Anthidium collectum

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium collectum Huard, 1896
Common name: none

Overview

Anthidium (Anthidium) collectum are dark brown to black with yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence, except for the yellow to brown hairs found on the vertex, scutum, axilla, scutellum, inner tarsi, terga, and S6. Females range in body length from 8.5–9.7 mm (Gonzalez and Griswold 2013). Males have pale pubescence on the vertex, scutum, scutellum, and terga. Males range in body length from 10.0–13.8 mm (Gonzalez and Griswold 2013).

Diagnostic characteristics

(modified from Gonzalez and Griswold 2013)

  • Female clypeus with a thin, slightly wavy distal margin.
  • Female labrum has weak, low basal protuberances, and long, curved preapical projections.
  • Female mandible has 5–6 teeth.
  • Female propodeal triangle is slightly lineolate, and is usually smooth and shiny.
  • Female hind tibia without anterior carina.
  • Female T1T5 discal area punctures are 1-2 puncture widths apart.
  • Female T1T5 depressed marginal zone has dense punctures, with almost no space between them medially.
  • Female T6 lacks a lateral angle and a preapical carina.
  • Male labrum preapical projections are longer than that in females.
  • Male T6 lateral spine is straight and as long or longer than the T7 median spine.
  • Male T7 lateral lobe is rounded apically.
  • Male S4 median apical brush is broad with dense, short, black hairs.
  • Male S6 basal margin is slightly convex.
  • Male S6 lateral lobes are small and angulate.
  • Male S6 median lobe is apically notched.
  • Male S7 is apically truncate.
  • Male S8 apical process tapers ventrally and is bent at a 100° angle in profile.

May be confused with

Female A. collectum may be confused with A. labergei due to the basitarsi covered with dense tomentum, white sternal scopa, and dull terga with dense punctation (Gonzalez and Griswold 2013). Female A. collectum and A. labergei can be differentiated from one another by the presence of yellow maculations on the outer surface of the mandible, a more convex clypeus in profile with a wavy distal margin, and T6 with a depressed apical rim that is visible along three-quarters of the distal margin (Gonzalez and Griswold 2013). Male A. collectum may be confused with A. schwarzi due to the narrowly rounded lateral lobe of T7, S4 with a similar median apical brush of black hairs, and S6 with a median, small, apically notched median lobe (Gonzalez and Griswold 2013). Male A. collectum can be differentiated from A. schwarzi by the narrower lateral lobe on T7, a less concave distal margin on S4, and shorter hairs on the S4 apical brush (Gonzalez and Griswold 2013).

Phenology

Anthidium collectum adults have been recorded in flight from March to early August, with peak activity occurring from April to June (Gonzalez and Griswold 2013).

Host associations

Anthidium collectum are generalists that have been observed visiting a variety of species within Adoxaceae, Asteraceae, Boraginaceae, Fabaceae, Lamiaceae, Onagraceae, Phrymaceae, Polemoniaceae, Salicaceae, Solanaceae, and Violaceae (Gonzalez and Griswold 2013). However, they have a strong preference for Lotus (Fabaceae) and Phacelia (Boraginaceae) (Gonzalez and Griswold 2013).

Nesting behavior

Anthidium collectum nest in preexisting cavities in hollow stems or in abandoned ground nests of other bees (Gonzalez and Griswold 2013). Nest plugs are comprised of trichomes from Artemisia tridentata (Asteraceae) and pebbles (Hicks 1929; Ferguson 1962).

Distribution

Anthidium collectum occur in primarily in California but a small number of specimens have been reported from Oregon, Washington, Idaho, and Kansas (Gonzalez and Griswold 2013). They are found at lower elevations in grasslands, chaparral, woodlands, and occasionally in coastal and forest landscapes (Gonzalez and Griswold 2013).


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

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