Anthidium jocosum

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium jocosum Cresson, 1878
Common name: none

Overview

Anthidium (Anthidium) jocosum are primarily black with yellow or ivory maculations and reddish-brown coloration on the antennal flagellum, clypeal margin, tegula, tibiae, tarsi, abdomen, and apex of the mandible and femora (Gonzalez and Griswold 2013). Females have white pubescence except for yellow to ferruginous hairs on the vertex, scutum, axilla, scutellum, tarsi, and sometimes S6. Females and males have a body length of 6.2–8.8 mm and 8.5–8.8 mm, respectively (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female labrum lacks basal protuberances and has 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 and smooth and shiny between coarse, dense punctures.
  • Female T1T5 distal margins are smooth, shiny, narrow, thick, and carinate.
  • Female T6 depressed apical rim visible across the entire distal margin.
  • Female T6 lateral spine and preapical carina is absent.
  • Male labrum has preapical projections that are larger than those in females.
  • Male S4 with median apical brush of sparse, reddish-brown hair.
  • Male S4 apical margin is straight.
  • Male S6 with blunt lateral lobes.
  • Male S6 median lobe is broadly rounded, and broader than long.
  • Male S7 is pointed apically.
  • Male S8 apical process is narrow, long, and deeply bifid with ventrally bent, pointed lobes.
  • Male T6 lateral spine is straight, and as long as the T7 median spine.
  • Male T7 lateral lobe is subquadrate, and twice as broad basally than the distance between the inner margin and median spine.

May be confused with

Anthidium jocosum may be confused with A. utahense based on the small body size, female basitarsi lacking dense tomentum, female T6 shape, and male T7, genitalia, and sterna shape (Gonzalez and Griswold 2013). Female A. jocosum can be differentiated from A. utahense by the more broadly rounded T6 distal margin with a less depressed apical rim, and clypeus and paraocular area without yellow maculations (Gonzalez and Griswold 2013). Male A. jocosum can also be differentiated from A. utahense by the sparser median apical brush on S4, less acute lateral lobe on S6, and darker, more sclerotized median lobe on S6 (Gonzalez and Griswold 2013).

Phenology

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

Host associations

Anthidium jocosum is a generalist that has been observed visiting a variety of species within Asteraceae, Boraginaceae, Cactaceae, Fabaceae, Lamiaceae, Loasaceae, Malvaceae, Onagraceae, Polemoniaceae, Polygonaceae, Plantaginaceae, Rhamnaceae, and Zygophyllaceae (Gonzalez and Griswold 2013).

Nesting behavior

Nesting behavior is unknown.

Distribution

Anthidium jocosum occur in California, southern Nevada, Arizona, and southwestern New Mexico. One male was also found in Colorado. In Mexico, they are found primarily in Baja California and Sonora. They are found primarily in the Great Basin shrub steppe; Mojave, Sonoran, and Chihuahuan Desert; California coastal sage and chaparral; and Sierra Madre occidental pine-oak forests (Gonzalez and Griswold 2013).


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

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