Parasitoid
Guides
Hyptia harpyoides
Hyptia harpyoides is a species of ensign wasp in the family Evaniidae, first described by Bradley in 1908. This small parasitoid wasp is known from North America, with records from Canada including Ontario. It has been documented as a parasite of Parcoblatta cockroach eggs. The species belongs to a group of wasps characterized by their distinctive abdominal morphology and cockroach egg parasitism.
Hyptia reticulata
Hyptia reticulata is a species of ensign wasp in the family Evaniidae, first described by Thomas Say in 1837. Members of this family are characterized by their distinctive abdominal morphology and are commonly known as ensign wasps due to the flag-like appearance of their laterally compressed, stalked abdomens. The genus Hyptia is one of several genera within Evaniidae, a group of parasitoid wasps whose larvae develop within the oothecae of cockroaches. This species is known from North America and Middle America based on distributional records.
Hystricia
Hystricia is a genus of tachinid flies established by Macquart in 1844, containing approximately 23 described species distributed primarily in the Americas. These flies are characterized by large body size and spiny abdominal tergites, a trait common to many Tachinidae. Like other members of their family, they are parasitoids of other insects. The genus has been subject to taxonomic revision, with species described by multiple authors including Curran, Wulp, and Rondani.
Hystricia abrupta
Spiny-butt fly
Hystricia abrupta is a species of bristle fly in the family Tachinidae, commonly recognized by its spiny abdomen. This large tachinid fly is frequently found in western North America, where adults visit late summer and fall wildflowers for nectar. Like other tachinid flies, it is a parasitoid, with larvae developing inside host insects. It is often mistaken for similar large tachinids such as Adejeania vexatrix and Paradejeania rutilioides due to its robust, spiny appearance.
Ibalia
Ibalia is a genus of parasitoid wasps in the family Ibaliidae, comprising approximately 13-14 described species. All species are specialized parasitoids of siricid woodwasps (family Siricidae), attacking the larval stages of their hosts within dead or decaying wood. Females locate host larvae by detecting volatile compounds emitted by symbiotic fungi that siricids cultivate for nutrition. The genus is notable for its laterally compressed abdomen, giving a distinctive flattened appearance, and for its role as a biological control agent against invasive woodwasps such as Sirex noctilio.
parasitoidwoodwasp-parasitoidbiological-controlforest-insectCynipoideaproovigenicolfactory-foragingcuticular-hydrocarbonesalkane-pheromonesSiricidae-parasitoidAmylostereumCerrenavolatileshost-finding-behaviorpatch-foragingcon-specific-interferenceflight-capacitylaterally-compressed-abdomenIbalia-ancepsIbalia-leucospoidesIbalia-drewseniIbalia-japonicaIbalia-rufipesIbalia-ruficollisIbalia anceps
Ibalia anceps is a parasitoid wasp in the family Ibaliidae, widely distributed across North America. Adults are active primarily in late May and early June. The species is a specialized parasite of horntail woodwasps in the family Siricidae, most commonly Tremex columba. Females locate host larvae tunneling in dead or weakened deciduous hardwoods and lay eggs on or near the host. The resulting larva initially feeds internally, then exits to complete development as an external parasite.
Ibalia leucospoides
knife-shaped ibalia, Sirex Ibaliid Wasp
Ibalia leucospoides is a solitary endoparasitoid wasp in the family Ibaliidae, native to the Northern Hemisphere and widely introduced to the Southern Hemisphere as a biological control agent for the invasive woodwasp Sirex noctilio. Adults are active from April to December depending on location, with a univoltine life cycle synchronized with host emergence. The species exhibits pro-ovigenic reproduction, with females emerging with a high proportion of mature eggs relative to lifetime fecundity. Adult feeding has minimal impact on egg maturation, survival, or flight capacity.
Ibaliidae
ibaliid wasps
The Ibaliidae are a small family of parasitoid wasps in the superfamily Cynipoidea, comprising three extant genera (Ibalia, Heteribalia, and Eileenella) with approximately 20 species worldwide. Unlike most cynipoids, which are phytophagous gall-formers, ibaliids are parasitoids of wood-boring sawfly larvae in the family Siricidae. Adults are notably large for cynipoids, reaching up to 30 mm in length, with a distinctive laterally compressed abdomen. The family is sister to the rest of Cynipoidea excluding the small subfamily Austrocynipidae.
