Back Megadytes ducalis CEB オウサマゲンゴロウ Japanese Megadytes ducalis MIN Megadytes ducalis Dutch Megadytes ducalis Portuguese Megadytes ducalis Serbian Megadytes ducalis Swedish Megadytes ducalis Vietnamese Megadytes ducalis WAR
| Megadytes ducalis | |
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_Holotype_Brazil_(42556946761).jpg)
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| Holotype of Megadytes ducalis, housed in the Natural History Museum, London | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Coleoptera |
| Family: | Dytiscidae |
| Genus: | Megadytes |
| Species: | †M. ducalis
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| Binomial name | |
| †Megadytes ducalis Sharp, 1882
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Megadytes ducalis is a species of water beetle in the family Dytiscidae. It is the largest species in the family.[2] Until recently, the species was only known from a single specimen that was collected in the 19th century from Brazil,[3] but more specimens, also collected in the 19th century from Brazil, were discovered in 2019.[4] Although listed as extinct by the IUCN, the limited studies conducted on water beetles in Brazil means that it might still survive.[3]
- ^ World Conservation Monitoring Centre (1996). "Megadytes ducalis". IUCN Red List of Threatened Species. 1996: e.T12944A3400572. doi:10.2305/IUCN.UK.1996.RLTS.T12944A3400572.en. Retrieved 16 November 2021.
- ^ G.N. Foster; D.T. Bilton (2014). "The Conservation of Predaceous Diving Beetles: Knowns, Unknowns and Anecdotes". In D.A. Yee (ed.). Ecology, Systematics, and the Natural History of Predaceous Diving Beetles (Coleoptera: Dytiscidae). Springer. pp. 437–462. ISBN 978-94-017-9109-0.
- ^ a b Adriano Pereira Paglia (2007). Espécies ameaçadas da fauna brasileira: análise dos padrões e dos fatores de ameaça (PDF). Instituto de Ciências Biológicas - Universidade Federal de Minas Gerais.
- ^ Hendrich, Lars; Manuel, Michael; Balke, Michael (2019-04-18). "The return of the Duke—locality data for Megadytes ducalis Sharp, 1882, the world's largest diving beetle, with notes on related species (Coleoptera: Dytiscidae)". Zootaxa. 4586 (3): 517–535. doi:10.11646/zootaxa.4586.3.8. ISSN 1175-5334. PMID 31716121.