Anthidium labergei

Taxonomy

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

Overview

Anthidium (Anthidium) labergei are dark brown to black with yellow maculations (Gonzalez and Griswold 2013). The outer surface of the mandible, paraocular area, and clypeus are black with dispersed yellow spots. Females have white pubescence, except for the yellow hairs found on the vertex, scutum, axilla, scutellum, and inner tarsi. Females range in body length from 6.5–10.3 mm, and males range in body length from 9.2–10.5 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female labrum lacks basal protuberances and has large preapical projections that are curved upwards.
  • Female mandible has five teeth.
  • Female propodeal triangle is shiny and finely imbricate to lineolate.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal areas are elevated, slightly shiny, and weakly imbricate between the punctures.
  • Female T6 is straight in profile with a slightly swollen disc and lacks lateral spines.
  • Male labrum preapical projections are larger than that in females.
  • Male S4 with median apical brush of short, dark brown to black hairs.
  • Male S4 apical margin is concave medially.
  • Male S6 lateral lobe is absent.
  • Male S6 distal margin is laterally thick with a small, apically notched median lobe.
  • Male S7 is notched on the apical margin.
  • Male S8 apical margin is pointed and is hooked in profile.
  • Male T6 lateral spine is slightly curved and as long as the T7 median spine.
  • Male T7 lateral lobes are apically rounded.

May be confused with

Female A. labergei may be confused with A. collectum due to the lack of an anterior carina on the hind tibia, presence of basitarsi covered with dense tomentum, white sternal scopa, and dull terga with somewhat dense punctation (Gonzalez and Griswold 2013). Female A. labergei and A. collectum can be differentiated from one another by the paraocular area with reduced or absent maculations, and overall finer punctations on the terga in A. labergei (Gonzalez and Griswold 2013). Male A. labergei may be confused with A. palmarum due to the shape of S6 and shape of the apical process on S8 (Gonzalez and Griswold 2013). Male A. labergei can be differentiated from A. palmarum by the broad, rounded shape of the lateral lobe on T7, S4 with median apical margin more concave, S7 hemisternite with a notched distal margin, and a hooked apical process on S8 (Gonzalez and Griswold 2013).

Phenology

Anthidium labergei adults have been recorded in flight from April to early May (Gonzalez and Griswold 2013).

Host associations

Anthidium labergei is a generalist that has been observed visiting a variety of species within Asteraceae, Boraginaceae, Brassicaceae, and Malvaceae (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium labergei occur in the U.S. throughout southern Arizona, southern New Mexico, and western Texas (Gonzalez and Griswold 2013). In Mexico, they are found in northern Sonora where their distribution is restricted to the Chihuahuan and Sonoran Desert ecoregions (Gonzalez and Griswold 2013).


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

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