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line:xlsx:hash://sha256/181a039844a33e66a35a457b7ece741051086608e425a040051b79581d606b97!/Sheet1!/L195	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	N/A	N/A	N/A	Molossops abrasus [synonym of]	Molossops abrasus mastivus	Cynomops abrasus mastivus	Cynomops mastivus	Cynomops mastivus	Cynomops mastivus	N/A	Cynomops mastivus	Cynomops mastivus	Cynomops mastivus	Cynomops mastivus	Cynomops mastivus		[HMW] Molossops mastivus Thomas, 1911 , “Bartica Grove, Lower Essequibo,” Cuyuni-Mazaruni , Guyana . Cynomops mastivus was previously considered a subspecies of C. abrasus , but a recent revision based on molecular and morphological data elevated it to a full species. Monotypic.; [batnames2022] Formerly considered a subspecies of abrasus , but clearly distinct, see Moras et al. (2016).; [MDD2022] split from C. abrasus; [batnames2023] Formerly considered a subspecies of abrasus , but clearly distinct, see Moras et al. (2016).; [MDD2023] split from C. abrasus; [MDD2025_2.0] split from C. abrasus; [batnames2025_1.7] Formerly considered a subspecies of abrasus, but clearly distinct, see Moras et al. (2016).; [MDD2025_2.2] split from C. abrasus														mastivus				mastivus	mastivus			mastivus (O. Thomas, 1911)						N/A																																								NA																											194287C9FFAABA06B489FF0CB7FAFC46	Handbook of the Mammals of the World – Volume 9 Bats, Barcelona: Lynx Edicions	978-84-16728-19-0	hbmw_9_Molossidae_598.pdf.imf	hash://md5/e57bffb1ffbcba10b412f760b226ffce	641	zip:hash://sha256/ec5fd314a06aba1a7b0b72f23e54ac625ae272bd98f82f1d01f4c09627d9e8e0!/treatments-xml-main/data/19/42/87/194287C9FFAABA06B489FF0CB7FAFC46.xml	Cynomops mastivus	Molossidae	Cynomops	mastivus		1911	Grand Cynomope @fr | Thomas-Bulldogfledermaus @de | Cynomop de Thomas @es	Molossops mastivus Thomas, 1911 , “Bartica Grove, Lower Essequibo,” Cuyuni-Mazaruni , Guyana . Cynomops mastivus was previously considered a subspecies of C. abrasus , but a recent revision based on molecular and morphological data elevated it to a full species. Monotypic.	Known from scattered localities in lowlands of N South America, from E slopes of Andes in Ecuador to E Venezuela , the Guianas, and Brazilian Amazon.	Head-body 74-88 mm, tail 32-44 mm, ear 16-20 mm, hindfoot 10-13 mm, forearm 41-8-51-2 mm; weight 27-54-8 g. Males are larger and heavier than females. Thomas's Dog-faced Bat is the largest Cynomops . Dorsal pelage is dark reddish brown with uniformly brown venter, similar to or slightly paler than dorsum; pelage is silky, but dorsal fur is not long (c. 4 mm at shoulder); dorsal hairs are weakly bicolored, with basal one-third pale buff. Face is blackish and virtually naked. Upper lip and dorsal border of narial region are smooth. Triangular blackish ears are slightly separated from each other on forehead (space less than 4 mm ). Patagium, feet, and tail are also blackish. Propatagium is narrow, and posterior plagiopatagium is inserted lateral to base of feet. There is dark chocolate-brown fur along basal one-third offorearm and along adjacent propatagium. A patch of fur extends from posterodorsal surface of distal plagiopatagium, next to wrist, to fourth dactylopatagium. Skull is robust, with sagittal and occipital crests consistently well developed in males. Anterior face of lacrimal ridges forms abrupt angle with forehead, and nasal process of premaxilla is well developed, with lateral margin of external nares vertically straight, particularly in males, and less markedly in females. Incisive foramina are located relatively close to accessory foramen. Lowerjaw is massive with a convex corpus along its length (mainly in males), and there is a large shallow trigonid on M,.	Tropical lowland rainforests from sea level to elevations of 534 m . The species is present in primary and secondary forests.	Thomas’s Dog-faced Batis an aerial insectivore, and insects of the order Coleoptera have been recorded in its diet in Amazonian Brazil .	Reproductive data are scarce, but lactating females were recorded in July in Guyana and a male with scrotal testes was captured in July in Manaus, Brazil .	