Anthidium duomarginatum

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium duomarginatum Gonzalez and Griswold, 2013
Common name: none

Overview

Anthidium (Anthidium) duomarginatum are black with dark brown antennae, light brown distitarsi, and yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence, except for brown hairs on the sternal scopa and ferruginous hairs found on the inner tarsi. Some A. duomarginatum have ferruginous hairs on the vertex, scutum, axilla, and scutellum. Females have a body length of 11.1 mm (Gonzalez and Griswold 2013). Males have white pubescence throughout their body, and range in body length from 10–13.8 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female labrum has large preapical projections that point upwards, and lacks basal protuberance.
  • Female mandible has 5–6 teeth.
  • Female propodeal triangle is weakly lineolate, smooth, and shiny.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal areas distinctly elevated with apical margins distinctly thickened.
  • Female T6 preapical carina is absent.
  • Male labrum with preapical projections that are larger than those in females.
  • Male S4 with median apical brush of dense black or reddish-brown hairs.
  • Male S4 apical margin is slightly concave medially.
  • Male S6 with acute lateral lobes that have concave outer edges, and a median lobe that tapers and is rounded apically.
  • Male S8 has a broad, bifid apical process.
  • Male T6 lateral spine is straight, and as long as the T7 median spine.
  • Male T7 lateral lobe is apically rounded.

May be confused with

Anthidium duomarginatum can be differentiated from all other Anthidium by the presence of shiny, elevated discal areas on T1T5 and thick, carinate apical margins (Gonzalez and Griswold 2013). Some A. atrifrons species with pale hairs and strong yellow markings appear similar to A. duomarginatum; however, A. duomarginatum can be differentiated by the less dense tomentum on the fore and mid basitarsi (Gonzalez and Griswold 2013).

Phenology

Anthidium duomarginatum adults have been recorded in flight from May to mid-August, with peak activity occurring in June (Gonzalez and Griswold 2013).

Host associations

Anthidium duomarginatum is a generalist that has been observed visiting a variety of species within Asteraceae, Boraginaceae, Caryophyllaceae, Cleomaceae, Fabaceae, Geraniaceae, Iridaceae, Lamiaceae, Liliaceae, and Plantaginaceae (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium duomarginatum occur throughout southern Utah, northern Arizona, and northern New Mexico. They are found primarily in the Wasatch montane forests, the Arizona mountain forests, and in the mountains and shrublands along the Colorado Plateau (Gonzalez and Griswold 2013).


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

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