Orancistrocerus aterrimus (de Saussure, 1852)

Nguyen, Lien Thi Phuong, Nguyen, Anh D. & Dang, Hoa T., 2024, The solitary wasp genus Orancistrocerus from Vietnam, with descriptions of two new species (Hymenoptera, Vespidae, Eumeninae), ZooKeys 1193, pp. 95-110 : 95

Orancistrocerus aterrimus (de Saussure, 1852)

Fig. 4A-C

Odynerus aterrimus de Saussure, 1852: 121 (key), 128.

Orancistrocerus aterrimus (de Saussure); Truong et al. 2019: 599 (key).

Material examined.

Vietnam • 1♀; Ha Giang, Dong Van ; 12 July 2015 ; Khuat Dang Long; • 2♀; Cao Bang, Nguyen Binh, Tam Kim ; 22°36'17"N, 106°01'47.6"E; alt. 299 m; 18.x. 2015 ; • 1♀; Cao Bang, Nguyen Binh, Tran Hung Dao forest ; 22°36'17"N, 106°01'47.6"E; alt. 470 m; 18.x. 2015; Nguyen Thi Phuong Lien, Nguyen Dac Dai & Nguyen Phuong Minh leg. ; • 1♀; Cao Bang, Thanh Nhat, Ha Lang ; 22°42'9"N, 106°39'52"E, alt. 250 m; 19.xi.2023; Nguyen Quang Cuong & Tran Thi Ngat leg. ; • 2♀♀; Cao Bang, Tra Linh, Thang Hen Lake ; 22°45'33"N, 106°17'46"E; alt. 578 m; 4.viii.2022 ; Nguyen Thi Phuong Lien et al. leg .; • 2♀♀; Cao Bang, Tra Linh, Thang Hen Lake ; 22°45'33"N, 106°17'46"E; alt. 550 m; 18.ix.2023; Nguyen Thi Phuong Lien, Tran Thi Ngat, Nguyen Duc Anh leg. ; • 4♀♀, Cao Bang, Trung Khanh, Dam Thuy, Nguom Ngao cave ; 22°50'43.2"N, 106°22.2"E; 19.ix.2023; Nguyen Thi Phuong Lien, Tran Thi Ngat leg.; • 1♀; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NP; 22°16'65"N, 108°11'08"E; alt. 780 m, 12.viii.2020 ; Nguyen Thi Phuong Lien et al. leg .; • 1♀; Lao Cai, Sa Pa, Ban Ho , Hoang Lien NP; 27-29.vii.2008; Nguyen Thi Phuong Lien leg. ; • 1♀; Lao Cai, Bat Xat, Y Ty , Sim San , 22°37'48"N, 103°34'52"E; alt. 1324 m; 2.viii.2019; Nguyen Thi Phuong Lien, Nguyen Quang Cuong, Tran Thi Ngat leg. ; • 1♀; Dien Bien, Muong Fang ; alt. 500 m; 23.vii.2009; Nguyen Thi Phuong Lien, Pham Huy Phong, Kojima Junichi leg. ; • 1♀; Tuyen Quang, Na Hang, Na Hang NR, Son Phu ranger station; 22°21.2'07"N, 105°24'34.7"E; alt. 264 m, 10.vi.2015, Nguyen Thi Phuong Lien, Nguyen Dac Dai, Truong Xuan Lam leg. ; • 1♂; Lang Son, Huu Lung, Cai Kinh ; 20°31'37.6"N, 105°0'24.2"E; alt. 86 m, 16.vii.2016; Nguyen Thi Phuong Lien, Nguyen Dac Dai, Tran Thi Ngat leg. ; • 1♀; Lang Son, Huu Lung, Huu Lien , Lan Nghe , Huu Lien NR; 21°33'48.6"N, 106°24'36.4"E; alt. 289 m; 11.vi.2018 ; Nguyen Thi Phuong Lien et al. leg .; • 1♀; Bac Giang, Son Dong, An Lac, Dong Bay ; 21°20'42.8"N, 106°56'31.1"E; 12.viii.2012; Kojima Junichi, Nugroho Hari, Nguyen Thi Phuong Lien leg. ; • 1♀; Quang Ninh, Hoanh Bo, Dong Quang ; 2.viii.2013; Tran Van Tuan leg. ; • 1♀; Hai Phong, Cat Hai, Cat Ba NP, 20°47'38"N, 106°59'45"E; 25.vii.2013; Nguyen Thi Phuong Lien, Nguyen Dac Dai leg. ; • 1♀; Vinh Phuc, Ngoc Thanh, Me Linh ; 7.vi.2001; Truong Xuan Lam leg ; • 4♀♀; Ha Noi, Ba Trai, Ba Vi ; 9.vii.2017; Nguyen Thi Phuong Lien, Luong Viet Tuan leg. ; • 1♀; Hoa Binh, Bao Hieu, Yen Thuy ; 14.vii.1999; Truong Xuan Lam leg. ; 1♀; Hoa Binh, Yen Thuy ; 1.v.2012; Hoang Vu Tru leg. ; • 1♂; Hoa Binh, Mai Chau, Chieng Chau , Lac village ; alt. 600 m; 1.vi.2008; Nguyen Thi Phuong Lien leg. ; • 1♀, 1♂; Thanh Hoa, Thuong Xuan, Van Xuan , Hon Can , Xuan Lien NP; 19°51'55.5"N, 105°14'28.8"E; alt. 120 m; Nest #2012-TH- Eumeninae -01; 23.viii.2012; Nguyen Thi Phuong Lien leg. ; • 1♀; Thanh Hoa, Thuong Xuan, Van Xuan , Hon Can , Xuan Lien NP; 19°52'27.5"N, 105°14'20.8"E; alt. 110 m; 23.viii.2012; Nguyen Thi Phuong Lien leg. ; • 1♀; Da Nang, Vinh Cuu, Phu Ly, Vinh An ; 30.vii.2008 ; ISD-c leg.; • 1♀; Dak Lak, Krong Bong, Krong Kmar , Chu Yang Sin NP; 12°25'02.8"N, 108°22'30.8"E; alt. 1081 m; 4.v.2016; Nguyen Thi Phuong Lien, Nguyen Dac Dai, Tran Thi Ngat leg. ; • 2♀♀; Lam Dong, Da Lat, Bidoup Nui Ba NP; 12°10'56.7"N, 108°40'47.9"E; alt. 1458 m; 7.v.2016; Nguyen Thi Phuong Lien, Nguyen Dac Dai, Tran Thi Ngat leg. ; IEBR. CHINA: • 1♀, 1♂; Tianzhu , Guizhou, viii. 2009; Wang Yang-Wen leg. ; IEBR.