Icelia
Icelia is a genus of tachinid flies established by Robineau-Desvoidy in 1830. The genus comprises five described species distributed across the Americas. Members of this genus are parasitoid flies, placing them within the diverse guild of Tachinidae that serve as biological control agents. The genus is the type genus of the tribe Iceliini within the subfamily Tachininae.
Iceliini
Iceliini is a tribe of tachinid flies comprising three genera: Erviopsis, Icelia, and Iceliopsis. These flies are parasitoids, with larvae developing inside other insects. The tribe is placed in the subfamily Tachininae and is distinguished by specific morphological features of the male terminalia.
Ichneumon
Ichneumon wasps
Ichneumon is a genus of parasitic wasps in the family Ichneumonidae, one of the largest and most diverse groups of parasitoid insects. Members of this genus exhibit typical ichneumonid morphology with elongated bodies, long antennae, and often prominent ovipositors. The genus name derives from Greek "ichneumon" meaning "tracker," reflecting their host-finding behavior. Like other ichneumonids, they are parasitoids of other insects, with larvae developing on or within host organisms.
Ichneumon ambulatorius
Ichneumon ambulatorius is a species of ichneumon wasp in the family Ichneumonidae, described by Fabricius in 1775. As with most ichneumon wasps, it is a parasitoid, though specific host records for this species are not well documented in the available literature. The species has been recorded in western Canada, specifically from Alberta and Manitoba.
Ichneumon clasma
Ichneumon clasma is a species of parasitoid wasp in the family Ichneumonidae, described by Carlson in 1979. The genus Ichneumon is one of the largest genera within the family, containing numerous species that parasitize other insects. Like other ichneumon wasps, this species likely has a life history involving parasitism of host insects, though specific biological details remain poorly documented. The species is recognized in taxonomic databases but appears to be rarely encountered or reported in field observations.
Ichneumon devinctor
Ichneumon devinctor is a species of ichneumon wasp in the family Ichneumonidae, first described by Thomas Say in 1825. It belongs to the large and diverse genus Ichneumon, which contains hundreds of species across North America and beyond. Like other ichneumon wasps, it is a parasitoid, with larvae developing on or within host insects. Specific biological details for this species remain poorly documented in available literature.
Ichneumon feriens
Ichneumon laetus
Ichneumon laetus is a species of ichneumon wasp in the family Ichneumonidae, described by Brullé in 1846. The species has been recorded from several locations in Canada including Alberta, Manitoba, and Saskatchewan. Like other members of the genus Ichneumon, this species is presumed to be a parasitoid wasp, though specific host relationships remain undocumented. The genus Ichneumon is one of the largest genera within Ichneumonidae, containing numerous species with varied ecological associations.
Ichneumon subdolus
Ichneumon subdolus is a species of ichneumon wasp in the family Ichneumonidae, first described by Cresson in 1867. Like other members of the genus Ichneumon, it is a parasitoid wasp. The species has been recorded from limited localities in North America, including Calgary, Canada and Vermont, USA. Specific details about its biology, hosts, and appearance remain poorly documented in available literature.
Ichneumonidae
Ichneumonid wasps, Darwin wasps, Ichneumon wasps
Ichneumonidae is a family of parasitoid wasps within Hymenoptera, representing one of the most diverse insect families with approximately 25,000 described species and estimates of 60,000–100,000+ total species worldwide. Members are exclusively parasitoids, attacking immature stages of holometabolous insects and spiders, with larvae consuming living hosts before emergence. The family plays significant regulatory roles in insect populations across natural and agricultural ecosystems.
Ichneumoninae
Ichneumoninae is the second largest subfamily of Ichneumonidae, with over 420 genera and 4,375 described species distributed worldwide. Members are typically large, conspicuous, and often brightly colored parasitoid wasps. They are koinobiont or idiobiont endoparasitoids of Lepidoptera, with larvae developing inside moth and butterfly caterpillars or pupae. The subfamily was recently reorganized from 15 tribes to 7 tribes, with Ichneumonini containing well over 300 genera.
