from Canada and the United States. Specific details of its gall morphology and biology remain poorly documented in the primary literature.
gall-wasp cynipid oak-gall heterogony parthenogenesis Quercus
Callirhytis furva
Callirhytis furva is a species of gall wasp in the family Cynipidae. Like other members of the genus Callirhytis, it induces galls on oak trees (Quercus spp.). The species exhibits the complex life cycle typical of many cynipid wasps, with alternating sexual and asexual generations that often produce distinct gall morphologies on different plant tissues.
gall-wasp cynipid oak-gall Hymenoptera heterogony Quercus
Callirhytis gallaestriatae
Callirhytis gallaestriatae is a species of gall wasp in the family Cynipidae. As with other members of this genus, it induces galls on oak hosts (Quercus species). The species exhibits the complex life cycle typical of many cynipids, with alternating sexual and asexual generations that often produce morphologically distinct galls. The specific epithet "gallaestriatae" suggests association with galls bearing striations or stripes.
gall-wasp cynipid oak-gall heterogony Quercus
Callirhytis pigra
oak midrib gall
A cynipid gall wasp that induces distinctive galls on oak leaves. The species exhibits the typical complex life cycle of oak gall wasps, with alternating sexual and asexual generations that produce different gall morphologies on different oak tissues. The common name refers to the gall's position along the leaf midrib.
cynipidae gall-wasp oak-gall heterogony leaf-gall midrib-gall
Callirhytis quercuscornigera
Horned Oak Gall Wasp
Callirhytis quercuscornigera, the horned oak gall wasp, is a cynipid wasp that forms distinctive woody galls on oak twigs. The species exhibits complex heterogony—a cyclical parthenogenesis with alternating sexual and asexual generations that produce different gall types on different oak tissues. The horned twig galls are large, woody structures with conspicuous horn-like projections through which adult wasps emerge. Heavy infestations have been documented to contribute to decline and mortality of pin oaks, particularly in urban and suburban settings.
gall-wasp cynipid oak-pest heterogony parthenogenesis forest-entomology urban-pest
Callirhytis quercusfutilis
Oak Wart Gall Wasp
Callirhytis quercusfutilis is a cynipid gall wasp known for inducing distinctive wart-like galls on white oak group oaks. The species exhibits a complex life cycle with alternating generations: an asexual generation that develops in scurfy bark at the base of host tree trunks or roots, and a sexual generation that produces leaf galls. The species is restricted to central and eastern North America and is specifically associated with oaks in the Quercus section Quercus (white oaks).
gall-wasp oak-gall cynipid heterogony white-oak leaf-gall bark-gall
Callirhytis quercusgemmaria
Callirhytis quercusgemmaria is a gall wasp in the family Cynipidae that induces galls on oak (Quercus) species. Like other members of the genus Callirhytis, this species has a complex life cycle involving alternating generations that produce different gall types on different parts of the host plant. The specific epithet 'quercusgemmaria' refers to its association with oak buds or gemmae. This species is part of the highly diverse oak gall wasp fauna of North America, where more than 1,300 cynipid species have been described, most with intimate host relationships with particular oak species.
gall-wasp cynipid oak-gall heterogony parthenogenesis plant-insect-interaction
Callirhytis quercusmodesta
Callirhytis quercusmodesta is a species of gall wasp in the family Cynipidae. The species induces galls on oaks (Quercus spp.) as part of its life cycle. Like other members of the genus Callirhytis, it exhibits heterogony, with alternating sexual and asexual generations that produce morphologically distinct galls. The species is known from the central United States.
gall-wasp cynipidae oak-gall heterogony missouri prairie midwest hymenoptera inquiline parasitoid-host
Callirhytis quercusoperator
Woolly Catkin Gall Wasp
Callirhytis quercusoperator is a cynipid gall wasp that induces galls on oak catkins. The species exhibits a complex life cycle with alternating generations, a common trait among Cynipidae. The galls produced by this species are characterized by a woolly or fuzzy appearance on catkins of oak trees. First described by Osten Sacken in 1862, it remains an active subject of observation with over 1,000 records on iNaturalist.
gall-wasp cynipid oak-gall heterogony catkin-gall Hymenoptera
Callirhytis quercuspunctata
Gouty Oak Gall Wasp
Callirhytis quercuspunctata, commonly known as the Gouty Oak Gall Wasp, is a cynipid gall wasp that induces gouty oak galls on oak trees. Like other members of the genus Callirhytis, this species has a complex life cycle involving alternating generations that produce distinct gall types on different oak tissues. The wasp manipulates oak growth through chemical secretions to create protective structures housing developing larvae. The species is associated with oaks (Quercus spp.) and has been documented across eastern North America.
