Anthidiellum Cockerell, 1904

Nalinrachatakan, Pakorn, Ascher, John S., Kasparek, Max, Traiyasut, Prapun, Thanoosing, Chawatat & Warrit, Natapot, 2023, A review of the anthidiine bees (Apoidea, Megachilidae) in Thailand, ZooKeys 1186, pp. 235-284 : 235

Anthidiellum Cockerell, 1904

Anthidium (Anthidiellum) Cockerell, 1904: 3. Type species: Trachusa strigata Panzer, 1805, by original designation.

Note.

Anthidiellum is a small-robust genus that has an arcuate subantennal suture (Fig. 2C ), carinated omaulus (see Fig. 2A ), open scutoscutellar suture (see Fig. 2B ), and presence of a propodeal fovea behind the spiracle. Two distinct subgenera were recognized in Thailand: Pycnanthidium Krombein, 1951, with a generally black-yellow integument and a prominent frontal carina on T1; and Ranthidiellum Pasteels, 1969, which is slightly larger in comparison, with a general black to reddish brown integument (Fig. 4A, B ), and with a general appearance similar to a stingless bee.

Figures

Figure 2. Female of Anthidiellum latipes (Bingham, 1897) from Phang Nga, Thailand (BSRU-AB- 0162) (A-E), and the female holotype of A. latipes from Yangon, Myanmar (NHMUK 014026066: picture modified from NHMUK data portal) (F) A lateral habitus B dorsal habitus C face D lateral angle showing the omaulus and hind legs E female wandering on the marigold flower (Tagetes erecta L.), photographed by Andaman Kaosung F lateral habitus. Scale bars: 2 mm (A, B, D); 1 mm (C, F).

Figure 4. Comparing specimens of Anthidiellum (Ranthidiellum) recently collected from Thailand, and its cleptoparasite A female Anthidiellum ignotum Engel, 2009 (BSRU-AA- 1249) B female paratype of Anthidiellum phuchongense Nalinrachatakan & Warrit, 2021 (BSRU-AB- 0159) C male paratype of cleptoparasite Stelis flavofuscinular Nalinrachatakan & Warrit, 2021 (BSRU-AB- 0156). Scale bar: 2 mm.