Family: Megachilidae
Subfamily: Megachilinae
Tribe: Megachilini
Genus: Thaumatosoma Smith, 1865
Common name: none


Thaumatosoma are robust bees that range in body length from 9–12 mm (Michener 2007). Thaumatosoma was elevated from a subgenus of Megachile to genus status by Gonzalez et al. (2019).

Diagnostic characteristics

(modified from King and Exley 1985; Michener 2007)

  • Female mandible is long and bidentate.
  • Female T6 with round basolateral shoulders and concave lateral margins.
  • Male clypeus with long, coarse bristles medially.
  • Male flagellum attenuate.
  • Male antenna modified; the scape is distinctly swollen and the last two flagellomeres are flattened and strongly expanded.
  • Male hind tibia with one tibial spur instead of two.

May be confused with

Thaumatosoma may be confused with bees within the genus Hackeriapis due to the shared characteristics of postgradular grooves on T2T3 and expanded apical flagellar segments in some Hackeriapis males (Michener 2007). Female Thaumatosoma can be differentiated from Hackeriapis by their bidentate mandible and T6 with round basolateral shoulders (Michener 2007). Male Thaumatosoma can be differentiated from Hackeriapis by the uniquely swollen scape, expanded apical flagella, and long, coarse bristles in the center of the clypeus (Michener 2007).

Host associations

Thaumatosoma are known to visit flowers of plants in the families Goodeniaceae and Myoporaceae (King and Exley 1985).

Nesting behavior

Nesting behavior is unknown.


Thaumatosoma consists of two species (Michener 2007); none are known to occur in the U.S. or Canada.

Known invasives

There are no known invasives. 


Thaumatosoma occurs throughout the southern third of Australia. They are found predominantly along the western coast as well as inland areas with desert-like conditions (Michener 2007).

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

Specimens of this taxon not available for imaging.