Williamstilla guangdongensis (Lelej, 1992)

Okayasu, Juriya, Lelej, Arkady S., Williams, Kevin A., Brabant, Craig M., Nguyen, Lien Thi Phuong, Nguyen, Anh Duc, Pham, Thai Hong & Truong, Tuong Thi Cat, 2025, Current knowledge on the velvet ants (Hymenoptera: Mutillidae, Myrmosidae) of Vietnam: faunal review and new distributional records, Zootaxa 5668 (1), pp. 1-104 : 30-31

Williamstilla guangdongensis (Lelej, 1992)

urn:lsid:zoobank.org:act:9AEF624E-509D-4A4D-AB7D-AA6A281D2C50

( Figs 8A–8D)

Ctenotilla guangdongensis Lelej, 1992: 282 , ♀, holotype ♀ (Ding Hu Shan, Guangdong, China) [SCAU]; Lelej 2005: 34; Brothers & Lelej 2017: 56, ♂ ♀; Okayasu et al. 2018: 303, ♀; Williams et al. 2019b: 15 , ♀; Pagliano et al. 2020: 161; Thaochan et al. 2022: 163, ♀; Boutin & Vilhelmsen 2024: supplementary table S2, S3, ♀.

Williamstilla guangdongensis : Lelej 2023: 18, ♂ ♀.

Material examined. 8♂ 2♀. Vietnam: BAC KAN: Ba Be National Park , 31.VII–2.VIII.2000, K. Okajima leg. [1♀ TUA] ; VINH PHUC: Ngoc Thanh, Me Linh , 22°16'51"N 105°71'54"E, 10.IV.2021, IED’s [= Insect Ecology Department’s] collectors leg., Malaise trap [1♂ IEBR] ; HA TINH: Vu Quang, Ben Cat , 18°19'30"N 105°23'8"E, 30 m, 8.VII.2023, X.L. Truong, T.P.L. Nguyen, Q.C. Nguyen, T.N. Tran leg. [1♀ IEBR] ; GIA LAI: Ayun Pa, Ia Rto , 13°21'49.6"N 108°30'06.4"E, 201 m, 1.V.2016, N.T.P. Lien, N.D. Dai, T.T. Ngat leg. [1♂ IEBR] ; Mang Yang , Kon Ka Kinh NP, 14°12'11"N 108°18'58"E, 834 m, 4.V–19.V.2022, L.V. Tinh leg., MT [= Malaise trap] [1♂ IEBR] ; DONG NAI: Cat Tien NP, various dates, C. van Achterberg & R. de Vries leg., malaise [5♂ RMNH] .

Identification source. Keyed using Lelej (2023) and compared with voucher specimens from Thailand ( Williams et al. 2019b) [THNHM].

Previous record. This species was recorded from Vietnam by Williams et al. (2019b) without reference to voucher specimens.

Distribution. Cambodia. China. Laos. Thailand. Vietnam: Bac Kan *, Vinh Phuc *, Ha Tinh *, Gia Lai *, Dong Nai *.

Occurrence in Vietnam. April, May, July, August. South China-Vietnam subtropical evergreen forests, Northern Annamites rain forests, Southern Annamites montane rain forests, and Southeast Indochina dry evergreen forests ecoregions. 30–834 m alt.

Sex association. This species was initially described from the female only. The male was recognized by Brothers & Lelej (2017) and later described and illustrated by Lelej (2023). However, the evidence of this association was not indicated in any of these publications. Williams et al. (2019b) examined a pair in copula from Thailand.

Remarks. The male pictured ( Figs 8A, 8B) was collected in Thailand in copula with a female ( Williams et al. 2019b). This male perfectly matches the male description by Lelej (2023).