Ancylandrena atoposoma (Cockerell, 1934) [Holotype: USNM; ♂ Riverside, California, US; April 25, 1930] This species of Ancylandrena was previously reported as the sole representative in the BCP by Ayala et al. (1996). It inhabits the Coastal Sage Matorral, Succulent Coastal Sage and Chaparral ecoregions. Two females are reported from Sierra San Pedro Mártir in May 1958 (EMEC) and a third one in Ensenada in April 1941 (USNM) in the generic revision by Zavortink (1974). The BBPT collected one male in April 2021 and six females in April 2022 from Valle de Guadalupe, six females and three males from Sierra San Pedro Mártir, and one female and male from the transition zone between the Succulent Coastal Sage and the Central Desert in April 2023 (MABC). See fig. 6.

Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 48, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532