Anthidiellum (Pycnanthidium) carinatum (Wu, 1962)

Tran, Ngat Thi, Engel, Michael S., Nguyen, Cuong Quang, Tran, Duong Dinh & Nguyen, Lien Thi Phuong, 2023, The bee genus Anthidiellum in Vietnam: descriptions of five new species and the first male of Anthidiellum coronum (Hymenoptera, Megachilidae), ZooKeys 1144, pp. 171-196 : 171

Anthidiellum (Pycnanthidium) carinatum (Wu, 1962)

Figs 3A-G , 4A-F

Paraanthidium carinatum Wu, 1962: 165 [holotype ♂, paratype ♀]. Wu et al. 1988: 61.

Trachusa (Paraanthidium) carinatum (Wu): Wu 2006: 181.

Anthidiellum (Pycnanthidium) carinatum (Wu): Niu et al. 2016: 337.

Material examined.

Vietnam: 2♀♀, Son La, Moc Chau, Nam Kham , alt. 630 m, 22.vi.2020 [22 June 2020], Lien Thi Phuong Nguyen, Cuong Quang Nguyen, Ngat Thi Tran, Thai Van Mai leg. [1♀ in IEBR, 1♀ in AMNH]; 1♀; Son La, Moc Chau , 27.vi.2022, Lien Thi Phuong Nguyen, Lam Xuan Truong, Cuong Quang Nguyen, Ngat Thi Tran leg. ,; 1♀, Vinh Phuc, Me Linh station , 12.vi.2018 [12 June 2018], Phong Huy Pham leg. ; 3♂♂, Kon Tum, Sa Thay, Chu Mom Ray NP, 14°47'24.5"N, 107°59'46.5"E, alt. 729 m, 25.iv.2016 [25 April 2016], Lien Thi Phuong Nguyen, Dai Dac Nguyen, Ngat Thi Tran leg. [IEBR]; 6♂♂, Kon Tum, Sa Thay, Chu Mom Ray NP, Ro Koi RS, 14°27'25"N, 107°36'22"E, alt. 267 m, 25.iv.2022 [25 June 2022], Lien Thi Phuong Nguyen, Ngat Thi Tran leg. [4♂♂ in IEBR, 2♂♂ in AMNH]; 3♀♀, Gia Lai, Mang Yang, Ayun, Kon Ka Kinh NP, 14°13'18"N, 108°19'02"E, alt. 907 m, 26.iii.2022 [26 March 2022], Lien Thi Phuong Nguyen, Ngat Thi Tran, Cuong Quang Nguyen leg. ; 1♀, Gia Lai, Mang Yang, Ayun, Kon Ka Kinh NP, 14°12'11"N, 108°18'58"E, alt. 834 m, 25.iii.2022 [25 March 2022], Lien Thi Phuong Nguyen, Ngat Thi Tran, Cuong Quang Nguyen leg. ; 1♂, Dak Lak, Krong Bong, Krong Kmar, Chu Yang Sin NP, 12°28'46.4"N, 108°13'46.4"E, alt. 739 m, 2.v.2016 [2 May 2016], Lien Thi Phuong Nguyen, Dai Dac Nguyen, Ngat Thi Tran leg. [IEBR].

Remarks.

This species can be separated from the similar species A. smithii (Ritsema) by the following combination of traits: punctures of mesoscutum mesad parapsidal line dense but not contiguous; axilla laterally not reaching tangent of lateral margin of mesoscutum; and clypeus more densely, finely punctate, and posterior margin of gena not as strongly carinate posteriorly.

Nesting biology.

A nest was found in an unused wooden plank in a warehouse in Son La Province. The entrance hole of the nest was oval-shaped, with a length and a width of about 4 mm and 3 mm, respectively (Fig. 3G ). A female was observed and collected when flying out from the nest.

Figures

Figure 3. Anthidiellum (Pycnanthidium) carinatum (Wu, 1962), female A lateral habitus B dorsal-posterior habitus C facial view D mesosoma in dorsal view E mesosoma in lateral view, red arrow indicating omaular carina F prolateral surfaces of metatibia and metatarsus, with red arrows indicating longitudinal carinae G nest entrance. Scale bars: 1 mm (A, B, E); 0.5 mm (C, D, F).

Figure 4. Anthidiellum (Pycnanthidium) carinatum (Wu, 1962), male A lateral habitus B dorsal-posterior habitus C facial view D mandibles E mesosoma in lateral view, red arrow indicating omaular carina F apical metasomal sterna, red arrow indicating apical comb. Scale bars: 1 mm (A, B); 0.5 mm (C-F).