Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium aztecum Cresson, 1878
Common name: none
Anthidium (Anthidium) aztecum have reddish-brown to black integument with yellow maculations (Gonzalez and Griswold 2013). They have white to brown pubescence on their vertex, disc of the scutum, inner tarsi, terga, and S6. Females range in body length from 10–12.2 mm; males range in body length from 11.1–12.3 mm (Gonzalez and Griswold 2013).
(modified from Gonzalez and Griswold 2013)
Anthidium aztecum may be confused with A. hallinani, A. macushi, and A. sanguinicaudum based on the dull, and finely and densely punctate terga and weakly elevated discal areas (Gonzalez and Griswold 2013). Female A. aztecum can be differentiated from A. hallinani by the visibly depressed apical rim that extends across the length of T6 and the lack of a short carina above the median emargination of T6 (Gonzalez and Griswold 2013). Male A. aztecum can be differentiated from A. hallinani by the narrow brush of sparse reddish-brown hairs on S4 and a sharply projected lateral lobe of S6. Anthidium aztecum can be differentiated from A. macushi and A. sanguinicaudum because A. aztecum lacks an acute lateral projection on T6 of the female (Gonzalez and Griswold 2013).
Anthidium aztecum adults have been recorded in flight from August to early November (Gonzalez and Griswold 2013).
Floral associations are unknown.
Nesting behavior is unknown.
Anthidium aztecum occur in Jalisco, Michoacán, and Oaxaca, Mexico. They are found in dry forests along the Pacific slope (Gonzalez and Griswold 2013). None are known to occur in the U.S. or Canada.
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