Eoanthidium Popov, 1950

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

Eoanthidium Popov, 1950

Dianthidium (Eoanthidium) Popov, 1950: 316. Type species: Anthidium insulare Morawitz, 1873, by original designation.

Eoanthidium (Eoanthidiellum) Pasteels, 1969: 51. Type species: Anthidium elongatum Friese, 1897 = Anthidium clypeare Morawitz, 1873, by original designation.

Note.

An old-world genus which is mostly discernable from other genera by its more slender, striking black-yellow body, with a distinct juxta-antennal carina (Fig. 6B ), rounded preoccipital ridge, carinated omaulus (see Fig. 6A, C ), and rounded scutellum (Fig. 6B ). Male sterna lack apical comb, penis valve enlarged, and pointed apically. The genus comprises four subgenera with 21 species in the Afrotropical, Palaearctic and Indo-Malayan regions ( Kasparek and Griswold 2021). This work focuses on the subgenus Anthidium Hemidiellum which has only one species to date. The bee subgenus Anthidium Hemidiellum has a relatively small body length (~ 6-7 mm; Fig. 6 ) compared to its congeners, with the combination of characters as follow: omaular carina complete; distinct juxta-antennal carina; subantennal suture almost straight; upper margin of keirotrichiate area of hind tibia curved, not carinated; T4-T6 laterally with small tubercles in both sexes; arolia present. In addition to the type species, Gupta (1993) previously assigned Eo. punjabense Gupta & Sharma, 1993 to the subgenus Eoanthidium Hemidiellum (see also Kasparek and Griswold 2021).

Figures

Figure 6. Eoanthidium (Hemidiellum) riparium (Cockerell, 1929). Female holotype of Dianthidium riparium Cockerell, 1929 (syn.) from Thailand (A, B). Male from Thailand (BSRU-AB- 4360) (C, D). Female from Laos (BMNH-ENT- 2017 - 196 (ACQ )) (E), Female from Laos (BSRU-AA- 1224) (F), male from Laos (BSRU-AA- 1236) (G-K), and male from Thailand (BSRU-AB- 4358) (L) H-J male genitalia in dorsal, ventral, and lateral view K male S 8 L apical sterna of male in ventral view. Scale bars: 2 mm (D); 1 mm (A-C, E-G); 0.5 mm (H-L).