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Horsfield's tarsier

April 16, 2024

Horsfeld's tarsier (Cephalopachus bancanus) is the only species of tarsier in the genus Cephalopachus. Named by American naturalist Thomas Horsfield, it is also referred to as western tarsier. The species occurs on Borneo, Sumatra and nearby islands and is, like other members of the group, entirely nocturnal.

Western tarsier[1]
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Family: Tarsiidae
Genus: Cephalopachus
Swainson, 1835
Species:
C. bancanus
Binomial name
Cephalopachus bancanus
(Horsfield, 1821)
Western tarsier range
Cephalopachus bancanus borneanus

Taxonomy edit

Although Horsfeld's tarsier was usually placed in the genus Tarsius with all other living tarsiers, it is quite distinct from the Philippine tarsier and the various tarsiers of Sulawesi and nearby islands; therefore, scientists have placed it in a separate genus, Cephalopachus.[3]

The taxonomy of this species is in doubt, with some subspecies considered unsure.[4] In fact, over 20 years few studies have been done on C. bancanus and a taxonomic revision based upon intensive and systematic field surveys is overdue. The IUCN believes that these subspecies should be treated as distinct and named as separate taxa until more definitive evidence is available.[5] When splitting the species into its own genus, Colin Groves and Myron Shekelle recognized the natunensis population as a distinct subspecies.[3]

There are four recognized subspecies of Horsfeld's tarsier:

  • Cephalopachus bancanus bancanus
  • Cephalopachus bancanus saltator — Belitung Island tarsier
  • Cephalopachus bancanus borneanus — Bornean tarsier
  • Cephalopachus bancanus natunensis — Natuna Islands tarsier

Physical description edit

The pelage coloration ranges from pale-olive or reddish brown to pale or dark grey-brown, possibly varying with age. Based on 12 collected specimens,[6] the range measurement from head to body is 121–154 mm (4.8–6.1 in). Horsfield's tarsier has an extremely long tail which can reach 181 to 224 mm (7.1 to 8.8 in) and is hairless except for tufts of hair at the end.[7] This species has two grooming claws on each foot. The fingers are very long and have pads on the tips. The toes have flattened nails except for the second and third toes on hind feet, which bear claw-like nails.[6] It has large eyes which do not reflect light.[inconsistent] The membranous ears are slender and almost bare. The molars of this species have high-cusps and are almost tritubercular.[8] The dental formula of Horsfield's tarsier is 2:1:3:3 on the upper jaw and 1:1:3:3 on the lower jaw.[9]

Habitat and distribution edit

Horsfield's tarsier is found in Southern Sumatra, Borneo and nearby islands.[6] The Bornean subspecies, C. b. borneanus, is known from many lowland sites in Sabah, Brunei, Sarawak and West Kalimantan and above 900 m (3,000 ft) in the Kelabit uplands in Northern Sarawak. Other records show it from Kutai and Peleben in East Kalimantan and Tanjung Maruwe in Central Kalimantan.[6] This species can live in both primary and secondary forests, and it also lives in forests along the coasts or on the edge of plantations.[10]

Behaviour and ecology edit

Horsfield's tarsier is a nocturnal species. It sleeps alone during the day in a tangle of vines or creepers at a height of 3.5 to 5 metres (11 to 16 ft).[11] This species prefers to sleep, rest, or remain stationary on perches that are angled 5 degrees from the vertical tree trunks, 1 to 4 cm (0.39 to 1.57 in) in diameter,[12] and it sleeps solitarily.[13] Before sunset, Horsfield's tarsier will wake up and wait 10 to 20 minutes before moving around the understory and spending 1.5 to 2 hours of the night foraging for food.[10] Horsfield's tarsier can be found from ground level up to a height of 7 m (23 ft) or more in the understory.[6]