Ichneumonini
Ichneumonini is a large and diverse tribe of ichneumon wasps within the family Ichneumonidae, containing more than 350 genera and thousands of described species. Members are parasitoid wasps, with genera such as *Anisobas* documented across the Holarctic and Indo-Malaysian regions. The tribe is particularly well-represented in the Nearctic region, with multiple species known from western North America.
Ichneumonoidea
Ichneumonid and Braconid Wasps
Ichneumonoidea is a superfamily of Hymenoptera containing two extant families: Ichneumonidae and Braconidae, the two largest families within the order. The group encompasses an estimated 100,000 species, the vast majority undescribed. Members are solitary parasitoid wasps whose larvae develop on or inside host insects, eventually killing them. The superfamily is defined morphologically by fusion of the costal and radial veins of the fore wing and typically more than 11 antennal segments.
Ichneutes
Ichneutes is a genus of parasitoid wasps in the family Braconidae, established by Christian Gottfried Daniel Nees von Esenbeck in 1814. The genus belongs to the large and diverse ichneumonoid wasp superfamily, which contains thousands of species that parasitize other insects. Very few observations of Ichneutes have been recorded, with only 4 documented on iNaturalist. The genus has been reported from parts of northern Europe including Denmark, Norway, and Sweden.
Idarnes
Idarnes is a genus of chalcid wasps in the family Agaonidae (fig wasps), first described by Walker in 1843. These wasps are associated with fig trees (Ficus), where they develop as inquilines or parasitoids within fig syconia. The genus is part of the subfamily Sycophaginae, a group of non-pollinating fig wasps that exploit fig resources without providing pollination services. Idarnes species are found primarily in the Neotropics.
Idiogrammatini
Idiogrammatini is a small tribe of parasitoid wasps in the family Ichneumonidae. The tribe contains few described species and is rarely encountered in field collections. Members are characterized by distinctive morphological features of the ovipositor and associated structures. The group has received limited taxonomic study compared to larger ichneumonid tribes.
Idris
Idris is a large genus of parasitic wasps in the family Scelionidae, first described by Förster in 1856. The genus contains over 300 described species worldwide, with many more remaining undescribed. Most species are egg parasitoids, historically associated with spider eggs, though at least one species has been documented parasitizing stink bug eggs. Members are typically very small, measuring 1–2 mm in length, with reduced wing size that facilitates access to concealed host eggs.
Imitomyia sugens
Imitomyia sugens is a tachinid fly first described by Hermann Loew in 1863. It belongs to the tribe Imitomyiini within the subfamily Dexiinae. The species is known from North America, with records from Canada and the United States. Like other tachinid flies, it is likely a parasitoid, though specific host associations remain undocumented.
Inostemma
Inostemma is a genus of minute parasitoid wasps in the family Platygastridae, established by Haliday in 1833. Species within this genus are known to parasitize gall midges (Diptera: Cecidomyiidae) across diverse habitats including pine forests, agricultural crops, and tropical vegetation. Several species have been documented as biological control agents of pestiferous gall midges, with well-studied examples including parasitoids of the invasive pine needle gall midge in eastern Asia. The genus exhibits cosmopolitan distribution with particular diversity in the Palearctic, Asia, and Madagascar.
Iphitrachelus
Iphitrachelus is a genus of minute parasitoid wasps in the family Platygastridae, first described by Haliday in 1836. The genus has an almost cosmopolitan distribution with records from North America, Africa, and Europe. As platygastrids, members are presumed to be egg parasitoids of insects, though specific host associations remain largely undocumented. The Nearctic fauna includes three species, with I. canadensis described from Ontario, Quebec, and Newfoundland.
Ischnus inquisitorius
Ischnus inquisitorius is a small ichneumonid wasp of the subfamily Cryptinae, approximately 7 mm in length, with distinctive sexually dimorphic coloration. The species was formerly known as I. migrator due to a misidentification of Fabricius's types, but the valid name was re-established by Horstmann in 2001. It is a widespread parasitoid of tortricid moth pupae across the Holarctic region.
Ischnus inquisitorius atricollaris
Ischnus inquisitorius atricollaris is a subspecies of ichneumon wasp in the family Ichneumonidae. It was first described by Walsh in 1873. The subspecies is distinguished from the nominate form by its dark collar marking. It belongs to a genus of parasitoid wasps whose members attack wood-boring beetle larvae.
