Bethylidae
Guides
Anisepyris
Anisepyris is a genus of flat wasps in the family Bethylidae, subfamily Epyrinae. The genus contains 13 recognized species-groups and is primarily distributed in the Neotropical region with limited representation in the Nearctic. A recent phylogenetic analysis based on 120 morphological characters across 72 operational taxonomic units resolved well-supported relationships among species and identified key synapomorphies. The genus is hypothesized to have a relatively recent origin, with historical dispersal patterns linked to dense forest habitats.
Anisepyris williamsi
Anisepyris williamsi is a species of wasp in the family Bethylidae, described by Evans in 1959. The genus Anisepyris comprises small, typically non-stinging parasitoid wasps that attack the larvae or pupae of various insects. This species has been recorded from multiple countries in the Americas, including the United States (California), Mexico, and several South American nations. Like other bethylids, it likely plays a role in natural biological control of pest insects, though specific biological details for this species remain poorly documented.
Bethylinae
Bethylinae is a subfamily of small, stout-bodied parasitoid wasps within the family Bethylidae. Members are characterized by reduced wing venation and a compact, often humpbacked appearance. The subfamily contains numerous species that parasitize the larvae of beetles and moths, with females typically searching for concealed hosts in plant material or soil. Bethylinae is distinguished from other bethylid subfamilies by specific morphological features of the antennae and mesosoma.
Bethylus amoenus
Bethylus amoenus is a species of wasp in the family Bethylidae, a group of parasitoid wasps commonly known as flat wasps. The genus Bethylus is part of the chrysidoid wasp lineage within Hymenoptera. Species in this genus are typically small, compact wasps with reduced wing venation and are known to parasitize the larvae of various insects, particularly beetles. The specific epithet "amoenus" (Latin for "pleasant" or "delightful") suggests this species may have been named for its attractive appearance, though this interpretation is speculative without access to the original description. Very few observations of this species exist in public databases.
Cephalonomia
Cephalonomia is a genus of parasitoid wasps in the family Bethylidae, containing over 20 described species. Species within this genus are primarily known as biological control agents targeting beetle pests in stored grain and agricultural systems. C. stephanoderis is extensively used against the coffee berry borer (Hypothenemus hampei) in coffee-producing regions, while C. waterstoni and C. tarsalis target stored product beetles such as Laemophloeus ferrugineus and Oryzaephilus surinamensis. These wasps exhibit idiobiont parasitoid biology, with females attacking host larvae or pupae.
Dissomphalus
Dissomphalus is the most species-rich genus in the family Bethylidae (Hymenoptera), with over 600 valid species globally. The genus exhibits exceptional diversity in the Neotropical region, where the majority of species occur, though it has a cosmopolitan distribution including the Oriental region and southwestern Pacific islands. Species delimitation relies heavily on male genitalia characters and metasomal tergal process structures, with species-groups defined primarily by these morphological features. Taxonomic revisions have revealed high levels of undescribed diversity, particularly in underexplored regions such as Panama, Thailand, and the Fiji-Solomon Islands archipelago.
Dracunesia
Dracunesia is a genus of small parasitoid wasps in the family Bethylidae, described in 2018 by Alencar and Azevedo. The genus was established based on specimens from Brazil, representing a distinct lineage within this family of aculeate wasps. Bethylidae are known as flat wasps, characterized by their laterally compressed bodies and parasitoid lifestyle, primarily attacking immature stages of various insects. As a recently described genus, knowledge of Dracunesia remains limited to the original taxonomic description.
Goniozus asperulus
Goniozus asperulus is a species of parasitoid wasp in the family Bethylidae. Members of this genus are known to parasitize larvae of Lepidoptera, particularly pyralid moths that are agricultural pests. The species is characterized by specific morphological features including surface sculpturing on the mesosoma. It has been recorded in association with stored product pest scenarios.
