Ceratina nanula Cockerell, 1897:352, ♂. ♂, Las Cruces, New Mexico, April 25th. - Cockerell & Porter, 1899Cockerell, T.D.A. & W. Porter 1899. Contributions from the New Mexico Biological Station. - VII Observations on bees, with descriptions of new genera and species. The Annals and Magazine of Natural History ser. 7: v. 4:403-421. (distribution); Cockerell, 1899Cockerell, T.D.A. 1899. Catálogo de las Abejas de Mexico. Biblioteca Agricola de las Secretaria de Fomento, Mexico, 1-20. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Flower and insect records from New Mexico. Entomological News 12 (2):38-43. (distribution); Cockerell, 1902Cockerell, T.D.A. 1902. Flowers and insects in New Mexico. American Naturalist 36 (430):809-817. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. New Rocky Mountain bees, and other notes. The Canadian Entomologist 38 (5):160-166. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. The bees of Boulder County, Colorado. University of Colorado Studies 4:239-259. (distribution); Cockerell, 1924Cockerell, T.D.A. 1924. Expedition of the California Academy of Sciences to the Gulf of California in 1921. The bees (II). Proceedings of the California Academy of Sciences 12 (27):529-560. (distribution); Cockerell, 1926Cockerell, T.D.A. 1926. Descriptions and records of bees. - CXIII. The Annals and Magazine of Natural History ser. 9: v. 18 (108):621-627. (distribution); Cockerell, 1930Cockerell, T.D.A. 1930. Bees from Mesa Verde, Colorado, in the American Museum of Natural History. American Museum Novitates 397:1-8. (distribution); Michener, 1936Michener, C.D. 1936. Western bees of the genus Ceratina, subgenus Zaodontomerus. American Museum Novitates 844:1-13. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution).
Ceratina nanula rigdenae Michener, 1936:3, ♂♀. Holotype ♀, California, Big Bear (San Bernardino Mountains) (The American Museum of Natural History, leg. I. Wilson). - Michener, 1936Michener, C.D. 1936. Western bees of the genus Ceratina, subgenus Zaodontomerus. American Museum Novitates 844:1-13. (distribution); Cockerell, 1942Cockerell, T.D.A. 1942. Collecting wild bees in the Yosemite. The Pan-Pacific Entomologist 18:136-139. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:2180 ( listed as synonym of Ceratina nanula Cockerell, 1897).