Ischnus sparsus
Ischnus sparsus is a species of ichneumon wasp described by Townes in 1962. It belongs to the genus Ischnus within the family Ichneumonidae, one of the largest families of parasitoid wasps. The species is poorly documented in public sources, with minimal observational records available.
Iseropus
Iseropus is a genus of ichneumon wasps comprising approximately nine described species. Members are ectoparasitoids of lepidopteran hosts, with documented associations including pupal parasitism of noctuid moths and larval parasitism of pyralid moths. The genus exhibits a broad distribution across multiple continents, with species described from the Americas, Europe, and Asia. Some species have been studied for their venom-mediated manipulation of host lipid metabolism.
Iseropus coelebs
Iseropus coelebs is a species of ichneumon wasp in the family Ichneumonidae, described by Walsh in 1873. As a member of the genus Iseropus, it belongs to a group of parasitoid wasps whose larvae develop inside other insects. The species is native to North America and exhibits the slender body form and elongated antennae characteristic of ichneumonids.
Iseropus stercorator
Iseropus stercorator is a species of ichneumon wasp in the family Ichneumonidae. The species was described by Fabricius in 1793 based on the basionym Ichneumon stercorator. It belongs to the genus Iseropus, which contains parasitoid wasps. Records indicate presence in the Canadian prairie provinces, particularly Alberta and Saskatchewan.
Istocheta
Istocheta is a genus of tachinid flies (Diptera: Tachinidae) in the tribe Blondeliini. The genus contains approximately 30 described species distributed across the Palearctic and Nearctic regions. Istocheta aldrichi, the most extensively studied species, is a specialist parasitoid of the Japanese beetle (Popillia japonica) and has been widely introduced as a biological control agent. Most species in the genus appear to be parasitoids of scarab beetles, though detailed host records remain limited for many taxa.
Istocheta aldrichi
Winsome Fly
Istocheta aldrichi is a tachinid fly native to Japan that was introduced to North America in 1922 as a biological control agent against the invasive Japanese beetle (Popillia japonica). The species has established throughout northeastern North America and has recently expanded its range into Quebec, Ontario, and the Midwest United States. It is a highly host-specific parasitoid that deposits large white macrotype eggs on the pronotum of adult Japanese beetles, with larvae developing internally and causing host death within 5–7 days of egg hatch. Recent studies demonstrate parasitism rates of 15–60% in some areas, making it an important natural enemy for integrated pest management.
Itoplectis
Itoplectis is a genus of parasitoid wasps in the family Ichneumonidae, first described by Arnold Förster in 1869. The genus contains approximately 35 to 61 recognized species with cosmopolitan distribution. Members are polyphagous solitary parasitoids that attack lepidopteran pupae and have been studied extensively for their potential as biological control agents. Several species, particularly I. conquisitor and I. naranyae, serve as model organisms for research on parasitoid behavior, learning, and chemical ecology.
Itoplectis viduata
Itoplectis viduata is a parasitoid wasp in the family Ichneumonidae, subfamily Pimplinae. The species has been documented as a pseudohyperparasitoid, utilizing cocoons of the spider wasp Homonotus sanguinolentus (Pompilidae) as hosts. Rearing records from the National Museums of Scotland indicate a broader host range beyond this single association. The species occurs across parts of Europe and has been recorded in western Canada.
Ixodes affinis
Ixodes affinis is a hard-bodied tick species distributed across the southeastern United States, Mexico, Central America, and South America. Unlike its congener Ixodes scapularis, this species does not bite humans but serves as a competent vector for Borrelia burgdorferi sensu stricto, the causative agent of Lyme disease. Immature stages feed on birds and small mammals, while adults parasitize larger mammals including deer and dogs. Its expanding range into southeastern Virginia and association with migratory birds has raised concerns about its role in pathogen dispersal.
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Ixodiphagus is a genus of minute chalcidoid wasps in the family Encyrtidae, comprising approximately 10–11 described species worldwide. These wasps are obligate parasitoids of ticks (order Ixodida), with females ovipositing into larval or nymphal tick hosts. The genus was erected by Leland Ossian Howard in 1907, with I. texanus as the type species. Ixodiphagus has been extensively studied as a potential biological control agent for medically and veterinary important tick species due to its unique host-specific biology.
