Megachile pluto Smith, 1860
Wallace's giant bee, Giant mason bee
IUCN status: [url=https://www.iucnredlist.org/details/4410/0]Vulnerable[/url]
A single specimen was collected in 1858 or 1859 by Alfred Russel Wallace. The species then went missing until it was rediscovered by Adam Messer in 1981. It then went missing a second time until it was collected on Bacan in February 2018.
Dollin, Anne. (2001). The largest bee in the world. Available at: https://www.aussiebee.com.au/aussiebeeonline004.pdf [accessed 16 June 2018]
Groombridge, B. (ed.). 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.
IUCN. 1990. IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.
Kuhlmann, M. 2014. Megachile pluto. The IUCN Red List of Threatened Species 2014: e.T4410A21426160. https://dx.doi.org/10.2305/IUCN.UK.2014-1.RLTS.T4410A21426160.en. Downloaded on 12 March 2017.
Messer, Adam Catton. (1984). [i]Chalicodoma pluto[/i]: the world's largest bee rediscovered living communally in termite nests (Hymenoptera: Megachilidae). Journal of the Kansas Entomological Society 57(1): 165-168. [[url=https://www.jstor.org/stable/25084498?seq=1#page_scan_tab_contents]Abstract[/url]]
Vereecken, Nicolas J. (2018). Wallace’s Giant Bee for sale: implications for trade regulation and conservation. Journal of Insect Conservation. https://doi.org/10.1007/s10841-018-0108-2 [Abstract]
Wells, S.M., Pyle, R.M. and Collins, N.M. (compilers) 1983. The IUCN Invertebrate Red Data Book. IUCN, Gland, Switzerland and Cambridge, UK.