The hairless bat (Cheiromeles torquatus), also called the naked bulldog bat[2] and greater naked bat,[1] is a species of bat in the family Molossidae. The generic name Cheiromeles comes from the Greek word cheir (Greek for hand) and the species name is derived from the Latin torques (Latin for collar).[2]
The hairless bat is mostly hairless, but does have short, bristly hairs around its neck, on its front toes, and around the throat sac, along with fine hairs on the head and tail membrane.[4]
This species is predominantly concentrated in the South East Asian regions of Myanmar, Indonesia, Malaysia, Java, Thailand, Sumatra and Borneo. Some are also found in the Island surrounding Philippines.[5] There is no current estimate of population size as it is highly dispersed and rarely found. It inhabits mainly lowlands, marshes, rocky surfaces with holes and crevices, dens, farms and trees. It is a colonial species, roosting in groups to conserve energy. It is typically harmless but is considered a pest in some rice growing areas.[1]
Descriptionedit
Its dark grey skin is largely hairless, but may have some fine patches of hair around the throat and under hind foot. They scent mark their territories with secretions from glands located at the tip of the neck. Sometimes these secretory glands have sub maxillary pouches located either inside the ears or beneath the neck region used for 'brooding' and 'nursing' purposes.[6] It possesses a broad face, robust jaw, wide wings and protruding tail that is longer than the hind limb. The first toe bears a nail rather than a claw, and is opposable. The dental formula is 1/1, 1/1, 1/2, 3/2 with small incisors and a diastema forms between upper and lower incisors.[6]
Reproductionedit
C.torquatus produces an average of two litters a year and as soon as they are born, the mother leaves them at the roost to hunt.[7] Males typically do not invest in parental care.
Behavioredit
They are nocturnal, migratory and colonial. Hunting starts early in the morning and they typically prey on larger insects than other bats.[8]
Threatsedit
The species' population is decreasing due to roost sites being destroyed. Additionally, habitat fragmentation causes individuals to relocate to different regions, resulting in isolation. Some indigenous Malay people eat these bats as delicacy and kill them in large numbers.[9] This is drastically reducing the overall population of these bats, making them vulnerable.[10]
Conservation actionsedit
Despite their role in pest control, their population is in danger due to human activity. Population recovery is being attempted in some regions and some are being placed in protected areas with ongoing habitat reconstruction. Attempts are also being made to educate indigenous people about their ecological importance.[11]
Referencesedit
^ abcSenawi, J.; Csorba, G.; Bumrungsri, S.; Francis, C.; Bates, P.J.J.; Gumal, M.; Kingston, T. (2019). "Cheiromeles torquatus". IUCN Red List of Threatened Species. 2019: e.T4601A22035361. doi:10.2305/IUCN.UK.2019-3.RLTS.T4601A22035361.en. Retrieved 16 November 2021.
^ abLeong, T. M., et al. (2009). The naked bulldog bat, Cheiromeles torquatus in Singapore—past and present records, with highlights on its unique morphology (Microchiroptera: Molossidae. 2015-04-02 at the Wayback MachineNature in Singapore 2, 215-30.
^Kingston, T., et al. (2003). Journal of Mammalogy 84(1), 205-15.
^Thomson, P. (2002). "Cheiromeles torquatus". Animal Diversity Web. Retrieved 29 October 2013.
^Clements, R., Sodhi, N. S., Schilthuizen, M. and Ng, P. K. L. 2006. Limestone Karsts of Southeast Asia: Imperiled Arks of Biodiversity. BioScience 56(9): 733–742
^ abLekagul, B., J. McNeely. 1977. Mammals of Thailand. Bangkok: Sahakarnbhat.
^Leong, T. M., S. C. Teo & K. K. P. Lim, 2009. The Naked Bulldog Bat, Cheiromeles torquatus in Singapore — past and present records, with highlights on its unique morphology (Microchiroptera: Molossidae). Nature in Singapore, 2: 215–230
^Freeman, P. March 31, 1981. A Multivariate Study of the Family Molossidae (Mammalia, Chiroptera): Morphology, Ecology, Evolution. FIELDIANA Zoology, New Series, No. 7: 87-88.
^Leong, T. M., S. C. Teo & K. K. P. Lim, 2009. The Naked Bulldog Bat, Cheiromeles torquatus in Singapore — past and present records, with highlights on its unique morphology (Microchiroptera: Molossidae). Nature in Singapore, 2: 215–230. [PDF, 1.91 MB]
^Hilton-Taylor, C. 2000. "2000 IUCN Red List of Threatened Species" (On-line). Accessed October 11, 2001 at http://www.redlist.org/search/details.php?species=4601.