Ixodiphagus hookeri
tick wasp
Ixodiphagus hookeri, commonly known as the tick wasp, is a minute parasitoid wasp in the family Encyrtidae that specializes in attacking hard ticks (Ixodidae). Females oviposit eggs into unfed tick nymphs, with development proceeding only after the host engorges on vertebrate blood. The wasp harbors the symbiotic bacterium Wolbachia pipientis, which appears to suppress the tick's immune response and facilitate successful parasitism. This species has been recorded from numerous tick genera worldwide and is considered a promising candidate for biological control of tick vectors of human and animal disease.
Jaliscoa
Jaliscoa is a genus of chalcidoid wasps in the family Pteromalidae, established by Bouček in 1993. The genus was redefined in a 2013 taxonomic revision and currently includes four species: J. nudipennis (type species), J. bouceki, J. hunteri, and J. vulgaris. The most extensively studied species, J. hunteri, is a parasitoid of weevils in the genus Anthonomus, particularly the pepper weevil (A. eugenii), and has been investigated as a biological control agent. Unlike many parasitoids, J. hunteri exhibits significant host feeding behavior that contributes to pest suppression.
Jaliscoa hunteri
Jaliscoa hunteri is a pteromalid parasitoid wasp native to North America that functions as a biological control agent of weevil pests in agricultural systems. Originally described as Catolaccus hunteri in 1908, it was transferred to Jaliscoa in a 2013 revision. The species is best known for parasitizing and host-feeding on pepper weevil (Anthonomus eugenii) larvae in pepper crops, and has been evaluated for control of hibiscus bud weevil (Anthonomus testaceosquamosus). Laboratory studies demonstrate strong attraction to volatiles emitted by weevil-infested pepper plants and fruit.
Jurinella
Jurinella is a genus of tachinid flies in the tribe Tachinini. The genus contains approximately 50 described species distributed primarily in the Neotropical region. Species were described by multiple dipterists including Townsend, Curran, and Blanchard between the mid-19th and mid-20th centuries. As with other tachinids, members of this genus are presumably parasitoids, though specific host associations remain largely undocumented.
Juriniopsis adusta
Juriniopsis adusta is a species of tachinid bristle fly found across North America. It is a common and widespread member of the family Tachinidae, frequently observed visiting flowers of Ericameria nauseosa (rubber rabbitbrush) in the western United States. The species is one of the most frequently encountered tachinids in this habitat, often appearing in large numbers during late summer and early fall. Its broad distribution spans from southern Canada through the United States and into Mexico, Central America, and northern South America.
Juriniopsis aurifrons
Juriniopsis aurifrons is a species of bristle fly in the family Tachinidae, first described by Brooks in 1949. The species is known from the southwestern United States and Mexico. Like other tachinid flies, it is likely a parasitoid, though specific host records remain undocumented. Adults have been observed visiting flowers, particularly those of rubber rabbitbrush (Ericameria nauseosa).
Kapala
Kapala is a genus of parasitoid wasps in the family Eucharitidae, established by Cameron in 1884. The genus is the most common and widely distributed eucharitine genus in the Neotropics, associated with poneromorph ants as hosts. Eucharitid wasps are highly specialized parasitoids whose larvae develop inside ant colonies.
Kirbya
Kirbya is a genus of tachinid flies (family Tachinidae) established by Robineau-Desvoidy in 1830. The genus contains at least nine recognized species distributed across four subgenera, with records from North America, Europe, and Central Asia. As members of the tribe Voriini, these flies are parasitoids, though specific host associations remain poorly documented for most species.
Kirbya setosa
Kirbya setosa is a tachinid fly species described by Townsend in 1915. Tachinidae are parasitoid flies whose larvae develop within or on other insects, though the specific hosts of K. setosa remain undocumented. The species is recorded from the United States and Mexico. Beyond its taxonomic placement and geographic distribution, published information on this species is extremely limited.
Kleidotoma
Kleidotoma is a genus of small parasitoid wasps in the family Figitidae. Members are hyperparasitoids, developing on the larvae of other parasitoid wasps that attack gall-forming insects. The genus occurs primarily in the Holarctic region, with records from northern Europe.