Genus: Ceratina Latreille, 1802
Subgenus: Zadontomerus Ashmead, 1899
Common name: small carpenter bees
Ceratina (Zadontomerus) is the most diverse Ceratina subgenus in North America. They have black, weakly metallic integument and sometimes pale maculations that are limited to the head, pronotal lobe, and legs. Their body length varies from 4–12 mm, but is usually between 5–7 mm (Michener 2007).
Ceratina (Zadontomerus) may be confused with species of Ceratina (Ceratinula), but they can be separated by the punctuation on the face and the presence of a preoccipital carina, which is absent in Ceratina (Ceratinula).
Ceratina (Zadontomerus) have been observed visiting flowers from a broad spectrum of genera in multiple plant families including Amaranthaceae, Amygdaloideae, Apiaceae, Asteraceae, Boraginaceae, Brassicaceae, Cactaceae, Cannaceae, Caryophyllaceae, Ericaceae, Euphorbiaceae, Fabaceae, Grossulariaceae, Hypericaceae, Iridaceae, Lamiaceae, Malvaceae, Nelumbonaceae, Oleaceae, Onagraceae, Paeoniaceae, Papaveraceae, Phrymaceae, Plantaginaceae, Polemoniaceae, Polygonaceae, Ranunculaceae, Rhamnaceae, Rosaceae, Salicaceae, Tropaeolaceae, Verbenaceae, and Vitaceae (Michener and Eickwort 1966; Daly 1973).
Ceratina (Zadontomerus) have been found nesting in pithy stems and twigs of plants in multiple families including; sumac (Anacardiaceae), teasel (Caprifoliaceae), and raspberry (Rosaceae) (Rehan and Richards 2010; Vickruck et al. 2010). They have also been observed reusing the nests of Ceratina ignara (Michener and Eickwort 1966).
Ceratina (Zadontomerus) includes 29 described species (Ascher and Pickering 2020).
There are no known invasives.
Ceratina (Zadontomerus) occur from Quebec to British Columbia in Canada, south throughout North and Central America to northern Colombia and Venezuela (Michener 2007).