Anthidium rodecki

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium rodecki Schwarz, 1934
Common name: none

Overview

Anthidium (Anthidium) rodecki are black, with light brown to ferruginous coloration on the tarsi, sterna, and tergal distal margins, and yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence except for light brown to ferruginous hairs on the inner tarsi. The outer fore and mid basitarsi are covered by tomentum. Females range in body length from 7.4–10.8 mm, and males range in length from 8.2–12.3 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female clypeus is weakly convex with a thin, straight distal margin that has sublateral tubercles.
  • Female fore basitarsus with a sparse fringe of long hairs along the posterior margin.
  • Female labrum has two small preapical projections and lacks basal protuberances.
  • Female mandible has 6–7 teeth.
  • Female propodeal triangle is dull or weakly shiny and finely imbricate.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal areas are weakly elevated with dull or weakly shiny, finely imbricate areas between fine, sparse punctures.
  • Female T1T5 depressed marginal zones are finely punctate.
  • Female T1T5 apical margins are dull or weakly shiny.
  • Female T6 with median apical emargination small or absent.
  • Male labrum preapical projections are absent.
  • Male S4 with median apical brush of dense, reddish-brown hairs.
  • Male S6 with broad, ventrally bent lateral lobes and a broad median lobe that has a notched distal margin.
  • Male S7 is apically truncate.
  • Male S8 distal margin has a distinct, long, rectangular apical process.
  • Male T6 lateral spine is straight and about as long as T7 median spine.
  • Male T7 lateral lobe is apically rounded and twice as broad as the distance between the inner margin and median spine.

May be confused with

Anthidium rodecki may be confused with A. paroselae and A. sonorense due to the combination of white pubescence, a weakly convex clypeus in profile with a straight apical margin, dull or weakly shiny terga with complete bands of yellow maculations, and tergal discs with fine and sparse punctures (Gonzalez and Griswold 2013). Female A. rodecki can be differentiated from A. paroselae and A. sonorense by the fringe of long hairs on the basitarsus, the absence of an anterior carina on the hind tibia, and T6 with a broad depressed apical rim. Male A. rodecki can be differentiated from A. paroselae and A. sonorense by the presence of a broad, rounded lateral lobe on T7, median apical brush of dense, reddish-brown hairs on S4, and the shape of S6 and S8 (Gonzalez and Griswold 2013).

Phenology

Anthidium rodecki adults have been recorded in flight from May to early September, with peak activity occurring from June to the first half of July (Gonzalez and Griswold 2013).

Host associations

Anthidium rodecki has been observed visiting Tetradymia tetramers (Asteraceae), and Psoralidium lanceolatum and P. polydenius (Fabaceae) (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium rodecki occur in the U.S. in Nevada, Utah, Idaho, Colorado, and Wyoming. They are restricted to sand dunes within the Great Basin, Colorado Plateau, Red Desert, San Luis Valley, and the western edge of the Great Plains (Gonzalez and Griswold 2013).


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

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