Tetragonula (Tetragonula) geissleri ( Cockerell, 1918a )

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 : 49

30. Tetragonula (Tetragonula) geissleri ( Cockerell, 1918a) , Geissler’s Stingless Bee

Most recent records of this species were from forests in the central parts of Singapore including Bukit Timah, Dairy Farm, and Nee Soon, but it was also recorded from Singapore Botanic Gardens and acknowledged to be scarce. It was recorded in 1922 at Mandai ( Schwarz, 1939), and has been noted to nest in termite mounds (Soh, 2018). A recent report on the bees of Cambodia ( Ascher et al., 2016a reported this species from Cambodia, but when restudied it proved to be misidentified. We now suspect that this and all other reports of T. geissleri from far outside the Sundaic Region pertain instead to T. hirashimai ( Sakagami, 1978) or to additional cryptic forms.