Abstract
The genus Ancyloscelis Latreille, 1829 (Hymenoptera: Apidae), a taxon restricted to the Neotropics and southern Nearctic (Michener 1942, 2000, 2007; Schaller and Roig-Alsina 2021; Melo 2022), has been difficult to place precisely within the higher classification of bees (Roig-Alsina and Michener 1993; Aguiar et al. 2019; Freitas et al. 2020), and even the genus name has a confusing history (see Michener 1942). Michener (1944) placed it together with Exomalopsis Spinola, 1853 within the Exomalopsini Vachal, 1909, and Michener and Moure (1957) later expanded this tribe to include ten additional genera, with Ancyloscelis the sole member of one of the five distinct sections they recognized (reviewed by Silveira 1993). Later, Jesus S. Moure (cited in Roig-Alsina and Michener 1993) suggested that the placement of Ancyloscelis should be within Emphorini Robertson, 1904, a position supported in that work. However, Roig-Alsina and Michener (1993) concluded that it differed enough from other members to recognize two subtribes, proposing Ancyloscelina Roig-Alsina and Michener, 1993 containing only the type genus, with the remaining Emphorini recognized at that time (i.e., Diadasia Patton, 1879, Diadasina Moure, 1950, Melitoma Lepeletier and Serville, 1828, and Ptilothrix Smith, 1853) placed in subtribe Emphorina Robertson, 1904. Michener (2000, 2007) and others (Silveira et al. 2002, Rodríguez and Roig-Alsina 2004) continued to recognize Ancyloscelis within Emphorini, but subtribal classifications were not used in those works.
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