Male genitalia. As in Fig. 4A-C . Parameral spine without setae. Volsella flattened, spatulate, wide on inner aspect, without setae at top. Digitus almost parallel from near base to near apex, then gradually narrowed to apex (Fig. 4A ), its surface covered with setae except glabrous at base, its inner lateral margin with some small and short tubercles at middle, serrated at base. Penis valve short, ~1.7 × as long as basal apodeme (Fig. 4B ), in profile apical part markedly produced into triangular lobe (Fig. 4C ).

Remarks.

Four subspecies have been recognized in O. aterrimus : O. a. aterrimus from China and Vietnam; O. a. erythropus (Bingham, 1897) from India, Myanmar, Laos, and Thailand; O. a. khasianus (Cameron, 1900) from India; and O. a. nigriceps van der Vecht, 1963 from China and Vietnam ( van der Vecht 1963; Kumar and Sharma 2012; Selis 2018; Truong et al. 2019).

In Vietnam, O. a. aterrimus has been recorded in Da Nang province by Selis (2018). Orancistrocerus a. nigriceps has been recorded from Phu Quoc Island, Kien Giang province by van der Vecht (1963) and Truong et al. (2019). Having carefully examined specimens studied by Truong et al. (2019), we found that almost all specimens identified as O. a. nigriceps in their paper are actually O. a. aterrimus , with color of body and wing fitting well into the description by van der Vecht (1963): wings brown with violaceous effulgence, body black, a small spot on mandibles, two small inter-antennal spots, and a line at underside of scape yellow. Two males and two females have the wing base more or less clear hyaline, as the color character to separate O. a. erythropus from O. a. aterrimus as noted by van der Vecht (1963). Of those, one male from Xuan Lien NP, Thanh Hoa province has its wings fully clear hyaline, and this male comes from the same nest (Nest #2012-TH- Eumeninae -01) as a female, but the female is colored as O. a. aterrimus (wings brown with violaceous effulgence). Thus, the color of wing base cannot be used to separate the subspecies O. a. aterrimus and O. a. erythropus , and, thus, we synonymize O. a. erythropus with the nominate subspecies (new synonymy). One specimen examined by Truong et al. (2019) has subhyaline wings, but the clypeus and antennal scape were not entirely black (clypeus black with two large yellow spots laterally and one small yellow spot medially; antennal scape yellow beneath), and we cannot assign this specimen to any subspecies of O. aterrimus . At the moment, two subspecies of O. aterrimus are recorded in Vietnam, namely O. a. aterrimus and O. a. nigriceps . Due to the lack of specimens, the status is left as it is until more specimens are available to us. In this paper, all specimens examined are treated at the species level. Herein, the male genitalia of the species are described and figured for the first time (based on a male of O. a. aterrimus ).

Figures

Figure 4. Orancistrocerus aterrimus, male A genitalia, inner aspect of paramere with volsella and digitus B aedeagus, ventral view C aedeagus, lateral view. Scale bars: 1 mm.