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line:xlsx:hash://sha256/181a039844a33e66a35a457b7ece741051086608e425a040051b79581d606b97!/Sheet1!/L123	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	N/A	N/A	N/A	N/A	N/A	N/A	Cassistrellus yokdonensis	Cassistrellus yokdonensis	Cassistrellus yokdonensis	N/A	Cassistrellus yokdonensis	Cassistrellus yokdonensis	Cassistrellus yokdonensis	Cassistrellus yokdonensis	Cassistrellus yokdonensis		[HMW] Cassistrellus yokdonensis Ruedi et al., 2017 , “ Vietnam , Dak Lak province ; Yok Don National Park , Dak Ken River (tributary of the Serepok River ), base of Yok Mt. Geographic coordinates 12.8672°N , 107.7075°E , at 194 m asl in dry, open dipterocarp forest.” Until this species was described formally in 2017 it waslisted in the DNA molecular phylogenetic study by C. M. Francis and colleagues in 2010 as Eptesicus sp. A JLE-2010, a form very distantly related to any other Eptesicus . It is sister to C. dimissus , the pair being most closely related to Tylonycteris and Philetor . Monotypic.; [MDD2022] recently described; [MDD2023] recently described; [MDD2025_2.0] recently described; [MDD2025_2.2] recently described														yokdonensis				yokdonensis	yokdonensis			yokdonensis Ruedi, Eger, B. K. Lim, & Csorba, 2017						N/A																																								NA																											4C3D87E8FFE56A5AFA4E9258171BB055	Handbook of the Mammals of the World – Volume 9 Bats, Barcelona: Lynx Edicions	978-84-16728-19-0	hbmw_9_Vespertilionidae_716.pdf.imf	hash://md5/b004ff90fffb6a44fffc96591e00bb32	788	zip:hash://sha256/ec5fd314a06aba1a7b0b72f23e54ac625ae272bd98f82f1d01f4c09627d9e8e0!/treatments-xml-main/data/4C/3D/87/4C3D87E8FFE56A5AFA4E9258171BB055.xml	Cassistrellus yokdonensis	Vespertilionidae	Cassistrellus	yokdonensis	Ruedi, Eger, Lim & Csorba	2017	Vespertilion du Yok Don @fr | Yok-Don-Helmfledermaus @de | Casistrelo de Yok Don @es	Cassistrellus yokdonensis Ruedi et al., 2017 , “ Vietnam , Dak Lak province ; Yok Don National Park , Dak Ken River (tributary of the Serepok River ), base of Yok Mt. Geographic coordinates 12.8672°N , 107.7075°E , at 194 m asl in dry, open dipterocarp forest.” Until this species was described formally in 2017 it waslisted in the DNA molecular phylogenetic study by C. M. Francis and colleagues in 2010 as Eptesicus sp. A JLE-2010, a form very distantly related to any other Eptesicus . It is sister to C. dimissus , the pair being most closely related to Tylonycteris and Philetor . Monotypic.	Known only from the type locality in Yok Don National Park, SC Vietnam .	Head—body 61-66 mm, tail 46-52 mm, ear 14-6-15-2 mm, hindfoot 12 mm , forearm 43-47-5 mm; weight 12-15 g. The Yok Don Helmeted Bat is characterized by pointed, narrow wings similar in shape to those of Nyctalus , but less narrow. It has sparse fur, with short hairs; dorsally it is clove-brown; underparts are beige, being cream-colored on throat; there is no glossy tinge to the fur. Wing membranes and otherskin parts are blackish brown. Wing membranes attach to distal end of metatarsus. Calcar extends less than halfway to tail and has no visible lobe. Yok Don Helmeted Bat exceeds the largest Surat Helmeted Bat (C. dimissus ) in measurements. Skull is rather large, but the characteristic helmet present in the Surat Helmeted Bat is less apparent. Skull possesses a pair of deep, well-defined basisphenoid pits and prominent preorbital processes that are also present in the Surat Helmeted Bat. Dental formula for both species of Cassistrellusis12/3,C1/1,P1/2,M 3/3 (x2) = 32. This species has substantially larger and much stronger dentition in general than its congener, with subequal small lower premolars, longer more curved C', and procumbent upper incisors. Condylo-canine length 15:7-16-5 mm; maxillary tooth row 6-3-6-6 mm.	Dry open dipterocarp forest in lowlands.	No information.	No information.	The two Yok Don Helmeted Bat specimens were caught as they flew into large canopy nets (set 10 m aboveground) in dry open dipterocarp forest in lowlands.	Other bats caught in the same nets included Taphozous, Pipistrellus , Murina , Cynopterus , Megaerops , and Rhinolophus species; several Hylopetes flying squirrels and a flying gecko (Ptychozoon trinotaterra) were also caught.	