Pachyanthidium

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Pachyanthidium Friese, 1905
Subgenera: Ausanthidium, Pachyanthidium, Trichanthidioides, Trichanthidium
Common name: none

Overview

Pachyanthidium are robust bees ranging in body length from 5–12 mm (Michener 2007). Coloration can be entirely black, black integument with yellow maculations, or black head and thorax with a red abdomen (Michener 2007).

Diversity

Pachyanthidium contains 16 species (Michener 2007); none are known to occur in the U.S. or Canada.

Diagnostic characteristics

(modified from Michener 2007)

May be confused with

Some Pachyanthidium may be confused with Euaspis due to the presence of a produced, flat scutellum, two apical spines on the fore and middle tibiae, and similarly colored red abdomens in certain species. Additionally, male Pachyanthidium and Euaspis have a trilobed T7 and a large, rounded gonostylus. Pachyanthidium can be readily distinguished by the lack of juxtantennal carina and a raised median ridge from the frons to the supraclypeal area, which are present in Euaspis (Michener 2007). Female Euaspis can also be differentiated from Pachyanthidium due to the lack of a scopa, a carina on the preoccipital ridge, and a broad-toothed apex of the mandible (Michener 2007).

Known invasives

There are no known invasives.

Host associations

Females have been observed gathering latex from Euphorbia (Michener 2007). Pachyanthidium cordatum has also been observed collecting resin and pollen from Dalechampia capensis (Steiner and Whitehead 1991).

Nesting behavior

Pachyanthidium bicolor constructs cells of resin or plant hairs adjacent to one another on leaves (Michener 1968). Pachyanthidium cordatum has been observed using plant down glued together with resin (Steiner and Whitehead 1991).

Distribution

Pachyanthidium occurs throughout Africa in Namibia, Senegal to Ethiopia, South Africa, Kenya, Saudi Arabia, Ivory Coast to southern Egypt, and Angola, as well as in Asia from India to Yunnan Province, China (Michener 2007).

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

<p><em>Pachyanthidium semiluteum</em> female face, photo: C. Ritner</p>
Pachyanthidium semiluteum female face, photo: C. Ritner
<p><em>Pachyanthidium semiluteum</em> female lateral habitus, photo: C. Ritner</p>
Pachyanthidium semiluteum female lateral habitus, photo: C. Ritner
<p><em>Pachyanthidium semiluteum</em> female abdomen, photo: C. Ritner</p>
Pachyanthidium semiluteum female abdomen, photo: C. Ritner
<p><em>Pachyanthidium katangense</em> female lateral habitus, photo: C. Ritner</p>
Pachyanthidium katangense female lateral habitus, photo: C. Ritner
<p><em>Pachyanthidium bouyssoui</em> female with lamellate preoccipital lobe, photo: C. Ritner</p>
Pachyanthidium bouyssoui female with lamellate preoccipital lobe, photo: C. Ritner
<p><em>Pachyanthidium cordatum</em> male with lamellate omalus, photo: C. Ritner</p>
Pachyanthidium cordatum male with lamellate omalus, photo: C. Ritner
<p><em>Pachyanthidium bicolor</em> male with a scutum that is wider than long, photo: C. Ritner</p>
Pachyanthidium bicolor male with a scutum that is wider than long, photo: C. Ritner
<p><em>Pachyanthidium bouyssoui </em>female scutellum without fovea, photo: C. Ritner</p>
Pachyanthidium bouyssoui female scutellum without fovea, photo: C. Ritner
<p><em>Pachyanthidium bouyssoni </em>female with lamellate scutellum distinctly having over the metanotum, photo: C. Ritner</p>
Pachyanthidium bouyssoni female with lamellate scutellum distinctly having over the metanotum, photo: C. Ritner
<p><em>Pachyanthidium bouyssani</em> female pronotal lobes with lamellate carina, photo: C. Ritner</p>
Pachyanthidium bouyssani female pronotal lobes with lamellate carina, photo: C. Ritner
<p><em>Pachyanthidium cordatum</em> male terga, photo: C. Ritner</p>
Pachyanthidium cordatum male terga, photo: C. Ritner
<p><em>Pachyanthidium ausense</em> male terga, photo: C. Ritner</p>
Pachyanthidium ausense male terga, photo: C. Ritner