Anthidiellum (Pycnanthidium) smithii smithii ( Ritsema, 1874 )

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 : 48

17. Anthidiellum (Pycnanthidium) smithii smithii ( Ritsema, 1874) , Smith’s Rotund-Resin Bee

The genus was newly recorded in Singapore in 2014 during a drought-induced flowering event from forest sites at Dairy Farm and Bukit Timah ( Soh et al., 2016). Individuals of this species were observed to collect pollen from exotics ( Muntingia calabura ) and weeds ( Bidens pilosa ), but the origins of resin used in nest building is unknown ( Soh et al., 2016). Attempts to locate this species at those localities were unsuccessful after its exotic pollen host plants were removed (Zestin W. W. Soh & Eunice J. Y. Soh, personal observation), but it was found in 2019 at a new locality at HortPark where it was observed to utilise artificial nesting blocks ( Soh & Soh, 2020). The species is widely distributed in Southeast Asia, with considerable geographic variation in colour pattern ( Pasteels, 1972; Soh et al., 2016).