gall-wasp cynipid oak-gall gouty-gall parthenogenesis heterogony
Callirhytis quercusventricosa
Callirhytis quercusventricosa is a species of gall wasp in the family Cynipidae, known for inducing galls on oaks (Quercus). The species exhibits the complex life cycle typical of Cynipini, with alternating sexual and asexual generations that produce distinct gall morphologies on different oak tissues. It is one of numerous oak-galling species in the large genus Callirhytis.
gall-wasp oak-gall Cynipidae heterogony North-America
Callirhytis serricornis
kernel flower gall wasp
Callirhytis serricornis is a cynipid gall wasp endemic to California that induces distinct bottle- or vase-shaped galls on oak trees. The species exhibits alternating generations with different gall phenotypes: first-generation galls are brown, while second-generation galls are red and green. It is restricted to two host oak species in the western United States.
gall-wasp Cynipidae California-endemic oak-gall heterogony Quercus-agrifolia Quercus-wislizeni
Cynipini
Oak Gall Wasps
Cynipini is the largest tribe of gall wasps in the family Cynipidae, comprising approximately 936 to 1,000 described species. Members are commonly known as oak gall wasps due to their specialized association with oaks (Quercus) and other Fagaceae. The tribe is primarily distributed in the Holarctic region, with significant diversity also in Mexico and Central America. Cynipini species induce structurally diverse galls on various oak tissues including leaves, buds, branches, petioles, catkins, acorns, and roots. Most species exhibit cyclical parthenogenesis, alternating between sexual and asexual generations that often produce different gall morphotypes on the same or different host tissues.
gall-wasps oak-gall-wasps Cynipidae Quercus parthenogenesis heterogony gall-induction ecosystem-engineers inquilines parasitoids Holarctic Mexico-biodiversity Fagaceae
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.
gall-wasp oak Cynipidae heterogony plant-insect-interaction tannins Quercus-robur Cynipini
Diplolepis nervosa
Spiked Pea Gall Wasp
Diplolepis nervosa is a gall wasp in the family Diplolepididae that induces distinctive spiked pea galls on wild roses (Rosa species). Like other members of its genus, it exhibits an alternation of generations with both sexual and parthenogenetic phases. The species is native to Europe and has been introduced to North America, where it has become established. The galls it produces are among the most recognizable of rose galls due to their characteristic spiny, pea-like appearance.
gall-wasp Cynipidae Diplolepididae Rosa rose-gall parthenogenesis heterogony introduced-species Europe North-America
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.
gall-wasp oak-gall Cynipidae heterogony ant-mutualism honeydew-secretion venom-gland plant-manipulation parasitoid-defense Quercus parthenogenesis alternation-of-generations
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-wasp cynipid heterogony parthenogenesis oak-gall California-endemic ant-mutualism Disholcaspis Cynipidae Hymenoptera Quercus induced-plant-structure phloem-sap-exudation biological-mutualism seasonal-dimorphism sexual-dimorphism gall-dimorphism agamic-generation sexual-generation clasping-twig-gall bud-gall twig-gall native-California-species scrub-oak leather-oak parasitoid-defense ant-plant-interaction insect-plant-interaction plant-manipulation evolution-of-asexuality Weld-1957 Zootaxa-4859 molecular-systematics host-plant-specificity Cynipini oak-woodland chaparral insect-gall gall-morphology gall-coloration sun-exposure-effects larval-chamber emergence-timing spring-emergence late-winter-emergence gall-development oviposition-behavior egg-laying-in-buds egg-laying-in-twigs female-only-generation wingless-female winged-sexual-generation gall-size-dimorphism gall-shape-dimorphism hidden-gall exposed-gall gall-wasp-life-cycle cynipid-biology gall-wasp-taxonomy 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Druon
Druon is a genus of cynipid gall wasps re-established in 2021, containing 15 Nearctic species that induce galls on oak trees (Quercus). Most species are known only from asexual generations, though two species (D. ignotum and D. quercuslanigerum) have documented alternating sexual and asexual generations. The genus was previously synonymized under Andricus but restored based on morphological and molecular evidence. Species are characterized by woolly galls and specific metasomal sculpturing patterns.