One specimen was captured at ¢.19:00 h in Suriname . Thomas’s Dogfaced Bat has been captured in mist nets set alongside or over rivers, and next to ponds in clearings of mature forests. It was also caught in canopy nets set 18-30 m aboveground.	Six individuals from Manaus, were recorded sharing a roost in leaves of a buriti palm ( Mauritia sp. , Arecaceae ) with six individuals of Trumbull’s Bonneted Bat ( Eumops trumbulli ).	Not assessed on The [UCN Red List.	Bernard (2001) | Eger (2008) | Handley (1976) | Moras et al. (2016) | Reis & Peracchi (1987) | Simmons & Voss (1998) | Tirira (2012b, 2017) | Uieda & Taddei (1980) | Williams & Genoways (1980a) | Warner et al. (1974)	https://zenodo.org/record/6567788/files/figure.png	55. Thomas's Dog-faced Bat Cynomops mastivus French: Grand Cynomope / German: Thomas-Bulldogfledermaus / Spanish: Cynomop de Thomas Taxonomy. Molossops mastivus Thomas, 1911 , “Bartica Grove, Lower Essequibo,” Cuyuni-Mazaruni , Guyana . Cynomops mastivus was previously considered a subspecies of C. abrasus , but a recent revision based on molecular and morphological data elevated it to a full species. Monotypic. Distribution. Known from scattered localities in lowlands of N South America, from E slopes of Andes in Ecuador to E Venezuela , the Guianas, and Brazilian Amazon. Descriptive notes. Head-body 74-88 mm, tail 32-44 mm, ear 16-20 mm, hindfoot 10-13 mm, forearm 41-8-51-2 mm; weight 27-54-8 g. Males are larger and heavier than females. Thomas's Dog-faced Bat is the largest Cynomops . Dorsal pelage is dark reddish brown with uniformly brown venter, similar to or slightly paler than dorsum; pelage is silky, but dorsal fur is not long (c. 4 mm at shoulder); dorsal hairs are weakly bicolored, with basal one-third pale buff. Face is blackish and virtually naked. Upper lip and dorsal border of narial region are smooth. Triangular blackish ears are slightly separated from each other on forehead (space less than 4 mm ). Patagium, feet, and tail are also blackish. Propatagium is narrow, and posterior plagiopatagium is inserted lateral to base of feet. There is dark chocolate-brown fur along basal one-third offorearm and along adjacent propatagium. A patch of fur extends from posterodorsal surface of distal plagiopatagium, next to wrist, to fourth dactylopatagium. Skull is robust, with sagittal and occipital crests consistently well developed in males. Anterior face of lacrimal ridges forms abrupt angle with forehead, and nasal process of premaxilla is well developed, with lateral margin of external nares vertically straight, particularly in males, and less markedly in females. Incisive foramina are located relatively close to accessory foramen. Lowerjaw is massive with a convex corpus along its length (mainly in males), and there is a large shallow trigonid on M,. Habitat. Tropical lowland rainforests from sea level to elevations of 534 m . The species is present in primary and secondary forests. Food and Feeding. Thomas’s Dog-faced Batis an aerial insectivore, and insects of the order Coleoptera have been recorded in its diet in Amazonian Brazil . Breeding. Reproductive data are scarce, but lactating females were recorded in July in Guyana and a male with scrotal testes was captured in July in Manaus, Brazil . Activity patterns. One specimen was captured at ¢.19:00 h in Suriname . Thomas’s Dogfaced Bat has been captured in mist nets set alongside or over rivers, and next to ponds in clearings of mature forests. It was also caught in canopy nets set 18-30 m aboveground. Movements, Home range and Social organization. Six individuals from Manaus, were recorded sharing a roost in leaves of a buriti palm ( Mauritia sp. , Arecaceae ) with six individuals of Trumbull’s Bonneted Bat ( Eumops trumbulli ). Status and Conservation. Not assessed on The [UCN Red List. Bibliography. Bernard (2001), Eger (2008), Handley (1976), Moras et al. (2016), Reis & Peracchi (1987), Simmons & Voss (1998), Tirira (2012b, 2017), Uieda & Taddei (1980), Williams & Genoways (1980a), Warner et al. (1974).	Simmons, N.B. and A.L. Cirranello. 2022B. Bat Species of the World: A taxonomic and geographic database. Accessed on 10/11/2022.	