Exothecinae
Genus Guides
3Exothecinae is a of Braconidae , currently comprising approximately 24 including Colastes, Pambolus, Hormius, and Xenarcha. Members are cyclostome braconids characterized by reduced genus diversity relative to other subfamilies. The subfamily exhibits broad associations across multiple insect orders, with larvae parasitizing primarily concealed-feeding hosts such as leaf-mining and stem-boring insects.
Pronunciation
How to pronounce Exothecinae: /ˌɛk.soʊˈθɛs.ɪˌnaɪ/
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Identification
Exothecinae can be distinguished from other Braconidae by cyclostome mouthpart orientation and specific wing venation patterns. within the subfamily are differentiated by characters including capsule shape, occipital carina structure, and metasomal tergite . An illustrated key to genera and subgenera is available for identification purposes.
Distribution
Worldwide distribution with representation in all major biogeographic regions. Palaearctic fauna includes Colastes, Colastinus, and Xenarcha. Documented from Korea, Japan, China (including Taiwan), Russia (European part through Far East), Europe, Caucasus, Turkey, Iran, Kazakhstan, and Tunisia. Specific Korean records span nine provinces including Jeju Island.
Host Associations
- Diptera: Agromyzidae - larval stages
- Diptera: Anthomyiidae - Colastes pubicornis recorded from Chirosia histricina
- Lepidoptera: Coleophoridae - larval stages
- Lepidoptera: Cosmopterigidae - larval stages
- Lepidoptera: Elachistidae - larval stages
- Lepidoptera: Eriocraniidae - larval stages
- Lepidoptera: Gracillariidae - larval stages
- Lepidoptera: Heliozelidae - larval stages
- Lepidoptera: Lycaenidae - larval stages
- Lepidoptera: Lyonetiidae - larval stages
- Lepidoptera: Momphidae - larval stages
- Lepidoptera: Nepticulidae - larval stages
- Lepidoptera: Pyralidae - larval stages
- Lepidoptera: Tischeriidae - larval stages
- Lepidoptera: Tortricidae - larval stages
- Lepidoptera: Ypsolophidae - larval stages
- Coleoptera: Curculionidae - larval stages
- Hymenoptera: Tenthredinidae - larval stages
Life Cycle
Development as endoparasitoids or ectoparasitoids of larvae; specific details vary by and .
Behavior
attacking larval stages of diverse insects. Some such as Colastes braconius exhibit polyphagy across multiple host orders.
Ecological Role
agent regulating of various insect larvae including flies, , beetles, and . Specialized on concealed-feeding such as leaf miners and stem borers.
Similar Taxa
- Other Braconidae subfamiliesExothecinae distinguished by cyclostome phylogenetic affiliation and reduced diversity compared to more speciose such as Microgastrinae
More Details
Taxonomic composition
The has undergone recent taxonomic revision, with Pseudophanomeris and Shawiana synonymized with Xenarcha as subgenera. Exothecus effectus transferred to Xenarcha.
Phylogenetic position
Belongs to the cyclostome clade of Braconidae, characterized by specific mouthpart orientation and reduced morphological diversity relative to non-cyclostome lineages.