Genus: Megachile Latreille, 1802
Subgenus: Sayapis Titus, 1906
Common name: none
Megachile (Sayapis) are slender, narrow, parallel-sided bees with black integument on the head, thorax, and abdomen and pale apical bands on the terga (Mitchell 1937b; Michener 2007). They range in body length from 10–18 mm (Mitchell 1937b).
Megachile (Sayapis) may be superficially confused with bees within the subgenus Megachile (Chelostomoides) as both have narrow, parallel-sided abdomens (Michener 2007). Male Megachile (Sayapis) can be differentiated from Megachile (Chelostomoides) by the four exposed sterna in repose (Michener 2007). Female Megachile (Sayapis) can be differentiated from Megachile (Chelostomoides) by the mandible with a single cutting edge in the second interspace and nowhere else (Mitchell 1937b; Michener 2007).
Megachile (Sayapis) are polylectic and have been recorded visiting multiple plant families, including Acanthaceae, Amaranthaceae, Apocynaceae, Aquifoliaceae, Arecaceae, Asteraceae, Boraginaceae, Cactaceae, Cleomaceae, Euphorbiaceae, Fabaceae, Lamiaceae, Lythraceae, Malvaceae, Olacaceae, Onagraceae, Plantaginaceae, Polemoniaceae, Polygonaceae, Rhamnaceae, Rubiaceae, Tamaricaceae, Verbenaceae, and Zygophyllaceae (Deyrup et al. 2002; Raw 2007).
Megachile (Sayapis) typically create nests using cut leaves and soil (mud or sand) in pre-existing cavities, although nesting behavior varies by species (Raw 2007). These bees have been observed nesting in a variety of both natural and man-made locations: Megachile zaptlana has been observed nesting in abandoned beetle burrows, M. cylindrica in Peruvian peppertree (Schinus polygamus) galls, M. policaris in adobe walls, and M. inimica in mesquite trees and fence posts (Raw 2007).
There are no known invasives.
Megachile (Sayapis) is native to North and South America, where they range from Canada to Argentina (Michener 2007).