Osmia mustelina

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Osmiini
Genus: Osmia Panzer, 1806
Subgenus: O. (Osmia) Panzer, 1806
Species: Osmia mustelina Gerstäcker, 1869
Common name: none

Overview

Osmia (Osmia) mustelina are black bees with a metallic blue shimmer (Amiet et al. 2004). Females have pale hair on their face, sometimes with abundant black hair intermixed on the frons and vertex (Peters 1978; Fig. 1). Their thorax has mostly pale hair (Peters 1978; Fig 2). T1T3 can be covered dark brown to white hair, T4 can have white to black hair, and T5T6 usually have entirely brown or black hair (Peters 1978; Fig 3). Male hair is similar to females except that generally males are hairier than females (Peters 1978). Female body length is 12–16 mm, and male body length is 10–12 mm (Amiet et al. 2004). O. mustelina found in Turkey tend to be much brighter than their counterparts (Peters 1978).

Diagnostic characteristics 

(modified from Peters 1978; Banaszak and Romasenko 1998)

  • Mouthparts much smaller than the length of the entire body when extended.
  • Terga without apical hair bands.
  • Female clypeus with somewhat triangular-shaped depressed shiny area at the apical rim and a median longitudinal impunctate line on the disc.
  • Female clypeus without lateral horns.
  • Female with a distinct pit at the bottom of the eye, just behind the malar space.
  • Female mandibles are large, with acute, long lower teeth and wide cutting edge between inner teeth.
  • Female scopa red to reddish-yellow.
  • Male hind basitarsus with red or yellowish hair.
  • Male S6 without gradulus basally.
  • Male gonocoxite almost obtusely angled subapically.

May be confused with 

Osmia mustelina is similar enough to O. emarginata that O. emarginata could possibly be considered a subspecies of O. mustelina (Peters 1978). Female O. mustelina can be easily distinguished by the shape of the apical margin of the clypeus and the presence of an impunctate median ridge on the disc of the clypeus (Banaszak and Romasenko 1998). Males are more difficult to distinguish, in general O. mustelina has less full and paler hair on the thorax, the gonocoxite is obtusely angled subapically, and the ventral ridge less apparent (Peters 1978).

Phenology

O. mustelina adults have been recorded in flight between April and July (Peters 1978).

Host associations 

Osmia mustelina is known to collect pollen from Fabaceae, Cistaceae, Boraginaceae, Plantaginaceae, Rosaceae, and Ranunculaceae (Haider et al. 2013).

Nesting behavior 

Osmia mustelina make nests in preexisting cavities and can be found in cracks and crevices (Amiet et al. 2004). Nest cells are built from leaf material (Amiet et al. 2004).

Distribution

Osmia mustelina is native to Europe; they occur in the warmer areas of Central Europe. Distribution occurs in Italy, Germany, Switzerland, Hungary, Crimea, Greece, and Turkey (Peters 1978).


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

<p><em>Osmia mustelina</em> female face, photo: Chelsey Ritner</p>
Osmia mustelina female face, photo: Chelsey Ritner
<p><em>Osmia mustelina</em> lateral habitus, photo: Chelsey Ritner</p>
Osmia mustelina lateral habitus, photo: Chelsey Ritner
<p><em>Osmia mustelina</em> female abdomen, photo: Chelsey Ritner</p>
Osmia mustelina female abdomen, photo: Chelsey Ritner
<p><em>Osmia mustelina </em>male face, photo: Chelsey Ritner</p>
Osmia mustelina male face, photo: Chelsey Ritner
<p><em>Osmia mustelina</em> male lateral habitus, photo: Chelsey Ritner</p>
Osmia mustelina male lateral habitus, photo: Chelsey Ritner
<p><em>Osmia mustelina</em> male abdomen, photo: Chelsey Ritner</p>
Osmia mustelina male abdomen, photo: Chelsey Ritner
<p><em>Osmia mustelina</em> male, dorsal view of the seventh tergum (T7), photo: Chelsey Ritner</p>
Osmia mustelina male, dorsal view of the seventh tergum (T7), photo: Chelsey Ritner
<p><em>Osmia mustelina </em>male, diagram showing dorsal view of genitalia, diagram modified from Amiet et al. 2004</p>
Osmia mustelina male, diagram showing dorsal view of genitalia, diagram modified from Amiet et al. 2004