Megachile gentilis

Cresson, 1872

Megachile gentilis is a solitary leafcutter bee in the Megachilidae, described by Cresson in 1872. It is a non-metallic, robust black that constructs nests using leaf pieces or plant resin. Females carry pollen on the underside of the and create "bee loaves" of pollen, nectar, and saliva to provision . The has been recorded in North America, Middle America, and Oceania.

Leafcutter bee pupae by Anna R. Holden, Jonathan B. Koch, Terry Griswold, Diane M. Erwin, Justin Hall. Used under a CC BY 2.5 license.

Pronunciation

How to pronounce Megachile gentilis: /ˌmɛɡəˈkaɪli ˈdʒɛnˌtɪləs/

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Identification

Distinguished from other Megachile by the concave basal without ridges, nearly perpendicular , and linear notaulices. The combination of broad scutellum, straight margin, and lack of carinae on and provides additional diagnostic features. Females can be recognized by the large dentate used for cutting leaves and carrying resin.

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Appearance

A robust, non-metallic black . The basal section of is concave anteriorly and lacks ridges. The is nearly perpendicular to the rear of the propodeum, with a roughly straight margin and broad scutellum. and lack carinae. Notaulices are linear. Males often have spinose front and enlarged front . Females possess large, dentate . The front wings have two recurrent attached to a submarginal . Four sternites are visible, with four additional hidden sternites.

Habitat

Nests in soil, plant stems, twigs, or tunnels through rotting wood. Requires access to leaves or plant resin for nest construction and flowers for foraging.

Distribution

Recorded from North America, Middle America, and Oceania. GBIF distribution records indicate presence in these regions, though specific range boundaries within these areas are not well documented.

Diet

feed on nectar; larvae feed on " loaves" composed of pollen, nectar, and saliva deposited by females in .

Life Cycle

Females construct nests in pre-existing cavities or excavated substrates, lining with cut leaf pieces or dried plant resin. Each cell is provisioned with a " loaf" of pollen, nectar, and saliva, upon which an is deposited. Cells are sealed with leaf material. Larvae feed on the provision, overwinter, and emerge the following spring by gnawing through nest walls.

Behavior

Solitary; females cut oval or circular leaf sections to line nest , or alternatively collect dried plant resin in their for nest lining. Females carry pollen on scopal hairs beneath the ( scopa) rather than on leg baskets. Defends nest with weak sting.

Ecological Role

of wild plants and crops. As a leafcutter bee, contributes to plant through pollen transfer. Nest construction activities may provide incidental for other organisms in rotting wood or stems.

Human Relevance

Contributes to pollination of crops and wild plants. Does not produce honey. Weak sting poses minimal threat to humans. May occasionally cut leaves from garden plants for nest construction, though damage is generally minor.

Similar Taxa

  • Megachile sculpturalisBoth are robust Megachile , but M. sculpturalis is larger, native to Asia, and has been introduced to North America. M. gentilis is smaller and native to the Americas.
  • Other Megachile speciesMany Megachile share leaf-cutting , but M. gentilis can be distinguished by the specific combination of tergal structure, angle, and lack of carinae.

More Details

Etymology

The name Megachile derives from Greek mega (large; μέγας) and cheil (lips; χείλος), referring to the large mouthparts characteristic of the genus.

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