Goniozus columbianus
Goniozus columbianus is a species of parasitic wasp in the family Bethylidae. Like other members of this family, it is presumed to be an ectoparasitoid of insect larvae, though specific host records for this species are not well documented. The genus Goniozus contains species that are known to attack lepidopteran caterpillars. This species has been recorded from at least one observation.
Goniozus legneri
Goniozus legneri is a gregarious larval ectoparasitoid wasp in the family Bethylidae, native to Argentina. It parasitizes concealed-feeding lepidopteran larvae and has been evaluated as a biological control agent for multiple agricultural pests including the European grapevine moth (Lobesia botrana), carob moth (Ectomyelois ceratoniae), codling moth (Cydia pomonella), tomato leafminer (Tuta absoluta), and cactus moth (Cactoblastis cactorum). The species exhibits parental care behavior, with females guarding their brood for approximately four days. While it has shown promise in augmentative biological control programs, its effectiveness varies considerably depending on host species and rearing conditions.
Pristocera
Pristocera is a genus of chrysidoid wasps in the family Bethylidae, distributed across the Old World. Males are distinguished by a hypopygium split into two separate plates, while females possess petiolar flaps. The genus comprises numerous species, with documented diversity in Africa, Asia, and Papua New Guinea. At least one species, Pristocera rufa, is known to be a gregarious ectoparasitoid of weevil larvae.
Pseudisobrachium
flat wasps
Pseudisobrachium is a genus of chrysidoid wasps in the family Bethylidae, commonly known as flat wasps. The genus was erected by Kieffer in 1904 and has undergone substantial taxonomic expansion, particularly from the Brazilian Amazon region where 33 new species were described in a 2024 monograph. The genus now contains approximately 40+ species, with most diversity concentrated in Neotropical regions.
Pseudisobrachium carbonarium
Pseudisobrachium carbonarium is a species of parasitoid wasp in the family Bethylidae, first described by William Harris Ashmead in 1893. Members of this genus are small, dark-colored wasps that parasitize beetle larvae, particularly those of wood-boring and stored-product beetles. The species is part of a taxonomically complex group where species boundaries are often difficult to establish due to morphological similarity.
Rysepyris
Rysepyris is a genus of small parasitoid wasps in the family Bethylidae, first described by Kieffer in 1906. Members of this genus are poorly known, with very few observations and limited taxonomic study. Bethylid wasps are generally ectoparasitoids of insect larvae, particularly beetles and moths.
Rysepyris micidus
Rysepyris micidus is a species of wasp in the family Bethylidae, a group of small parasitoid wasps. Members of this genus are known to parasitize larvae of beetles and other insects. The species is characterized by its compact body form typical of bethylids. Specific biological details for this species remain poorly documented in published literature.
Scleroderminae
Scleroderminae is a subfamily of small parasitoid wasps within the family Bethylidae. Members of this subfamily are characterized by their compact body form and reduced wing venation compared to other bethylids. They are primarily known as parasitoids of beetle larvae, particularly those in wood-boring and stem-boring families. The subfamily includes genera such as Sclerodermus, which has been studied for its potential in biological control.
Sclerodermus
Flat wasp
Sclerodermus is a genus of small parasitoid wasps in the family Bethylidae, comprising at least 20 described species. These wasps exhibit quasi-social behavior rare among parasitoids: multiple females cooperate to paralyze hosts and provision shared broods with extended maternal care. Most individuals are wingless, leading to frequent misidentification as ants. The genus is notable for extremely female-biased sex ratios (often 86-97% female) and has significant value as biological control agents against wood-boring beetles, particularly in forestry systems.
Sclerodermus carolinensis
Sclerodermus carolinensis is a small parasitoid wasp in the family Bethylidae, native to the southeastern United States. Adults are typically 1.5–6 mm in length and often wingless, making them easily mistaken for ants. The species parasitizes wood-boring beetles and occasionally co-infests homes where such beetles are present. Females are long-lived (up to seven months) and greatly outnumber males, which are short-lived (about one week).