The Sierola (Hymenoptera: Bethylidae) of Australia
Abstract
Sierola Cameron, 1881 is a highly diverse genus of aculeate ectoparasitoid wasps found across the Indo-Pacific region. Species are found on almost all Pacific high islands and mainland Asia. A few species have been described from Australia, but the genus has never been comprehensively treated there. Here, the Australian Sierola is reviewed for the first time, focusing on taxa that lack a high, sharp, clypeal carina. One hundred sixty-nine species from all regions are described as new, and S. vibrissata Ward, 2013 is recorded from Australia for the first time. As a result, there are now 177 species of Sierola recorded from Australia. This remains a first step on fully analyzing the genus, and at least as many or more species remain undescribed.
References
Ashmead W.H. 1901a. Notes on some New Zealand and Australian parasitic Hymenoptera, with descriptions of new genera and new species. Proceedings of the Linnean Society of New South Wales 25: 327–360. https://doi.org/10.5962/bhl.part.12157
Ashmead W.H. 1901b. Hymenoptera parasitica. In: Sharp D. (ed.) Fauna Hawaiiensis 1 (3): 277–364. Cambridge University Press, Cambridge, UK. Available from https://www.biodiversitylibrary.org/page/38883223 [accessed 19 Nov. 2025].
Atlas of Living Australia 2011. Open DELTA. Available from https://github.com/AtlasOfLivingAustralia/open-delta [accessed 19 Nov. 2025].
Azevedo C.O. 2006. Insecta, Hymenoptera, Bethylidae: range extension and filling gaps in Australia. Check List 2 (1): 42–44. https://doi.org/10.15560/2.1.42
Azevedo C.O., Alencar I.D.C.C., Ramos M.S., Barbosa D.N., Colombo W.D., Vargas-R. J.M. & Lim J. 2018. Global guide of the flat wasps (Hymenoptera, Bethylidae). Zootaxa 4489 (1): 1–294. https://doi.org/10.11646/zootaxa.4489.1.1
Barbosa D.N. & Azevedo C.O. 2018. Revision of Anisepyris Kieffer (Hymenoptera, Bethylidae), with description of 135 new species. Zootaxa 4416 (1): 1–258. https://doi.org/10.11646/zootaxa.4416.1.1
Cameron P. 1881. Notes on Hymenoptera, with descriptions of new species. Transactions of the Entomological Society of London 14: 555–577. https://doi.org/10.1111/j.1365-2311.1881.tb00881.x
Cassis G., Laffan S.W. & Ebach M.C. 2017. Biodiversity and bioregionalisation perspectives on the historical biogeography of Australia. In: Ebach M.C. (ed.) Handbook of Australasian Biogeography: 11–26. CRC Press. https://doi.org/10.1201/9781315373096-7
Colombo W.D., Brito C.D. & Azevedo C.O. 2024. Scratching the surface of Afrotropical Dissomphalus (Hymenoptera, Bethylidae): a revision uncovering 114 new species. Zootaxa 5441 (1): 1–130. https://doi.org/10.11646/zootaxa.5441.1.1
Dallwitz M.J. 1980. A general system for coding taxonomic descriptions. Taxon 29: 41–46. https://doi.org/10.2307/1219595
Dallwitz M.J., Paine T.A. & Zurcher E.J. 2000. User’s Guide to the DELTA System: a General System for Processing Taxonomic Descriptions. 4th Edition.
Dorchin N., Clarkin C.E., Scott E.R., Luongo M.P. & Abrahamson W.G. 2007. Taxonomy, life history, and population sex ratios of North American Dasineura (Diptera: Cecidomyiidae) on goldenrods (Asteraceae). Annals of the Entomological Society of America 100 (4): 539–548. https://doi.org/10.1603/0013-8746(2007)100[539:TLHAPS]2.0.CO;2
Fullaway D.T. 1920. New species of Sierola with explanatory notes. Occasional Papers of the Bishop Museum 7 (7): 57–159.
Gordh G. 1998. A new species of Sierola parasitic on moth larvae in Western Australia (Hymenoptera: Bethylidae). Proceedings of the Hawaiian Entomological Society 33: 83–88.
Hadley A. 2010. CombineZP - Free image stacking software for depth of field correction.
ICZN (International Commission on Zoological Nomenclature). 1999. International Code of Zoological Nomenclature. 4th Edition. The International Trust for Zoological Nomenclature, London. Available from https://www.iczn.org/the-code/the-code-online/ [accessed 19 Nov. 2025].
Kolesik P. & Gagné R.J. 2016. Revision of early taxa of Australian gall midges (Diptera: Cecidomyiidae). Zootaxa 4205 (4): 301–338. https://doi.org/10.11646/zootaxa.4205.4.1
Magnacca K.N. 2019. Two new species of Sierola Cameron (Hymenoptera: Bethylidae) from New Zealand and Australia. New Zealand Entomologist 42 (1): 13–20. https://doi.org/10.1080/00779962.2019.1602899
Magnacca K.N. 2020. Review of Sierola Cameron (Hymenoptera: Bethylidae) of the Hawaiian Islands. Part 1: O‘ahu. Bishop Museum Bulletin in Entomology 14: 1–311.