Not assessed on The [UCN Red List, due to its recent recognition as a species. Known only from a subadult male and a juvenile female. Additional studies are needed into the distribution, abundance, general ecology, and threats to this species. It occurs within the Yok Don National Park, the second largest in Vietnam , and the only one to conserve dry deciduous dipterocarp forests in Vietnam .	Francis et al. (2010) | Gorfol et al. (2019) | Ruedi, Eger et al. (2017)	https://zenodo.org/record/6397890/files/figure.png	57. Yok Don Helmeted Bat Cassistrellus yokdonensis French: Vespertilion du Yok Don / German: Yok-Don-Helmfledermaus / Spanish: Casistrelo de Yok Don Taxonomy. Cassistrellus yokdonensis Ruedi et al., 2017 , “ Vietnam , Dak Lak province ; Yok Don National Park , Dak Ken River (tributary of the Serepok River ), base of Yok Mt. Geographic coordinates 12.8672°N , 107.7075°E , at 194 m asl in dry, open dipterocarp forest.” Until this species was described formally in 2017 it waslisted in the DNA molecular phylogenetic study by C. M. Francis and colleagues in 2010 as Eptesicus sp. A JLE-2010, a form very distantly related to any other Eptesicus . It is sister to C. dimissus , the pair being most closely related to Tylonycteris and Philetor . Monotypic. Distribution. Known only from the type locality in Yok Don National Park, SC Vietnam . Descriptive notes. Head—body 61-66 mm, tail 46-52 mm, ear 14-6-15-2 mm, hindfoot 12 mm , forearm 43-47-5 mm; weight 12-15 g. The Yok Don Helmeted Bat is characterized by pointed, narrow wings similar in shape to those of Nyctalus , but less narrow. It has sparse fur, with short hairs; dorsally it is clove-brown; underparts are beige, being cream-colored on throat; there is no glossy tinge to the fur. Wing membranes and otherskin parts are blackish brown. Wing membranes attach to distal end of metatarsus. Calcar extends less than halfway to tail and has no visible lobe. Yok Don Helmeted Bat exceeds the largest Surat Helmeted Bat (C. dimissus ) in measurements. Skull is rather large, but the characteristic helmet present in the Surat Helmeted Bat is less apparent. Skull possesses a pair of deep, well-defined basisphenoid pits and prominent preorbital processes that are also present in the Surat Helmeted Bat. Dental formula for both species of Cassistrellusis12/3,C1/1,P1/2,M 3/3 (x2) = 32. This species has substantially larger and much stronger dentition in general than its congener, with subequal small lower premolars, longer more curved C', and procumbent upper incisors. Condylo-canine length 15:7-16-5 mm; maxillary tooth row 6-3-6-6 mm. Habitat. Dry open dipterocarp forest in lowlands. Food and Feeding. No information. Breeding. No information. Activity patterns. The two Yok Don Helmeted Bat specimens were caught as they flew into large canopy nets (set 10 m aboveground) in dry open dipterocarp forest in lowlands. Movements, Home range and Social organization. Other bats caught in the same nets included Taphozous, Pipistrellus , Murina , Cynopterus , Megaerops , and Rhinolophus species; several Hylopetes flying squirrels and a flying gecko (Ptychozoon trinotaterra) were also caught. Status and Conservation. Not assessed on The [UCN Red List, due to its recent recognition as a species. Known only from a subadult male and a juvenile female. Additional studies are needed into the distribution, abundance, general ecology, and threats to this species. It occurs within the Yok Don National Park, the second largest in Vietnam , and the only one to conserve dry deciduous dipterocarp forests in Vietnam . Bibliography. Francis et al. (2010), Gorfol et al. (2019), Ruedi, Eger et al. (2017).	Simmons, N.B. and A.L. Cirranello. 2022B. Bat Species of the World: A taxonomic and geographic database. Accessed on 10/11/2022.	Vespertilionidae	Cassistrellus yokdonensis	Cassistrellus		yokdonensis	Ruedi, Eger, Lim & Csorba	2018	0	J. Mammal.	20(1): 216	Yokdon Helmeted Bat	None.	Vietnam, Dak Lak province, Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mountain	Known only from the type locality	Not listed (new species).	Not Evaluated		Mammal Diversity Database. (2023). Mammal Diversity Database (Version 1.11) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.7830771 released 15 April 2023	Cassistrellus yokdonensis	23	Yok Don Helmeted Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	CHIROPTERA	VESPERTILIONIFORMES	NA	NA	VESPERTILIONOIDEA	VESPERTILIONIDAE	VESPERTILIONINAE	VESPERTILIONINI	Cassistrellus	NA	yokdonensis	Ruedi, Eger, B. K. Lim, & Csorba	2017	0	Cassistrellus_yokdonensis	Ruedi, M., Eger, J. L., Lim, B. K., & Csorba, G. (2018). A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of Mammalogy, 99(1), 216.	