Redback-spider
Guides
Agenioideus
spider wasps
Agenioideus is a genus of spider wasps in the family Pompilidae, subfamily Pompilinae. The genus contains approximately 30 described species distributed across Europe, Asia, North America, South America, and Australia. Species are generally small, with females of A. humilis measuring 5.5–10.5 mm and males 4–9.5 mm. The genus gained notable attention when A. nigricornis was documented as the first pompilid wasp known to parasitize the highly venomous redback spider (Latrodectus hasselti) in Australia.