Hylaeus (Hylaeus) mariannae Theunert, 2013

This taxon was recently synonymised with Hylaeus angustatus (Schenck, 1861) by Dathe (2023). As mentioned in Ghisbain & Rosa et al. (2023), this taxon requires a more in-depth study. Examination of more extensive material and DNA barcoding suggest that it is a distinct species (Le Divelec, unpublished). Therefore, we decide to not follow the recent synonymization of Dathe (2023) and continue to treat H. mariannae as a distinct species.