Molossidae	Cynomops mastivus	Cynomops		mastivus	Thomas	1911	0	Proc. Biol. Soc. Wash.	83:27:00	Mastiff Dog-faced Bat	None.				Data Deficient under Cynomops abrasus 	Formerly considered a subspecies of abrasus , but clearly distinct, see Moras et al. (2016).	Mammal Diversity Database. (2023). Mammal Diversity Database (Version 1.11) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.7830771 released 15 April 2023	Cynomops mastivus	23	Thomas's Dog-faced Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	CHIROPTERA	VESPERTILIONIFORMES	NA	NA	VESPERTILIONOIDEA	MOLOSSIDAE	MOLOSSINAE	NA	Cynomops	NA	mastivus	O. Thomas	1911	1	Molossops_mastivus	Thomas, O. (1911). Three new South-American mammals. Annals and Magazine of Natural History, ser. 8, 7, 113.	https://www.biodiversitylibrary.org/item/53774#page/129/mode/1up	BM 1910.11.10.3		"Bartica Grove, Lower Essequibo," Cuyuni-Mazaruni, Guyana.			mastivus (O. Thomas, 1911)	split from C. abrasus	Moras, L. M., Tavares, V. D. C., Pepato, A. R., Santos, F. R., & Gregorin, R. (2016). Reassessment of the evolutionary relationships within the dog-faced bats, genus Cynomops (Chiroptera: Molossidae). Zoologica Scripta, 45(5), 465-480.	Ecuador|Venezuela|Guyana|Suriname|French Guiana|Brazil	South America	Neotropic	NA	0	0	0	Cynomops_mastivus	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 	Molossidae	Cynomops		mastivus	Thomas	1911	0	Proc. Biol. Soc. Wash.	83:27:00	Mastiff Dog-faced Bat	None.				Data Deficient under Cynomops abrasus 	Formerly considered a subspecies of abrasus , but clearly distinct, see Moras et al. (2016).	Cynomops mastivus	1005169	23	Thomas's Dog-faced Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	CHIROPTERA	VESPERTILIONIFORMES	NA	NA	VESPERTILIONOIDEA	Molossidae	MOLOSSINAE	NA	Cynomops	NA	mastivus	O. Thomas	1911	1	Molossops_mastivus	Thomas, O. (1911). Three new South-American mammals. Annals and Magazine of Natural History, ser. 8, 7, 113.	https://www.biodiversitylibrary.org/item/53774#page/129/mode/1up	BM 1910.11.10.3		"Bartica Grove, Lower Essequibo," Cuyuni-Mazaruni, Guyana.			mastivus (O. Thomas, 1911)	split from C. abrasus	Moras, L. M., Tavares, V. D. C., Pepato, A. R., Santos, F. R., & Gregorin, R. (2016). Reassessment of the evolutionary relationships within the dog-faced bats, genus Cynomops (Chiroptera: Molossidae). Zoologica Scripta, 45(5), 465-480.				Ecuador|Venezuela|Guyana|Suriname|French Guiana|Brazil	South America	Neotropic	NA	0	0	0	Cynomops_mastivus	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	Cynomops_mastivus	1005169	23	Thomas's Dog-faced Bat		Theria	Placentalia	Boreoeutheria	Laurasiatheria	Chiroptera	Yangochiroptera	NA	NA	Vespertilionoidea	Molossidae	Molossinae	NA	Cynomops	NA	mastivus	O. Thomas	1	Molossops mastivus	Thomas, O. 1911-01-01. Three new South-American mammals. Annals and Magazine of Natural History (8)7(37):113-115.	https://www.biodiversitylibrary.org/page/15814817	BMNH:Mamm:1910.11.10.3	holotype	https://data.nhm.ac.uk/object/8721339e-cd48-430e-bff4-70006a1ab254	"Bartica Grove, Lower Essequibo," Cuyuni-Mazaruni, Guyana.			split from C. abrasus	Moras, L. M., Tavares, V. D. C., Pepato, A. R., Santos, F. R., & Gregorin, R. (2016). Reassessment of the evolutionary relationships within the dog-faced bats, genus Cynomops (Chiroptera: Molossidae). Zoologica Scripta, 45(5), 465-480.				Ecuador|Venezuela|Guyana|Suriname|French Guiana|Brazil	South America	Neotropic	NE	0	0	0	Cynomops_mastivus	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	Molossidae	Cynomops		mastivus	Thomas	1911	1	Ann. Mag. Nat. Hist.	ser. 8, 7(37): 207	Mastiff Dog-faced Bat	None.			<a href='https://cites.org/eng/app/appendices.php' target='_blank'>Not Listed</a>	Not Evaluated	Formerly considered a subspecies of abrasus, but clearly distinct, see Moras et al. (2016).		Mammal Diversity Database. (2025). Mammal Diversity Database (Version 2.2) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.15007505	NA	Cynomops mastivus; Cynomops mastivus; Cynomops mastivus; Cynomops mastivus; mastivus; Grand Cynomope; Thomas-Bulldogfledermaus; Cynomop de Thomas; Thomas's Dog-faced Bat; Mastiff Dog-faced Bat; C. mastivus