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Diadegma insulare (Cresson) 

(Life: Kingdom: Metazoa (animals); Phylum: Arthropoda; Class: Hexapoda; Order: Hymenoptera;  Superfamily: Ichneumonoidea; Family: Ichneumonidae; Subfamily: Campopleginae; Genus: Diadegma)

Mesoleptus insulare Cresson, 1865. Holotype: in  Type locality:

Distribution

Afrotropical Region: Reunion, Senegal.

Also in North and Central America, Cuba, Jamaica, Colombia, Venezuela, Morocco, Israel, Tahiti, Hawaii, Society Islands.

Biology

Host: Plutella xylostella, P. operculella, P. omissa, P. armoraciae (Lepidoptera: Plutellidae) and Hellula undalis (Lepidoptera: Pyralidae).

Diagnosis

Characterized among Diadegma species by the area superomedia, apically narrowed and delimited, and the tergites VI-VII of females not to slightly indented (Rousse & Villemant, 2012).

Comments

The presence of D. insulare in Reunion surprised Rousse & Villemant (2012) who instead expected to find D. semiclausum, which was introduced into Mauritius in 1991 from Taiwan (Dunhawoor & Abeeluck 1998). However, all 12 specimens they examined have an area superomedia distinctly narrowed posteriorly (for most of them the area is even distinctly apically closed). This character is the most reliable to differentiate D. insulare from its close relatives D. semiclausum and D. mollipla. According to Azidah et al. (2000) D. semiclausum and D. insulare are very similar, both also being differentiated by the emargination of apical tergites in females. None of the females examined by Rousse & Villemant bore a distinct indentation on the apical tergite (Rousse & Villemant, 2012).

References

Azidah, A.A., Fitton, M.G. & Quicke, D.L.J. 2000. Identification of the Diadegma species (Hymenoptera: Ichneumonidae, Campopleginae) attacking the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae). Bulletin of Entomological Research, 90(5), 375–389.

Dunhawoor, C. & Abeeluck, D. 1998. Integrated control of Plutella xylostella (L.)(Lepidoptera: Yponomeutidae) in Mauritius. In N. S. Talekar (Ed), 2nd Annual Meeting of Agricultural Scientist, 12–13 Aug. 1997, Réduit, Mauritius, 1998. Food and Agricultural Research Council, pp 181–187.

Labou, B. Bordat, D. Niang, A.A. & Diarra, K. 2016. First record of the larval parasitoid Diadegma insulare (Cresson) (Hymenoptera: Ichneumonidae: Campopleginae) from Senegal. African Entomology 24: 533-535.

Rousse, P. & Villemant, C. 2012. Ichneumons in Reunion Island: a catalogue of the local Ichneumonidae (Hymenoptera) species, including 15 new taxa and a key to species. Zootaxa 3278: 1–57.

Credits

Photographs by Agnièle Touret-Alby © MNHN (specimens database http://coldb.mnhn.fr).

Map illustration © Simon van Noort (Iziko Museums of South Africa).

 

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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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