Anthidium atripoides

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium atripoides Cresson, 1879
Common name: none

Overview

Anthidium (Anthidium) atripoides have black integument and cream or yellow-colored maculations (Gonzalez and Griswold 2013). Females have black scopa and pubescence on their legs and white pubescence throughout the rest of their body. Females range in body length from 8.5–11.5 mm (Gonzalez and Griswold 2013). Males have black and white pubescence on their legs and primarily white pubescence throughout the rest of their body. Males range in body length from 9.2–11.5 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

May be confused with

Anthidium atripoides may be confused with A. atripes based on similar body size, black pubescence on the leg of females, the sparsely punctate depressed marginal zone the terga, and S6 lacking a distinct lateral lobe (Gonzalez and Griswold 2013). Female A. atripoides can be differentiated from A. atripes by the less dense tomentum on the fore basitarsus and the thick apical margin of the clypeus in A. atripoides (Gonzalez and Griswold 2013). Male A. atripoides can be differentiated from A. atripes by the presence of a straight, rather than concave, margin of S4, and the lack of an apical emargination on the median lobe on S6 in A. atripoides (Gonzalez and Griswold 2013). Additionally, A. atripoides have a shinier abdominal integument than A. atripes.

Phenology

Anthidium atripoides adults have been recorded in flight from late April to early July, with peak activity occurring from the last half of May to the first half of June (Gonzalez and Griswold 2013).

Host associations

Anthidium atripoides is a generalist that has been observed visiting a variety of species of Asteraceae, Boraginaceae, Brassicaceae, Cactaceae, Cleomaceae, Fabaceae, Lamiaceae, Liliaceae, Malvaceae, Polemoniaceae, Polygonaceae, and Tamaricaceae (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium atripoides occur in the western U.S. in Nevada, Utah, and western Colorado (Gonzalez and Griswold 2013). They are native to the Great Basin shrub-steppe and to shrublands in the Colorado Plateau.


​Distribution map generated by Discover Life -- click on map for details, credits, and terms of use.

<p><em>Anthidium atripoides</em> female face, photo: Chelsey Ritner</p>
Anthidium atripoides female face, photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> female lateral habitus, photo: Chelsey Ritner</p>
Anthidium atripoides female lateral habitus, photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> female abdomen, photo: Chelsey Ritner</p>
Anthidium atripoides female abdomen, photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> female, diagram showing the dorsal view of the sixth tergite (T6), diagram from Gonzalez and Griswold 2013</p>
Anthidium atripoides female, diagram showing the dorsal view of the sixth tergite (T6), diagram from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> male face, photo: Chelsey Ritner</p>
Anthidium atripoides male face, photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> male lateral habitus, photo: Chelsey Ritner</p>
Anthidium atripoides male lateral habitus, photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> male, ventral view of fourth sternum (S4), photo from Gonzalez and Griswold 2013</p>
Anthidium atripoides male, ventral view of fourth sternum (S4), photo from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> male, dorsal view of seventh tergum (T7), photo: Chelsey Ritner</p>
Anthidium atripoides male, dorsal view of seventh tergum (T7), photo: Chelsey Ritner
<p><em>Anthidium atripoides</em> male, diagram showing dorsal view of seventh tergum (T7), diagram from Gonzalez and Griswold 2013</p>
Anthidium atripoides male, diagram showing dorsal view of seventh tergum (T7), diagram from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> male, diagram showing ventral view of sixth sternum (S6), diagram from Gonzalez and Griswold 2013</p>
Anthidium atripoides male, diagram showing ventral view of sixth sternum (S6), diagram from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> male, diagram showing ventral view of seventh sternum (S7), diagram from Gonzalez and Griswold 2013</p>
Anthidium atripoides male, diagram showing ventral view of seventh sternum (S7), diagram from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> male, diagram showing ventral view of eighth sternum (S8), diagram from Gonzalez and Griswold 2013</p>
Anthidium atripoides male, diagram showing ventral view of eighth sternum (S8), diagram from Gonzalez and Griswold 2013
<p><em>Anthidium atripoides</em> dorsal view of male genitalia, photo from Gonzalez and Griswold 2013</p>
Anthidium atripoides dorsal view of male genitalia, photo from Gonzalez and Griswold 2013