Megachile (Carinula) butteli Friese, 1918

Ascher, John S., Soh, Zestin W. W., Chui, Shao Xiong, Soh, Eunice J. Y., Ho, Benjamin M., Lee, John X. Q., Gajanur, Anya R. & Ong, Xin Rui, 2022, The bees of Singapore (Hymenoptera: Apoidea: Anthophila): First comprehensive country checklist and conservation assessment for a Southeast Asian bee fauna, Raffles Bulletin of Zoology 70, pp. 39-64 : 50

35. Megachile (Carinula) butteli Friese, 1918 , Buttel- Reepen’s Resin Bee

This species has only been recorded for Singapore twice. The first record, a male visiting Cratoxylum cochinchinense at Upper Peirce Reservoir Park in 2012, was provisionally listed as Megachile (Callomegachile) sp. 1 (nr. stulta ) in Ascher et al. (2016b). In 2021, the more distinctive female was discovered at the Sungei Buloh Wetland Reserve, allowing confirmation of its specific identity ( Soh et al., 2021a). It is listed as Megachile (Carinula) sp. aff. butteli in the Guide to the Bees of Singapore ( Soh & Ascher, 2020). Subgeneric status of this group of resin bees is discussed by Chattanabun et al. (2020).