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 distitarsidistitarsi:
the fifth tarsal segment, furthest from the body
, and yellow maculations (Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.). Females have white pubescencepubescence:
short, fine hair
, except for brown hairs on the sternal scopascopa:
modified hairs for carrying pollen; often branched and dense hairs on the hind-leg, or on the ventral surface of the abdomen in Megachilidae
and ferruginousferruginous:
rust-colored
hairs found on the inner tarsitarsi:
the group of segments at the end of the leg following the tibia
. Some A. duomarginatum have ferruginousferruginous:
rust-colored
hairs on the vertexvertex:
the area between the ocelli and the back of the head
, scutumscutum:
the large segment on top of the thorax located between the wings and behind the head
, axillaaxilla:
the triangular or rounded point on the thorax where thoracic muscles meet the forewing of an insect
, and scutellumscutellum:
shield shaped plate behind scutum
. Females have a body length of 11.1 mm (Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.). Males have white pubescencepubescence:
short, fine hair
throughout their body, and range in body length from 10–13.8 mm (Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.)

• Female labrumlabrum:
  part of the head abutting the clypeus, folds down in front of the mouthparts
  has large preapicalpreapical:
  referring to a section of a bee that is physically found just before the outermost (or apical) end of the section or segment
  projections that point upwards, and lacks basalbasal:
  originating at the foundation of a structure
  protuberance.
• Female mandiblemandible:
  bee teeth, so to speak, usually crossed and folded in front of the mouth
  has 5–6 teeth.
• Female propodealpropodeal:
  the last segment of the thorax
  triangle is weakly lineolatelineolate:
  marked with fine lines
  , smooth, and shiny.
• Female hind tibiatibia:
  the segment of the leg, between the femur and the tarsus
  without anterioranterior:
  toward the head or on the head side of a segment being described
  carina.
• Female T1–T5 discal areas distinctly elevated with apicalapical:
  near or at the apex or end of any structure
  margins distinctly thickened.
• Female T6T6:
  the segments on the top side of the abdomen, often abbreviated when referring to a specific segment to T1, T2, T3, T4, T5, T6, or T7
  preapicalpreapical:
  referring to a section of a bee that is physically found just before the outermost (or apical) end of the section or segment
  carinacarina:
  a clearly defined ridge or keel, not necessarily high or acute; usually appears on bees as simply a raised line
  is absent.
• Male labrumlabrum:
  part of the head abutting the clypeus, folds down in front of the mouthparts
  with preapicalpreapical:
  referring to a section of a bee that is physically found just before the outermost (or apical) end of the section or segment
  projections that are larger than those in females.
• Male S4S4:
  the plates on the underside of the abdomen, often abbreviated when referring to a specific segment to S1, S2, S3, S4, S5, S6, S7, or S8
  with median apicalapical:
  near or at the apex or end of any structure
  brush of dense black or reddish-brown hairs.
• Male S4S4:
  the plates on the underside of the abdomen, often abbreviated when referring to a specific segment to S1, S2, S3, S4, S5, S6, S7, or S8
  apicalapical:
  near or at the apex or end of any structure
  margin is slightly concave medially.
• Male S6S6:
  the plates on the underside of the abdomen, often abbreviated when referring to a specific segment to S1, S2, S3, S4, S5, S6, S7, or S8
  with acute laterallateral:
  relating, pertaining, or attached to the side
  lobes that have concave outer edges, and a median lobe that tapers and is rounded apicallyapically:
  near or at the apex or end of any structure
  .
• Male S8S8:
  the plates on the underside of the abdomen, often abbreviated when referring to a specific segment to S1, S2, S3, S4, S5, S6, S7, or S8
  has a broad, bifidbifid:
  divided into two branches; forked
  apicalapical:
  near or at the apex or end of any structure
  process.
• Male T6T6:
  the segments on the top side of the abdomen, often abbreviated when referring to a specific segment to T1, T2, T3, T4, T5, T6, or T7
  laterallateral:
  relating, pertaining, or attached to the side
  spine is straight, and as long as the T7T7:
  the segments on the top side of the abdomen, often abbreviated when referring to a specific segment to T1, T2, T3, T4, T5, T6, or T7
  median spine.
• Male T7T7:
  the segments on the top side of the abdomen, often abbreviated when referring to a specific segment to T1, T2, T3, T4, T5, T6, or T7
  laterallateral:
  relating, pertaining, or attached to the side
  lobe is apicallyapically:
  near or at the apex or end of any structure
  rounded.

May be confused with

Anthidium duomarginatum can be differentiated from all other Anthidium by the presence of shiny, elevated discal areas on T1–T5 and thick, carinatecarinate:
having keels or carinae
apicalapical:
near or at the apex or end of any structure
margins (Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.). 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 tomentumtomentum:
a form of pubescence composed of short matted, woolly hair
on the fore and mid basitarsibasitarsi:
the segment of the tarsus that is the nearest to the body of the bee, usually the largest of all the tarsal segments
(Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.).

Phenology

Anthidium duomarginatum adults have been recorded in flight from May to mid-August, with peak activity occurring in June (Gonzalez and Griswold 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.).

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 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.).

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 2013Gonzalez and Griswold 2013:
Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal 168: 221ndash;425.).

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References

Gonzalez, V.H. and T.L. Griswold. 2013. Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography. Zoological Journal of the Linnean Society 168: 221-425.