Coelops frithii Blyth 1848

Coelops frithii Blyth, 1848 New material: One pregnant female (VN 19-53, voucher specimen, in alcohol), 19 March 2019, and two parous females (20191205.01, 20191205.02, voucher specimens, in alcohol), 5 December 2019, secondary lowland mixed forest, Co To mountain, Tri Ton district, An Giang province (10.388637 oN, 104.995033 oE [AG1, Figure 1]). Morphology: Our bats were unequivocally identified as Coelops frithii based on diagnostic characters provided by Kruskop (2013). They are small-sized bats with a FA of 38.4–39.2 mm. External tail virtually absent, interfemoral membrane slightly reduced, wings broad and rounded, terminal phalanges of 4th and 5th wing digits with conspicuous T-shaped cartilaginous apexes. Ears broadly rounded, with very well developed antitragal lobes, not separated by notches. Noseleaf rather simple, with reduced intermediate leaf and small posterior leaf not subdivided by median septa (Figure 2G). Echolocation: Consistent with the previous studies (Győrössy et al. 2024a; Ho et al. 2013; Huang et al. 2019a), our bats emitted calls of varying structures, where the dominant energy in the second harmonic was typically concentrated in the FM sweep (ca. 160 kHz) rather than the very short quasi-constant frequency (QCF) component (192–194 kHz) preceding this (Appendix 4). Genetic s: Our Bayesian tree reconstructed from Cytb sequences show our bat (VN 19-53) nested well in a well-supported monophyletic lineage alongside its conspecifics from China and Taiwan. Genetic distances among our bats and their Chinese and Taiwanese allies ranged between 4.2–6.1% (data not shown). Distribution and ecological notes: Coelops frithii is a widespread species, occurring from Bangladesh and Northeast India eastwards to South China and Taiwan, and southwards through Myanmar, Thailand, Laos, and Vietnam as far as western Malaysia, Sumatra, Java, and Bali (Huang et al. 2019a, b). Literature review indicates that the southern distribution limit of this species in Vietnam and Cambodia was confined to Cat Tien NR (Dong Nai; ca. 200 km) (Kruskop 2013) and Phnom Kulen NP (Siem Riep; ca. 350 km) (Chheang et al. 2013), respectively. However, recent records from AG1 [Figure1] and from Banteay Meas district, Kampot province, Cambodia (ca. 50 km away) by Charles Francis in 2022 (https://charles-francis.smugmug.com) extend the known range of this species to the coastal region between southeastern Cambodia and the VMD. Our records also confirm its forest-dependent ecology and reproductive phenology (e.g., with a record of pregnant female in March) as reported in Huang et al. (2019b).