Megachilini

leaf-cutter bees, resin bees, leaf-cutter and resin bees

Genus Guides

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Megachilini is the most -rich tribe within the Megachilidae, comprising four : Megachile, Coelioxys, Noteriades, and Radoszkowskiana. The tribe is notable for the leaf-cutting exhibited by many Megachile species, wherein females cut and process fresh leaves for nest construction using specialized interdental laminae—razor-like structures between the mandibular teeth. This morphological innovation may have triggered subsequent diversification within the group. The tribe also includes cleptoparasitic genera (Coelioxys and Radoszkowskiana) that exploit Megachile nests. Phylogenetic relationships within and among genera remain poorly resolved despite the group's high diversity and global distribution.

Megachile melanophaea by no rights reserved, uploaded by Steve Wells. Used under a CC0 license.Coelioxys dolichos by (c) Laura Clark, some rights reserved (CC BY), uploaded by Laura Clark. Used under a CC-BY license.Megachile by (c) Amy Schnebelin, some rights reserved (CC BY), uploaded by Amy Schnebelin. Used under a CC-BY license.

Pronunciation

How to pronounce Megachilini: /ˌmɛɡəˈkɪlaɪni/

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Identification

Megachilini can be distinguished from other megachiline tribes by the combination of morphological characters used in the tribe's circumscription, though precise diagnostic features require examination. Within the tribe, are distinguished by mandibular structure and other external characters: Megachile typically possess interdental laminae for leaf-cutting (though not all species exhibit this trait); Coelioxys and Radoszkowskiana are cleptoparasitic with associated morphological modifications; Noteriades lacks the derived mandibular structures of leaf-cutting Megachile. The presence or absence of interdental laminae and their developmental origin (two different mandibular structures) are key characters for distinguishing subgroups within Megachile.

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Distribution

distribution with documented across multiple continents. Megachile sculpturalis, a representative species, is native to East Asia and has established in North America (first reported 1994, with rapid expansion) and Europe (first observed 2008 in France). Chinese species of Megachile (Chelostomoda) have documented distributions within China.

Host Associations

Behavior

Leaf-cutting : some Megachile cut and process fresh leaves for nest construction, facilitated by interdental laminae—razor-like structures between female mandibular teeth. Cleptoparasitism: Coelioxys and Radoszkowskiana females infiltrate Megachile nests to lay , with larvae consuming provisions.

Ecological Role

Pollination: Megachile are with documented floral associations. Cleptoparasitism: Coelioxys and Radoszkowskiana function as nest within the tribe, potentially regulating .

Human Relevance

Megachile sculpturalis has been introduced to North America and Europe, where it has established expanding ; ecological impacts of this introduction are under investigation. Some Megachile are managed or utilized for pollination services.

Similar Taxa

  • other Megachilidae tribesMegachilini is distinguished from other megachiline tribes by its constituent and the leaf-cutting present in many Megachile ; other tribes lack the interdental laminae structure and associated leaf-processing behavior
  • Apidae (honey bees, bumble bees)Megachilini carry pollen on the scopa () rather than on hind legs; nest in pre-existing cavities using cut leaves or resin rather than constructing wax combs or underground colonies

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Sources and further reading