Anthidium psoraleae

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium psoraleae Robertson, 1902
Common name: none

Overview

Anthidium (Anthidium) psoraleae are dark brown to black with yellow or cream-colored maculations (Gonzalez and Griswold 2013). Females have white pubescence except for the yellow to brown hairs found on the inner tarsi. Females have a body length of 11.5 mm (Gonzalez and Griswold 2013). Males lack dense tomentum on the scape and range in body length from 12–13.8 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female clypeal hairs are simple and apically curved.
  • Female fore and mid basitarsi are covered with sparse tomentum.
  • Female labrum lacks a basal protuberance and has two large pre-apical projections that are curved upwards.
  • Female mandible has 7–8 similarly sized teeth.
  • Female propodeal triangle is shiny and weakly lineolate.
  • Female scape is covered with dense tomentum.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal area is elevated, slightly shiny, slightly imbricate, and smooth between punctures.
  • Female T6 distal margin has a narrow, emarginate median projection, and the lateral margin is slightly convex with small lateral projections.
  • Female T6 is elevated along the midline and has a preapical carina that is slightly crenulate.
  • Male labrum lacks distinct basal protuberances.
  • Male scape lacks dense tomentum.
  • Male S4 median apical brush is indistinct and consists of thick, reddish-brown hairs that can be difficult to see among the other hairs on the sterna.
  • Male S4 apical margin is narrowly concave medially.
  • Male S6 lacks distinct lateral lobes, and the median lobe is large, subrectangular, and broad at the apex, which is notched medially.
  • Male S7 is rounded.
  • Male S8 has a sinuous distal margin.
  • Male T6 lateral spine is curved and is as long as T7 median spine.
  • Male T7 lateral lobe is broad and has an acute inner angle that is 1.5 times broader than the distance between the inner margin and median spine.

May be confused with

Anthidium psoraleae may be confused with A. clypeodentatum due to the presence of short, white tomentum on the antennal scape in females, the medial projection on T6 in females, and a broad, lateral lobe on T7 with a sharp, angled inner margin in males (Gonzalez and Griswold 2013). Female A. psoraleae can be differentiated from A. clypeodentatum by the lack of a dentate or tuberculate distal margin and the presence of small lateral spines on T6 (Gonzalez and Griswold 2013). Male A. psoraleae can be differentiated from A. clypeodentatum by the subrectangular median lobe of S6 (Gonzalez and Griswold 2013).

Phenology

Anthidium psoraleae adults have been recorded in flight from June to July (Gonzalez and Griswold 2013).

Host associations

Anthidium psoraleae is a generalist that has been observed visiting a variety of species within Campanulaceae, Fabaceae, and Verbenaceae (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium psoraleae occur from Mexico to Southern Canada. Most specimens have been collected in the central U.S. from Colorado to Indiana but specimens have been reported as far east as Massachusetts (Gonzalez and Griswold 2013; Discover Life 2018). They are primarily found in forests and grasslands (Gonzalez and Griswold 2013).


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

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