Host associations of Brazilian Darwin wasps: current knowledge and the IchHostBR dataset

Abstract

Darwin wasps (Hymenoptera: Ichneumonidae) are among the most diverse and ecologically important groups of parasitoid insects, with more than 25,000 valid species and many more yet to be discovered. As the most speciose family within the order Hymenoptera, their remarkable evolutionary success is primarily attributed to their parasitic life history, which enables them to exploit a vast array of hosts and ecological niches. Despite their pivotal role in regulating host populations and maintaining ecosystem balance, host association data for Ichneumonidae remain significantly underexplored. This article presents IchHostBR, a comprehensive dataset compiling host-parasitoid records for Brazilian Darwin wasps. The dataset integrates 342 host-parasitoid associations sourced from 156 journal articles, encompassing 16 subfamilies, 74 genera, and 93 species of Ichneumonidae, as well as six host orders and 121 host species. The methodology involved rigorous data collection, cleaning, and standardization ensuring accuracy and usability. The primary aim of this initiative is to establish a robust, accessible, and continuously updated online platform that supports research and conservation efforts. In addition to introducing the dataset, the article provides a state-of-the-art review of current knowledge on Ichneumonid host associations, identifies key gaps in our knowledge and hopefully lays a foundation for advancing studies on Ichneumonidae host interactions in Brazil.