Doryctinae

Distinguished from other Braconidae by the combination of: (1) a row of stout spines running lengthwise along the foreleg tibia, (2) a cyclostome depression above the mandibles, (3) a flange on the propleuron above the forecoxa, and (4) a double node near the apex of the dorsal valve of the ovipositor. Wing reduction or loss is common but not universal. The foreleg spines are functionally associated with host escape behavior in wood-boring beetle parasitoids. Doryctinae belong to the cyclostome group of braconid subfamilies, sharing this mouthpart configuration with Alysiinae, Braconinae, Gnamptodontinae, Opiinae, and others.

Size ranges from 1 to 25 mm, spanning nearly the full size range of Braconidae. Small species have disproportionately large heads and slender, remarkably elongated bodies. Wings are frequently reduced or absent; many species are flightless or completely wingless. Diagnostic features include: a longitudinal row of stout spines on the foreleg tibia; a cyclostome depression above the mandibles; a flange on the propleuron above the forecoxa; presence of epicnemial and occipital carinae; and a double node near the apex of the dorsal valve of the ovipositor.

Associated primarily with woody substrates due to host relationships with wood-boring insects. Habitats include forests, woodlands, and areas with dead or dying wood. Some species inhabit termite colonies (Ypsistocerini: Embobraconina). Gall-forming species occur on plants. Specific habitat associations vary by tribe and genus; the subfamily as a whole occupies diverse terrestrial environments across tropical to temperate zones.

Worldwide distribution excluding polar regions. Documented from North America, South America, Europe, Asia, Africa, Australia, and the Middle East (including United Arab Emirates and Yemen). The subfamily is especially diverse in tropical regions, where taxonomic knowledge remains highly incomplete. Mexico has been reported as having the highest number of recorded genera for the subfamily. Fossil representatives known from late Eocene Baltic amber.

• wood-boring beetles - idiobiont ectoparasitoidPrimary hosts; larvae of Buprestidae (jewel beetles) and other wood-boring beetles. Host paralyzed by venom before egg laying.
• Lepidoptera - parasitoidSome species parasitize wood-boring lepidopteran larvae
• Symphyta - parasitoidSome species parasitize sawfly larvae
• Embiidinae - parasitoidRecorded for some species
• termites - termitophily/associationConfirmed for genera in tribe Ypsistocerini, subtribe Embobraconina (Embobracon, Preembobracon); biology of Preembobracon explicitly unknown
• fig wasps - inquilinismMembers of genus Psenobolus thought to be inquilines of fig wasps

Adult females use the stout spines on the foreleg tibia to escape from narrow wooden tunnels after parasitizing hosts. Hosts are paralyzed by venom injected through the ovipositor before egg deposition. Most species are idiobiont ectoparasitoids, meaning they paralyze the host and develop externally on it. Some species are gall-formers on plants. Some species in genus Allorhogas feed on seeds.

Important parasitoids of wood-boring insects, contributing to regulation of beetle populations in forest and woodland ecosystems. Some species function as biocontrol agents against pest insects. Gall-forming species interact with plant tissues. Inquiline species associate with fig wasp communities.

Several species are economically important as biological control agents. In Australia, doryctine wasps are used against eucalyptus pests. Spathius agrili was introduced from China to the United States to control the emerald ash borer (Agrilus planipennis). Doryctines have been deployed for pest control in Europe, Australia, and North America. The subfamily remains poorly studied taxonomically, with numerous new species described annually.

• MesostoinaeSome Doryctinae form galls similar to those of Mesostoinae; however, Mesostoinae is endemic to Australia and distinguished by separate tribal and generic classification
• other cyclostome BraconidaeShares cyclostome mouthpart configuration with Alysiinae, Braconinae, Gnamptodontinae, Opiinae, Rogadinae, and others; distinguished by the combination of foreleg tibial spines, ovipositor features, and propleural flange
• Ypsistocerinae (now Ypsistocerini)Formerly separate subfamily, now subsumed within Doryctinae as tribe Ypsistocerini; historically considered potentially closest relative within the cyclostome group

• parasitoid
• biocontrol
• wood-boring insects
• cyclostome
• wing reduction
• gall-former
• inquiline
• diverse
• poorly known

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Seis nuevas especies del género de avispas parasitoides Notiospathius (Hymenoptera: Braconidae: Doryctinae) de México Six new species of the parasitoid wasp genus Notiospathius (Hymenoptera: Braconidae: Doryctinae) from Mexico
• Figure 3 from: Gutiérrez-Arellano D, Gutiérrez-Arellano C, Zaldívar-Riverón A (2015) DNA Barcoding of the parasitoid wasp subfamily Doryctinae (Hymenoptera: Braconidae) from Chamela, Mexico. Biodiversity Data Journal 3: e5109. https://doi.org/10.3897/BDJ.3.e5109
• Preembobracon gen. nov. (Hymenoptera: Braconidae: Doryctinae: Ypsistocerini: Embobraconina) from Brazil
• A new genus and species of apterous Doryctinae (Hymenoptera: Braconidae) from Costa Rica
• Review of the braconid parasitoid subfamily Doryctinae (Hymenoptera, Braconidae) from the United Arab Emirates and Yemen
• Doryctinae (Hymenoptera, Braconidae) from Baltic amber: description of a new genus and species
• The ectoparasitoid wasp Heterospilussicanus (Marshall, 1888) (Hymenoptera, Braconidae, Doryctinae) as a natural enemy of Gastralluspubens Fairmaire, 1875 (Coleoptera, Ptinidae) in Italy.