Geniotrigona thoracica ( Smith, 1857 )

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 : 47

12. Geniotrigona thoracica ( Smith, 1857) , Long-chinned Stingless Bee

This species was described from a worker collected in Singapore by Wallace ca. 1854, and the obscure Trigona pallidicincta Cockerell, 1918a , recognised by us as a probable new synonym of G. thoracica ( Ascher et al., 2019) , also has a type locality from Singapore. The most recent records of this species in Singapore are from Taban Valley at Bukit Timah from 1976. As this is the largest-bodied stingless bee in the region and distinctive in colour and behaviour (e.g., form of nest entrance), we think it is unlikely that it would have been overlooked by us and other qualified investigators (e.g., Liow et al., 2001) if extant in Singapore. Although we think it is likely to be extirpated, we did not include it in the Nationally Extinct category because it does not meet the 50-year threshold.