https://academic.oup.com/jmammal/article/99/1/209/4753654	ROM 107751		"Vietnam, Dak Lak province; Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mt. Geographic coordinates 12.8672°N, 107.7075°E, at 194 m a.s.l. in dry, open dipterocarp forest."	12.867	107.71	yokdonensis Ruedi, Eger, B. K. Lim, & Csorba, 2017	recently described	Ruedi, M., Eger, J. L., Lim, B. K., & Csorba, G. (2018). A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of mammalogy, 99(1), 209-222.	Vietnam	Asia	Indomalaya	NA	0	0	0	Cassistrellus_yokdonensis	0	unmatched	NA	1																																			Simmons, N. B., & Cirranello, A. L. (2023). Batnames.org Species List Version 1.4 (1.4). Zenodo. https://doi.org/10.5281/zenodo.8136157 	Vespertilionidae	Cassistrellus		yokdonensis	Ruedi, Eger, Lim & Csorba	2018	0	J. Mammal.	99(1): 216	Yokdon Helmeted Bat	None.	Vietnam, Dak Lak province, Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mountain	Known only from the type locality	Not listed (new species).	Not Evaluated		Cassistrellus yokdonensis	1005702	23	Yok Don Helmeted Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	CHIROPTERA	VESPERTILIONIFORMES	NA	NA	VESPERTILIONOIDEA	Vespertilionidae	VESPERTILIONINAE	VESPERTILIONINI	Cassistrellus	NA	yokdonensis	Ruedi, Eger, B. K. Lim, & Csorba	2017	0	Cassistrellus_yokdonensis	Ruedi, M., Eger, J. L., Lim, B. K., & Csorba, G. (2018). A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of Mammalogy, 99(1), 216.	https://academic.oup.com/jmammal/article/99/1/209/4753654	ROM 107751		"Vietnam, Dak Lak province; Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mt. Geographic coordinates 12.8672°N, 107.7075°E, at 194 m a.s.l. in dry, open dipterocarp forest."	12.8672	107.7075	yokdonensis Ruedi, Eger, B. K. Lim, & Csorba, 2017	recently described	Ruedi, M., Eger, J. L., Lim, B. K., & Csorba, G. (2018). A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of mammalogy, 99(1), 209-222.				Vietnam	Asia	Indomalaya	NA	0	0	0	Cassistrellus_yokdonensis	0	unmatched	NA	1	Burgin, C. J., Zijlstra, J. S., Becker, M. A., Handika, H., Alston, J. M., Widness, J., Liphardt, S., Huckaby, D. G., and Upham, N. S. (2025). How many mammal species are there now? Updates and trends in taxonomic, nomenclatural, and geographic knowledge. Journal of Mammalogy in revision: TBD. https://doi.org/10.1101/2025.02.27.640393	Cassistrellus_yokdonensis	1005702	23	Yok Don Helmeted Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	Chiroptera	Yangochiroptera	NA	NA	Vespertilionoidea	Vespertilionidae	Vespertilioninae	Vespertilionini	Cassistrellus	NA	yokdonensis	Ruedi, Eger, B. K. Lim, & Csorba	0	Cassistrellus yokdonensis	Ruedi, M., Eger, J.L., Lim, B.K. and Csorba, G. 2017-12-22. A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of Mammalogy 99(1):209-222.	https://doi.org/10.1093/jmammal/gyx156	ROM:MAM:107751	holotype	http://portal.vertnet.org/o/rom/mammals?id=uri-catalog-rom-mammals-107751	"Vietnam, Dak Lak province; Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mt. Geographic coordinates 12.8672°N, 107.7075°E, at 194 m a.s.l. in dry, open dipterocarp forest."	12.8672	107.7075	recently described	Ruedi, M., Eger, J. L., Lim, B. K., & Csorba, G. (2018). A new genus and species of vespertilionid bat from the Indomalayan Region. Journal of mammalogy, 99(1), 209-222.				Vietnam	Asia	Indomalaya	NE	0	0	0	Cassistrellus_yokdonensis	0	unmatched	NA	1	Simmons, N. B., & Cirranello, A. L. (2025). Batnames.org Species List Version 1.7 (1.7). Zenodo. https://doi.org/10.5281/zenodo.14796586	Vespertilionidae	Cassistrellus		yokdonensis	Ruedi, Eger, Lim & Csorba	2018	0	J. Mammal.	99(1): 216	Yokdon Helmeted Bat	None.	Vietnam, Dak Lak province, Yok Don National Park, Dak Ken River (tributary of the Serepok River), base of Yok Mountain	Known only from the type locality	<a href='https://cites.org/eng/app/appendices.php' target='_blank'>Not Listed</a>	Not Evaluated			Mammal Diversity Database. (2025). Mammal Diversity Database (Version 2.2) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.15007505	NA	Cassistrellus yokdonensis; Cassistrellus yokdonensis; Cassistrellus yokdonensis; Cassistrellus yokdonensis; yokdonensis; Vespertilion du Yok Don; Yok-Don-Helmfledermaus; Casistrelo de Yok Don; Yok Don Helmeted Bat; Yokdon Helmeted Bat; C. yokdonensis