Stenoheriades

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Osmiini
Genus: Stenoheriades Tkalců, 1984
Subgenera: none
Common name: none

Overview

Stenoheriades are coarsely punctate, black bees with white hair bands on their terga and a slender, elongate build. They range in body length from 5–7 mm (Michener 2007).

Diversity

Stenoheriades contains 11 described species and 6 undescribed species worldwide; none are known to occur in the U.S. or Canada (Michener 2007; Müller and Trunz 2014; Griswold 2018;). Despite the small number of species, Stenoheriades is very diverse in form; there are four species groups that are as distinct as subgenera in other osmiine genera (Griswold 1985).

Diagnostic characteristics

(modified from Michener 2007)

May be confused with

Stenoheriades may be confused with Heriades due to a similar elongate build and coloration. However, Stenoheriades males lack the dentate preapical ridge on T6, and T7 is not visible. Female Stenoheriades have a shorter proboscis, which is not produced beyond the fossa (Michener 2007).

Known invasives

There are no known invasives.

Host associations

Stenoheriades appear to exhibit varying levels of host specialization on Asteraceae (Müller and Trunz 2014). Some species are narrowly specialized on Anthemis, such as S. asiatica and S. coelostoma, whereas others (S. eingeddicus) visit Aster (Müller and Trunz 2014). Some species appear to be less specialized, such as S. marocanna which more broadly visits Cichoriodea (Müller and Trunz 2014).

Nesting behavior

Stenoheriades are solitary nesting bees, but little is known about their nesting habits. It is suspected that they build nests in wood-boring insect burrows in dead wood, and cell linings and partitions may be made of resin (Müller and Trunz 2014).

Distribution

Stenoheriades are widespread in the Afrotropical and western Palearctic regions (Michener 2007). Although rare, their range is broad, encompassing southern Europe in southern Spain and Sicily, southeastern Europe in Bulgaria and Croatia, Turkey, the Arabian Peninsula, Morocco, sub-Saharan Africa to South Africa, and Madagascar (Michener 2007). One species is known to have a disjunct distribution and is found in southern India (Griswold 2018). Six undescribed species occur in the Afrotropical region (Michener 2007).

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

<p><em>Stenoheriades eingeddicus </em>male face, photo: C. Ritner</p>
Stenoheriades eingeddicus male face, photo: C. Ritner
<p><em>Stenoheriades eingeddicus</em> male lateral habitus, photo: C. Ritner</p>
Stenoheriades eingeddicus male lateral habitus, photo: C. Ritner
<p><em>Stenoheriades eingeddicus</em> male abdomen, photo: T. Brady</p>
Stenoheriades eingeddicus male abdomen, photo: T. Brady
<p><em>Stenoheriades</em> sp. labrum, photo: C. Ritner</p>
Stenoheriades sp. labrum, photo: C. Ritner
<p><em>Stenoheriades mackiae</em> male T6 with denticulate preapical ridge, photo: C. Ritner</p>
Stenoheriades mackiae male T6 with denticulate preapical ridge, photo: C. Ritner