Genus: Trichothurgus Moure, 1949
Common name: none
Trichothurgus are generally robust, black bees that lack hair bands on the abdomen. They often have abundant white or yellow hair on the thorax and first few terga with contrasting black hairs on the legs and apical terga, however, they can also be completely black (Michener 2007; Sarzetti et al. 2012). They range in body length from 7–21 mm.
(modified from Michener 2007)
There are no known invasives.
Little is known about the floral associations of Trichothurgus. Trichothurgus bolitophilus visits Amaranthaceae and Asteraceae, while other Trichothurgus, such as T. dubius, have been recorded to visit Cactaceae (Rozen 1973; Sarzetti et al. 2012).
Trichothurgus dubius have been found nesting in dead, standing cacti forming a linear series of unlined cells, as well as in vacant nests of wasps in the subfamily Eumeninae (Rozen 1973). Trichothurgus bolitophilus forms unlined nests with clusters of unpartitioned cells in dried horse manure that may be reused by multiple generations (Sarzetti et al. 2012). Multiple eggs may be oviposited per provision (Sarzetti et al. 2012).
Trichothurgus is restricted to southeastern South America, and generally occurs in xeric habitats (Michener 2007). It ranges from Peru through northern Chile (Tarapacá) and Argentina (Jujuy), south to the San Jorge Gulf region of Patagonia, Argentina (Michener 2007).