^Nowak, R. 1991. Walker's Mammals of the World. Baltimore and London: The Johns Hopkins University Press
External linksedit
Sound recordings of Cheiromeles torquatus on BioAcoustica
December 07, 2023
hairless, hairless, cheiromeles, torquatus, also, called, naked, bulldog, greater, naked, species, family, molossidae, generic, name, cheiromeles, comes, from, greek, word, cheir, greek, hand, species, name, derived, from, latin, torques, latin, collar, conser. The hairless bat Cheiromeles torquatus also called the naked bulldog bat 2 and greater naked bat 1 is a species of bat in the family Molossidae The generic name Cheiromeles comes from the Greek word cheir Greek for hand and the species name is derived from the Latin torques Latin for collar 2 Hairless batConservation statusLeast Concern IUCN 3 1 1 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass MammaliaOrder ChiropteraFamily MolossidaeGenus CheiromelesSpecies C torquatusBinomial nameCheiromeles torquatusHorsfield 1824This bat is a hawking insectivore using echolocation to find insects on the wing 3 The hairless bat is mostly hairless but does have short bristly hairs around its neck on its front toes and around the throat sac along with fine hairs on the head and tail membrane 4 Contents 1 Habitat distribution and range 2 Description 3 Reproduction 4 Behavior 5 Threats 6 Conservation actions 7 References 8 External linksHabitat distribution and range editThis species is predominantly concentrated in the South East Asian regions of Myanmar Indonesia Malaysia Java Thailand Sumatra and Borneo Some are also found in the Island surrounding Philippines 5 There is no current estimate of population size as it is highly dispersed and rarely found It inhabits mainly lowlands marshes rocky surfaces with holes and crevices dens farms and trees It is a colonial species roosting in groups to conserve energy It is typically harmless but is considered a pest in some rice growing areas 1 Description editIts dark grey skin is largely hairless but may have some fine patches of hair around the throat and under hind foot They scent mark their territories with secretions from glands located at the tip of the neck Sometimes these secretory glands have sub maxillary pouches located either inside the ears or beneath the neck region used for brooding and nursing purposes 6 It possesses a broad face robust jaw wide wings and protruding tail that is longer than the hind limb The first toe bears a nail rather than a claw and is opposable The dental formula is 1 1 1 1 1 2 3 2 with small incisors and a diastema forms between upper and lower incisors 6 Reproduction editC torquatus produces an average of two litters a year and as soon as they are born the mother leaves them at the roost to hunt 7 Males typically do not invest in parental care Behavior editThey are nocturnal migratory and colonial Hunting starts early in the morning and they typically prey on larger insects than other bats 8 Threats editThe species population is decreasing due to roost sites being destroyed Additionally habitat fragmentation causes individuals to relocate to different regions resulting in isolation Some indigenous Malay people eat these bats as delicacy and kill them in large numbers 9 This is drastically reducing the overall population of these bats making them vulnerable 10 Conservation actions editDespite their role in pest control their population is in danger due to human activity Population recovery is being attempted in some regions and some are being placed in protected areas with ongoing habitat reconstruction Attempts are also being made to educate indigenous people about their ecological importance 11 References edit a b c Senawi J Csorba G Bumrungsri S Francis C Bates P J J Gumal M Kingston T 2019 Cheiromeles torquatus IUCN Red List of Threatened Species 2019 e T4601A22035361 doi 10 2305 IUCN UK 2019 3 RLTS T4601A22035361 en Retrieved 16 November 2021 a b Leong T M et al 2009 The naked bulldog bat Cheiromeles torquatus in Singapore past and present records with highlights on its unique morphology Microchiroptera Molossidae Archived 2015 04 02 at the Wayback Machine Nature in Singapore 2 215 30 Kingston T et al 2003 Alternation of echolocation calls in 5 species of aerial feeding insectivorous bats from Malaysia Journal of Mammalogy 84 1 205 15 Thomson P 2002 Cheiromeles torquatus Animal Diversity Web Retrieved 29 October 2013 Clements R Sodhi N S Schilthuizen M and Ng P K L 2006 Limestone Karsts of Southeast Asia Imperiled Arks of Biodiversity BioScience 56 9 733 742 a b Lekagul B J McNeely 1977 Mammals of Thailand Bangkok Sahakarnbhat Leong T M S C Teo amp K K P Lim 2009 The Naked Bulldog Bat Cheiromeles torquatus in Singapore past and present records with highlights on its unique morphology Microchiroptera Molossidae Nature in Singapore 2 215 230 Freeman P March 31 1981 A Multivariate Study of the Family Molossidae Mammalia Chiroptera Morphology Ecology Evolution FIELDIANA Zoology New Series No 7 87 88 Leong T M S C Teo amp K K P Lim 2009 The Naked Bulldog Bat Cheiromeles torquatus in Singapore past and present records with highlights on its unique morphology Microchiroptera Molossidae Nature in Singapore 2 215 230 PDF 1 91 MB Hilton Taylor C 2000 2000 IUCN Red List of Threatened Species On line Accessed October 11 2001 at http www redlist org search details php species 4601 Nowak R 1991 Walker s Mammals of the World Baltimore and London The Johns Hopkins University PressExternal links editSound recordings of Cheiromeles torquatus on BioAcoustica Retrieved from https en wikipedia org w index php title Hairless bat amp oldid 1122674782, wikipedia, wiki, book, books, library,
