Hypanthidium

Taxonomy

Family: Megachilidae
Subfamily: Megachilinae
Tribe: Anthidiini
Genus: Hypanthidium Cockerell, 1904
Subgenera:  Hypanthidium, Tylanthidium
Common name: none

Overview

Hypanthidium often has dark colored integument with yellow maculations on their head, thorax, and abdomen (Michener 2007). In some instances, they can be nearly entirely yellow or reddish-yellow. They have a somewhat robust, parallel-sided body, and range in body length from 7–10.5 mm (Michener 2007).

Diversity

Hypanthidium contains 17 species within two subgenera (Michener 2007); none are known to occur in the U.S. or Canada.

Diagnostic characteristics

(modified from Michener 2007 unless otherwise stated)

May be confused with

Hypanthidium may be confused with Anthodioctes that can have a similar elongate body shape and dark coloration with limited yellow markings; however, they can be differentiated by the lack of arolia and juxtantennal carinae, and lack of a carina between the dorsal and anterior surfaces T1 in Hypanthidium (Michener 2007).

Known invasives

There are no known invasives.

Host associations

Hypanthidium is a specialist and is dependent on Dalechampia (Euphorbiaceae) for pollen and resin for nesting, both of which are collected simultaneously (Armbruster 1984).

Nesting behavior

Hypanthidium build nests out of resin, which is collected from Dalechampia (Euphorbiaceae) at the same time as the pollen (Armbruster 1984). Resin is carried in small globules behind their mandibles (Armbruster and Webster 1981). Hypanthidium likely use resin to seal nesting cavities, line cells, and create nest plugs, which is a behavior commonly seen in megachilid bees (Grigarick and Stange 1968).

Distribution

Hypanthidium are distributed in the Neotropical region, specifically in Sonora, San Luis Potosi, and Yucatan, Mexico; Misiones, Argentina; Paraguay; Bolivia; and Amazonas, Brazil (Michener 1948, 2007).

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

<p><em>Hypanthidium magdalenae </em>male face, photo: C. Ritner</p>
Hypanthidium magdalenae male face, photo: C. Ritner
<p><em>Hypanthidium magdalenae </em>male lateral habitus, photo: C. Ritner</p>
Hypanthidium magdalenae male lateral habitus, photo: C. Ritner
<p><em>Hypanthidium magdalenae</em> male abdomen, photo: C. Ritner</p>
Hypanthidium magdalenae male abdomen, photo: C. Ritner
<p><em>Hypanthidium dressleri</em> female without juxtantennal carina, photo: C. Ritner</p>
Hypanthidium dressleri female without juxtantennal carina, photo: C. Ritner