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Megastigmus transvaalensis (Hussey)

(Life: Kingdom: Metazoa (animals); Phylum: Arthropoda; Class: Hexapoda; Order: Hymenoptera;  Superfamily: Chalcidoidea; Family: Megastigmidae; Genus: Megastigmus)

Eumegastigmus transvaalensis Hussey, 1956. Holotype in the Natural History Museum, London (NHML). Type locality: Pretoria, South Africa.

Eumegastigmus rhusi Hussey, 1956. Holotype in the Natural History Museum, London (NHML). Type locality: Bloemfontein, South Africa. (Synonymy by Grissell & Prinsloo, 2001)


Female

 


Male

Photographs Alain Roques (INRA, France).

Distribution

Afrotropical region: Kenya, Mauritius, Reunion, South Africa, Zimbabwe. Introduced to: Argentina, Brazil, Canary islands, California, Hawaii, Mauritius, Reunion. Introduced to California with its native host plant Searsia lancea and subsequently switched to introduced Schinus species.

Nearctic region: Mexico, USA (California, Florida, Hawaii); Neotropical region: Argentina, Brazil; and Palaearctic region: France, Israel, Morocco, Portugal, Spain (Canary Islands).

Biology

Gall-former in seed capsules of Searsia (=Rhus) species (Anacardiaceae), host shift to Schinus molle and Schinus terebinthifolia (Anacardiaceae). Reared from Searsia natalensis (depicted above) and S. vulgaris in Kenya. Photograph Robert Copeland (ICIPE, Kenya).

References

Bouček, Z. 1978. A study of the non-podagrionine Torymidae with enlarged hind femora, with a key to the African genera (Hymenoptera). Journal of the Entomological Society of Southern Africa 41: 91-134.

Grissell, E.E & K.R. Hobbs. 2000. Megastigmus transvaalensis (Hussey) (Hymenoptera: Torymidae) in California: Methods of introduction and evidence of host switching, pp.265-278. In The Hymenoptera: Evolution, biodiversity and biological control. CSIRO Publishing, Melbourne, Australia.

Grissell, E.E. & Prinsloo, G.L. 2001. Seed-feeding species of Megastigmus (Hymenoptera: Torymidae) associated with Anacardiaceae. Journal of Hymenoptera Research, 10, 271-279.

Habeck, D.H., F.D. Bennett, & E.E. Grissell. 1989. First record of a phytophagous seed chalcid from Brazilian peppertree in Florida. Florida Entomologist 72: 378-379.

Hussey, N. W. 1956. A new genus of African Megastigminae (Hymenoptera: Chalcidoidea). Proceedings of the Royal Entomological Society London (B) 25: 157-162.

Roques A, Copeland RS, Soldati L, Denux O, Auger-Rozenberg M-A 2016. Megastigmus seed chalcids (Hymenoptera, Torymidae) radiated much more on Angiosperms than previously considered. I- Description of 8 new species from Kenya, with a key to the females of Eastern and Southern Africa. ZooKeys 585: 51124. doi: 10.3897/zookeys.585.7503

Scheffer, S. & Grissell, E.E. 2003. Tracing the geographic origin of Megastigmus transvaalensis (Hymenoptera: Torymidae): an African wasp feeding on a South American plant in North America. Molecular Ecology 12: 415421.

Wheeler, G.S., L.M. Massey & M. Endries. 2001. The Brazilian peppertree drupe feeder Megastigmus transvaalensis (Hymenoptera: Torymidae): Florida distribution and impact. Biological Control 22: 139-148.

Credits

Photographs Alain Roques (INRA, France) or Robert Copeland (ICIPE, Kenya). Map illustration Simon van Noort (Iziko Museums of South Africa).


Web author Simon van Noort (Iziko South African Museum)

 

Citation: van Noort, S. 2021. WaspWeb: Hymenoptera of the Afrotropical region. URL: www.waspweb.org (accessed on <day/month/year>).

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