Megachile (Austromegachile) are small to medium-sized bees with black to brown integument on most of their body and sometimes red integument on their legs (Michener 2007). They range in body length from 7.5–16 mm (Michener 2007).
Megachile (Austromegachile) may be confused with Megachile (Rhyssomegachile) since they both have a similar four-toothed mandible and a strong preoccipital carina laterally. Female Megachile (Austromegachile) can be differentiated by the larger, cutting edges in the second and third interspaces on the mandible. Males can be differentiated by the low, inconspicuous preapical carina on T6 (Gonzalez et al. 2018).
Megachile (Austromegachile) has been observed visiting multiple species within Arecaceae, Anacardiaceae, Asclepiadaceae, Asteraceae, Euphorbiaceae, Fabaceae, Lamiaceae, Myrtaceae, Onagraceae, Passifloraceae, and Rubiaceae (Steiner et al. 2010; Marinho et al. 2018).
Megachile (Austromegachile) consists of twenty-nine species (Ascher and Pickering 2020).
There are no known invasives.
Megachile (Austromegachile) ranges from Argentina in South America north as far as Hidalgo and Sinaloa in Mexico (Michener 2007).