| Bee, Eucera longicornis, Insect, Hymenopterans, Apidae|
Eucera is a genus of bees in the family Apidae, subfamily Apinae, and tribe Eucerini - the long-horned bees.
As in most members of the tribe Eucerini, the antennae of males are very long. Old World Eucera can be identified through having five or six maxillary palpomeres, with the first flagellomere shorter than the scape and the clypeus protuberan in front of the compound eye by at least the width of the eye in side view. These characteristics are found in both sexes. Additionally, the males have convergent carinae on S6. Eucera species nest in the ground. Some species are important pollinators of alfalfa.
Eucera is holarctic. It is present in most of Europe, in the East Palearctic ecozone, in the Near East, in North Africa, and in the Oriental ecozone.
This genus has 219 species, of which 78 are known from Europe.