Diachasma alloeum


The parasitic wasp Diachasma alloeum (Hymenoptera: Braconidae: Opiinae), native to North America, attacks flies in the Rhagoletis pomonella (Diptera: Tephritidae) sibling species complex (Forbes et al. 2010). Wasps use olfactory cues to locate host fruit as the site for mating and oviposition of eggs into fly larvae (Forbes et al. 2009). The wasp larva consumes its fly host and overwinters in the fly puparium. The adult wasp emerges the following summer (Forbes et al. 2009).

Evidence suggests that D. alloeum is undergoing ecological speciation via sequential divergence (Forbes et al. 2009; Hood et al. 2015); ecological speciation at one trophic level (the fly trophic level) appears to be inducing a similar speciation event at the adjacent trophic level (the parasitoid trophic level). The wasps show genetic, behavioral and physiological differences that reduce gene flow between host forms attacking different fly taxa. The D. alloeum genome will allow for investigation of questions relating to the generation of biodiversity and the cascading effects of speciation processes.

Forbes, A.A., Powell, T.H.Q., Stelinski, L.L., Smith, J.J., Feder, J.L. 2009. Sequential sympatric speciation across trophic levels. Science 323:776-779.
Forbes, A.A., Hood, G.R., Feder, J.L. 2010. Geographic ranges and host breadths of parasitoid wasps associated with the Rhagoletis pomonella (Diptera: Tephritidae) species complex. Annals of the Entomological Society of America 103:908-915.
Hood, G.R., Forbes, A.A., Powell, T.H.Q., Egan, S.P., Hamerlinck, G., Smith, J.J., Feder, J.L. 2015. Sequential divergence and the multiplicative origin of community diversity. Proceedings of the National Academy of Science USA 112:E5980-5989.

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Image Credit: Copyright Andrew Forbes, University of Iowa
Organism Image
Feature Summary
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Contig N50
Scaffold N50
Number Of Genes
Community Contact
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Image Credit
Copyright Andrew Forbes, University of Iowa

Assembly Information

Analysis Name Diachasma alloeum genome assembly Dall2.0 (GCF_001412515.2)
Software SOAPdenovo v. 2.04; PBJelly v. July-2014 (NA)
Source SAMN03701895
Date performed 2019-03-06
Materials & Methods

Details are available in the associated publication, https://doi.org/10.1093/gbe/evz205


Assembly Metrics
Contig N50 NA
Scaffold N50 657,001
GC Content 39.52