Euglossini

orchid bees, euglossine bees

Genus Guides

Euglossa(orchid bees)

, commonly known as orchid bees, is a tribe of approximately 200 in five (Euglossa, Eulaema, Eufriesea, Exaerete, and Aglae) distributed throughout the Neotropics. The tribe is unique among corbiculate bees in that non-parasitic members exhibit diverse social ranging from solitary to primitively eusocial, rather than uniform eusociality. Males are distinguished by their exclusive behavior of collecting volatile fragrances from orchids and other sources, storing them in specialized hind tibial pockets for use in . This fragrance collection drives mutualistic relationships with orchids, where male bees serve as exclusive for many species.

Euglossini by (c) Francisco Farriols Sarabia, some rights reserved (CC BY), uploaded by Francisco Farriols Sarabia. Used under a CC-BY license.

Dilemma Orchid Bee - Euglossa dilemma, Crocodile Lake National Wildlife Refuge, Key Largo, Florida - 01 by Judy Gallagher. Used under a CC BY 2.0 license.

Euglossa dilemma 243530252 by Guy Babineau. Used under a CC0 license.

Pronunciation

How to pronounce Euglossini: //juːˈɡlɒsɪˌnaɪ//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Most except Eulaema display brilliant metallic coloration, primarily green, gold, and blue. Males possess uniquely modified legs with specialized brushes on the forelegs, combs on the middle legs, and sponge-like cavities in the hind tibiae for fragrance storage. Exaerete and Aglae are kleptoparasites lacking pollen-carrying structures. Females have corbiculae () on the hind legs. identification requires examination of male genitalia and tibial coloration; for example, Euglossa rufipes males have distinctive red hind tibiae.

Images

Habitat

Neotropical forests ranging from lowland rainforests to montane cloud forests. Females utilize diverse nesting sites including rotting wood, nests, and preexisting cavities. Males patrol specific territories near fragrance sources in the forest understory. Some occupy shrubby Caatinga and altered , though richness and abundance decline with anthropogenic disturbance.

Distribution

Native to the Neotropical region from Mexico to Argentina, with greatest in the Amazon basin and Atlantic coastal forests of Brazil. One , Euglossa dilemma, has become established in Florida, USA. Species of Eulaema and Eufriesea have been reported from Arizona and Texas, USA.

Seasonality

Activity patterns vary by and region. Eufriesea species tend to be seasonal and associated with submontane or montane . In the Caatinga, show marked seasonality. Male fragrance collection shifts with temporal changes in resource availability; for Euglossa imperialis, preference for cineole increases later in the year relative to methyl salicylate.

Diet

feed on nectar. Females collect pollen, nectar, and resin from diverse plants for larval provisioning and nest construction. Males collect volatile compounds (fragrances) from orchids in subtribes Stanhopeinae and Catasetinae, plus non-floral sources including rotting wood, fungi, and . Specific plant utilized include Araceae (Spathiphyllum, Anthurium), Gesneriaceae (Drymonia, Gloxinia), Solanaceae (Cyphomandra), and Euphorbiaceae (Dalechampia).

Life Cycle

Complete . Females construct nests containing provisioned with pollen-nectar mixtures. Development time varies with and environmental conditions. Social organization ranges from solitary to communal to primitively eusocial; most species are solitary.

Behavior

Males do not return to nests after hatching. They exhibit complex territorial and hovering at fragrance sources, forming -like at display sites where matings occur. The fragrance collection mechanism involves brushing forelegs against flowers, transferring compounds to middle leg combs, then pressing combs into hind tibial grooves to squeeze volatiles past waxy hairs into storage cavities. Eufriesea purpurata males uniquely collect (aldrin, ) in large quantities without harm. Exaerete and Aglae are kleptoparasites, laying in nests of other orchid bees.

Ecological Role

Primary of orchids in neotropical forests; many orchid depend exclusively on males for pollination. Orchids exhibit highly specific placement of pollinia on male bodies, ensuring cross-pollination. Also contribute to pollination of diverse non-orchid flowering plants. Resin collection may influence plant defense chemistry. Serve as potential bioindicators of quality.

Human Relevance

Research subjects for studies of chemical , sensory evolution, and speciation. Scientists use synthetic fragrance compounds as to attract males for study and inventory. Charismatic organisms used in museum exhibits and educational programs. Eufriesea purpurata's collection has drawn scientific attention.

Similar Taxa

other Apidae differ from other corbiculate bees (honey bees, bumble bees, ) in their diverse social systems and unique male fragrance collection ; other corbiculates are uniformly eusocial and lack fragrance collection.
other beesThe combination of metallic coloration (in most ), male-specific hind tibial fragrance storage organs, and exclusive orchid pollination mutualism distinguishes them from all other groups.