Magnacca K.N. 2024a. New Sierola Cameron, 1881 (Hymenoptera: Bethylidae) from Norfolk and Phillip Islands. Austral Entomology 63 (2): 210–223. https://doi.org/10.1111/aen.12684
Magnacca K.N. 2024b. Recircumscription of the genera Goniozus and Sierola (Hymenoptera: Bethylidae) based on morphological and molecular evidence. Zootaxa 5463 (2): 215–231. https://doi.org/10.11646/zootaxa.5463.2.3
Magnacca K.N. 2024c. Review of Sierola Cameron (Hymenoptera: Bethylidae) of the Hawaiian Islands. Part 2: Hawaiʻi. Bishop Museum Bulletin in Entomology 16: 1–203.
Nixon K.C. & Wheeler Q.D. 1990. An amplification of the phylogenetic species concept. Cladistics 6 (3): 211–223. https://doi.org/10.1111/j.1096-0031.1990.tb00541.x
Ramos M.S. & Azevedo C.O. 2012. Revision of Eupsenella Westwood, 1874 (Hymenoptera, Bethylidae). Zootaxa 3539: 1–80. https://doi.org/10.11646/zootaxa.3539.1.1
Ramos M.S., Perkovsky E.E., Rasnitsyn A.P. & Azevedo C.O. 2014. Revision of Bethylinae fossils (Hymenoptera: Bethylidae) from Baltic, Rovno and Oise amber, with comments on the Tertiary fauna of the subfamily. Neues Jahrbuch für Geologie und Paläontologie – Abhandlungen 271 (2): 203–228. https://doi.org/10.1127/0077-7749/2014/0385
Raven P.H. & Yeates D.K. 2007. Australian biodiversity: threats for the present, opportunities for the future. Australian Journal of Entomology 46 (3): 177–187. https://doi.org/10.1111/j.1440-6055.2007.00601.x
Santhosh S. 2017. A taxonomic revision of Sierola Cameron (Hymenoptera: Bethylidae) from Oriental region. In: Santhosh S., Nasser M. & Sudheer K. (eds) Insect Diversity and Taxonomy: 307–317. Prof. T.C. Narendran Trust for Animal Taxonomy, Calicut.
Sharkey M.J., Janzen D.H., Hallwachs W., Chapman E.G., Smith M.A., Dapkey T., Brown A., Ratnasingham S., Naik S., Manjunath R., Perez K., Milton M., Hebert P., Shaw S.R., Kittel R.N., Solis M.A., Metz M.A., Goldstein P.Z., Brown J.W., ... & Burns J.M. 2021. Minimalist revision and description of 403 new species in 11 subfamilies of Costa Rican braconid parasitoid wasps, including host records for 219 species. ZooKeys 1013: 1–665. https://doi.org/10.3897/zookeys.1013.55600
Sorg M. 1988. Zur Phylogenie und Systematik der Bethylidae (Insecta: Hymenoptera: Chrysidoidea). Geologisches Institut der Universitaet zu Koeln Sonderveroeffentlichungen 63: 1–146.
Srivathsan A., Ang Y., Heraty J.M., Hwang W.S., Jusoh W.F.A., Kutty S.N., Puniamoorthy J., Yeo D., Roslin T. & Meier R. 2023. Convergence of dominance and neglect in flying insect diversity. Nature Ecology & Evolution 7 (7): 1012–1021. https://doi.org/10.1038/s41559-023-02066-0
Turner R.E. 1915. Descriptions of new fossorial wasps from Australia. Proceedings of the Zoological Society of London 1915 (1–2): 41–69. https://doi.org/10.1111/j.1469-7998.1915.00041.x
Wang C.-H., He J.-H. & Chen X.-X. 2021. Taxonomy of Sierola Cameron (Hymenoptera, Bethylidae) from China with three new species. Journal of Hymenoptera Research 84: 405–415. https://doi.org/10.3897/jhr.84.68189
Ward D.F. 2013. Revision of Bethylidae (Hymenoptera) from New Zealand. New Zealand Entomologist 36 (2): 107–130. https://doi.org/10.1080/00779962.2012.759084
Wheeler Q.D. & Platnick N.I. 2000. The phylogenetic species concept (sensu Wheeler and Platnick). In: Wheeler Q.D. & Meier R. (eds) Species Concepts and Phylogenetic Theory: A Debate: 55–69. Columbia University Press, Chichester, New York.
Zborowski P. & Edwards E.D. 2007. A Guide to Australian Moths. CSIRO Publishing, Collingwood, Vic. https://doi.org/10.1071/9780643094642
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