Pachyanthidium Friese Anthidium (Pachyanthidium) Friese 1905: 66 –75. Type species: Anthidium bicolor Lepeletier, designated by Cockerell, 1920. Pachyanthidium Friese: Cockerell 1930: 45. Pachyanthidium (Pachyanthidium) Friese: Pasteels 1984: 4 –153. Pachyanthidium (Trichanthidium) Cockerell, 1930: 53. Type species: Pachyanthidium occipitale Cockerell, monobasic. Ausanthidium Pasteels, 1969: 10 –61. Type species Anthidiellum ausense Mavromoustakis, 1934, by original designation. Pachyanthidium (Ausanthidium): Michener and Griswold 1994: 301 –319. Pachyanthidium (Trichanthidiodes) Michener and Griswold, 1994: 301 –319. Type species: Pachyanthidium semiluteum Pasteels, 1981, by original designation. Diagnosis. Diagnostic features of Pachyanthidium are the lamellate omaulus; carinate to lamellate preoccipital margin; gently outcurved subantennal suture; short, stout multi-dentate mandible; closed scutal-scutellar suture; and lamellate scutellum that extends posteriorly beyond the metanotum. Subgenera can be recognized as follows: Ausanthidium has naked eyes and arolia present on all legs; it is monotypic and Afrotropical. Trichanthidium has hairy eyes, no arolia, lateral spines on T3–T5 and a ventral, longitudinal carina on the mid femora. It comprises four Afrotropical species. Trichanthidiodes also has hairy eyes and no arolia, but does not have spines on T3–T5 or a carina on the mid femora. It is monotypic and Afrotropical. Pachyanthidium s. str. has eyes that lack hairs and no arolia. There are ten Afrotropical species.

Published as part of Eardley, Connal & Griswold, Terry, 2017, Taxonomic revision of the Afrotropical species of Pachyanthidium Friese (Hymenoptera: Megachilidae: Anthidiini), pp. 401-453 in Zootaxa 4237 (3) on page 403, DOI: 10.11646/zootaxa.4237.3.1, http://zenodo.org/record/344704