Egg-retention
Guides
Chetogena
Chetogena is a genus of tachinid flies (Diptera: Tachinidae) comprising parasitoid species. Members are solitary parasitoids that attack various Lepidoptera hosts. Some species exhibit specialized reproductive behaviors, including egg retention in response to host deprivation. The genus has been studied for biological control potential against agricultural pests.
Tryphonini
Tryphonini is a tribe of koinobiont ichneumonid wasps within the subfamily Tryphoninae. Members are ectoparasitoids of sawfly larvae (Hymenoptera: Symphyta), with females possessing relatively large egg loads compared to idiobiont relatives. The genus Polyblastus is a well-documented member of this tribe. Females have been observed carrying egg clusters externally, possibly due to egg retention after unsuccessful oviposition attempts.