cynipidae gall-wasp oak-gall Nearctic heterogony Quercus
Druon ignotum
Druon ignotum is a gall wasp that induces galls on white oaks in central and eastern North America. The species exhibits a complex life cycle with alternating sexual and asexual generations, each producing morphologically distinct galls. First described as Cynips ignota in 1881, it has undergone several taxonomic revisions before its current placement in Druon.
gall-wasp oak-gall Cynipidae heterogony white-oak North-America
Druon quercuslanigerum
Druon quercuslanigerum is a cynipid gall wasp that alternates between sexual and asexual generations on live oaks. The sexual generation forms small galls on catkins in spring, while the asexual generation produces distinctive woolly galls on leaf undersides. It is one of only two species in the genus Druon with documented alternating generations.
cynipidae gall-wasp oak-gall heterogony live-oak woolly-gall alternating-generations nearctic mexico introduced-species
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.
gall-wasp oak-gall heterogony parthenogenesis California-endemic Cynipidae Feron alternation-of-generations
Melikaiella flora
Live Oak Petiole Gall Wasp
Melikaiella flora is a cynipid gall wasp that induces distinctive leaf galls on live oak trees (Quercus agrifolia, Q. wislizeni, and Q. chrysolepis) in California. The species exhibits a complex life cycle involving two generations, with second-generation females ovipositing into acorns rather than leaf tissue. The galls typically engulf the entire petiole and may extend into the leaf blade, representing one of the more dramatic gall morphologies among North American Cynipidae. Formerly classified as Callirhytis milleri, the species was reclassified to reflect improved understanding of cynipid phylogeny.
gall-wasp cynipidae oak-gall heterogony California-endemic Quercus petiole-gall bivoltine life-cycle-polymorphism acorn-gall insect-plant-interaction Hymenoptera live-oak endemic-species North-America citizen-science iNaturalist
Neuroterus
Neuroterus is a genus of gall wasps in the family Cynipidae that induce galls on oak species. The genus was first described by Theodor Hartig in 1840. Some species, notably N. saltatorius, produce distinctive 'jumping galls' that detach from the host plant and move along the ground due to larval activity within. Like other oak gall wasps, Neuroterus species exhibit complex life cycles with alternating sexual and asexual (agamic) generations, with each generation typically inducing galls on different parts of the host plant.
gall-wasp Cynipidae oak Quercus jumping-gall heterogony parasitoid-host polyphyly
Neuroterus anthracinus
Oyster Gall Wasp
Neuroterus anthracinus is a gall wasp in the family Cynipidae that forms chemically induced leaf galls on oak trees. The species exhibits heterogony, alternating between sexual and agamic (parthenogenetic) generations that produce two distinct gall types: the oyster gall and the April-bud gall. This wasp has been widely distributed across Europe and has been introduced to North America.
gall-wasp cynipid oak-gall heterogony parthenogenesis leaf-gall bud-gall introduced-species
Neuroterus niger
jumping gall wasp, black jumping gall wasp
Neuroterus niger is a species of gall wasp in the family Cynipidae that induces distinctive galls on oak leaves. This species exhibits an alternating sexual and asexual life cycle, with different generations producing different gall types. The asexual generation creates small, spherical galls that detach from leaves and fall to the ground, where the larva's movements cause the gall to jump—giving rise to the common name "jumping gall." The sexual generation produces inconspicuous leaf galls. The species has been documented across much of eastern and central North America.
Cynipidae gall-wasp oak-gall jumping-gall heterogony parthenogenesis North-America Quercus
Neuroterus saltatorius
Jumping Gall Wasp
Neuroterus saltatorius, commonly known as the jumping gall wasp, is a North American oak gall wasp in the family Cynipidae. The species is notable for producing small, round galls that detach from leaves and exhibit a distinctive jumping behavior caused by larval movements. It has a complex life cycle with alternating bisexual and parthenogenetic generations, each producing different gall types on oak hosts.
gall-wasp oak-gall jumping-gall heterogony parthenogenesis Cynipidae Neuroterus oak Quercus
Phylloteras
Phylloteras is a North American genus of gall wasps in the family Cynipidae, tribe Cynipini. These insects are specialized associates of oak trees (Quercus), inducing galls on leaves. The genus contains at least 4 described species, with estimates suggesting up to 11 species may exist. As members of the oak gall wasp tribe, they exhibit the characteristic life history of alternating generations between sexual and asexual forms, often with distinct gall morphologies for each generation.
gall-wasp oak-gall Cynipidae North-America Quercus heterogony leaf-gall