Genus: Ceratina Latreille, 1802
Subgenus: Euceratina Hirashima, Moure, and Daly, 1971
Common name: small carpenter bees
Ceratina (Euceratina) consists of rather weakly metallic and strongly punctate species with pale markings that, if present, are limited to the face, pronotal lobe, and legs. Their body length varies between 6–14 mm (Michener 2007).
Species of Ceratina (Euceratina) can be confused with species of the subgenera Ceratina (Ceratinidia), Ceratina (Ceratina), and Ceratina (Neoceratina) but they can be separated by the lack of gradulus on T5 and the longitudinal keel on T6 in Euceratina. The male gonostylus is also distinctive, as described above, but this character requires dissection.
The adventive species, Ceratina (Euceratina) dallatorreana has been observed visiting the flowers of Centaurea (Asteraceae), Convolvulus (Convolvulaceae), and Melilotus (Fabaceae) (Daly 1966).
Ceratina (Euceratina) species have been reported nesting in dry stems of Adoxaceae (Sambucus), Asteraceae (Artemisia), Brassicaceae (Brassica), Polygonaceae (Eriogonum, Rumex), Rosaceae (Rubus), and Simaroubaceae (Ailianthus) (Daly 1966; Daly 1983)
The species Ceratina dallatorreana Friese, native to the Mediterranean region, was first reported in California in 1949 where it is now established (Daly 1966). This species reproduces by thelytokous parthenogenesis; only females have been found in the U.S. (Daly 1966).
Ceratina (Euceratina) occur from Britain east to southern Russia and Pakistan, and south to Somalia (Michener 2007). One species has been introduced to the U.S., Ceratina dallatorreana (Daly 1966).