Anthidium platyfrons

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium platyfrons Gonzalez and Griswold, 1879
Common name: none

Overview

Anthidium (Anthidium) platyfrons are dark brown to black, with ferruginous coloration on the inner fore and middle femora and tarsi, and yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence except for some yellow hairs on the vertex, scutum, axilla, scutellum, inner tarsi, and abdomen. The clypeus, supraclypeal area, and frons are covered in apically hooked or wavy hairs. Females have a body length of 6.3 mm, and males have a body length of 8.8 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female labrum lacks basal protuberances and has two large preapical projections that curve upwards.
  • Female mandible has five teeth.
  • Female propodeal triangle is shiny and smooth.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal areas are weakly elevated with shiny smooth areas between punctures.
  • Female T1T5 depressed marginal zones are densely punctate.
  • Female T1T5 apical impunctate zones are narrow.
  • Female T6 is convex and lacks a distinct lateral angle.
  • Female T6 preapical carina is absent.
  • Male S4 median apical brush with long black hairs on one-third of the weakly convex apical margin.
  • Male S7 is apically pointed.
  • Male S8 has a broad, bifid apical process and pointed lobes on the distal margin.
  • Male T6 lateral spine is straight and about as long as T7 median spine.
  • Male T7 lateral lobe is apically rounded and 1.5 times broader than the distance between the inner margin and median spine.

May be confused with

Female Anthidium platyfrons may be confused with A. tenuiflorae due to the absence of anterior hind tibial carina and white sternal scopa (Gonzalez and Griswold 2013). Males are also similar in the rounded lateral lobe of T7, dense median apical brush of long hairs on S4, and distinct lateral and median lobes on S6. Female A. platyfrons can be differentiated from A. tenuiflorae by their small body size and clypeus with apically wavy hairs (Gonzalez and Griswold 2013). Male A. platyfrons can be differentiated from A. tenuiflorae by the straight lateral lobe on S6 and short, broad apical process on S8 (Gonzalez and Griswold 2013).

Phenology

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

Host associations

Floral associations are unknown.

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium platyfrons occur in two areas southwest of Phoenix, Arizona (Gonzalez and Griswold 2013). They are found primarily in areas undergoing agricultural cultivation. They are rare in their endemic location in the Sonoran Desert (Gonzalez and Griswold 2013).


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

<p><em>Anthidium platyfrons</em> female face, photo: Chelsey Ritner</p>
Anthidium platyfrons female face, photo: Chelsey Ritner
<p><em>Anthidium platyfrons</em> female lateral habitus, photo: Chelsey Ritner</p>
Anthidium platyfrons female lateral habitus, photo: Chelsey Ritner
<p><em>Anthidium platyfrons </em>female abdomen, photo: Chelsey Ritner</p>
Anthidium platyfrons female abdomen, photo: Chelsey Ritner
<p><em>Anthidium platyfrons </em>male face, photo: Chelsey Ritner</p>
Anthidium platyfrons male face, photo: Chelsey Ritner
<p><em>Anthidium platyfrons </em>male lateral habitus, photo: Chelsey Ritner</p>
Anthidium platyfrons male lateral habitus, photo: Chelsey Ritner
<p><em>Anthidium platyfrons </em>male abdomen, photo: Chelsey Ritner</p>
Anthidium platyfrons male abdomen, photo: Chelsey Ritner
<p><em>Anthidium platyfrons </em>male, dorsal view of seventh tergum (T7), photo: Chelsey Ritner</p>
Anthidium platyfrons male, dorsal view of seventh tergum (T7), photo: Chelsey Ritner