 
Horsfield's tarsier in Sarawak

This species is carnivorous. It mainly eats insects such as beetles, grasshoppers, katydids, cockroaches, butterflies, moths, praying mantis, ants, phasmids, and cicadas,[10] but also will eat small vertebrates such as bats (Chiroptera) including members of the genus Taphozous, the lesser short-nosed fruit bat (Cynopterus brachyotis), and the spotted-winged fruit bat (Balionycteris maculata),[10] and snakes, of which poisonous snakes have been found to be consumed. For example, the poisonous snake Maticora intestinalis was found to be hunted for by this species.[10] This species was also found to consume birds, including: spiderhunters, warblers, kingfishers, and pittas.[10] It locates prey primarily by sound and catches the prey with its hands when foraging.[10] The prey items get killed by bites to the back of the neck[10] and the eyes are shut when attacking.[14] It will consume the prey starting with the head and working its way down the body.[10] This species gets water both by drinking from a pool or stream, and by licking drops from bamboo leaves or from trunks of trees when water is running down the bark.[15] Horsfield's tarsier is a host of the acanthocephalan intestinal parasite Moniliformis tarsii.[16]

Horsfield's tarsier, like all tarsiers, is a vertical clinger and leaper known for its extraordinary leaping abilities. An individual will mainly support itself with its feet and the tail exerts enough force to hold the individual in place without using the hands much because of the pads located on the feet. Except when resting, the hands are usually placed no higher than its nose.[12] The hands are only placed higher up to maintain the position of the individual.[12] Other modes of locomotion used by the species include climbing, quadrupedal walking, hopping and "cantilevering."[11]

Horsfield's tarsier is monogamous, with a copulation frequency during estrus of once per night.[17] Courtship calls are performed by the male and he emits 2–3 chirrups while opening and closing the mouth.[17] This call happens within 5 minutes of looking at the female. Once the male gives his courtship call, if the female is receptive, she will perform genital displays to him.[17] If the female is not in estrus, she will emit an agonistic call which is often followed by biting and pushing the male away.[17] Both sexes' calls last on average for 1 second, and the interval between calls is on average 3 seconds.[17]

Infants are born with their eyes open and fully furred and are able to groom themselves.[18] The mother will carry her infant in her mouth and when she forages for food the mother will park the infant on a branch.[19] Infant sounds are mostly clicks: "k", "tk", "ki", or a rapid "kooih"[20] and can be heard when the infant is left alone or is cold.[20] The mother stays in contact with their infants using high-pitched calls. Infants were found to first use the tails as support during resting at 7–10 days.[18] Young leave their range at the onset of puberty, and find their own territory.[18]

Social grooming in this species only occurs between mothers and infants,[21] removing dead skin and parasites by scratching with their toe claws and licking their fur, avoiding their faces. Faces are cleaned by rubbing on branches and it is to reinforce social bonds.[21]

Horsfield's tarsier marks its territory with scents from urine and glandular secretions on a substrate while scratching the surface with its hind-limb toe claws.[17]

Conservation status edit

The rapid loss of habitat due to forest conversion, oil palm plantations, fire and logging is cause for concern.[22] Additionally, the species is also collected for the illegal pet trade and wrongly considered a pest to agricultural crops. It can suffer, directly and indirectly, from the use of agricultural pesticides.

Horsfield's tarsier is listed as vulnerable in the 2008 IUCN Red List of Threatened Species,[2] listed in CITES Appendix II, and protected by law in Indonesia and in Malaysia.

In February 2007, the governments of Brunei, Malaysia, and Indonesia agreed to protect roughly 220,000 km2 (85,000 sq mi) of tropical forest in the "Heart of Borneo" region. Environmental group WWF was particularly active in the establishment of the protected area.[23] In the "Heart of Borneo" project, non-governmental organizations (NGOs) have played a role in promoting the critical initiative and in assisting the transboundary nations in its conceptualization, design, and implementation. The transboundary nations are to improve biodiversity conservation in Bornean production forests, and to ensure that such forests are not simply converted to agricultural land-uses such as oil-palm plantations after logging.[24]

References edit

 
Wikispecies has information related to Tarsius bancanus.
 
Wikimedia Commons has media related to Tarsius bancanus.
  1. ^ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 127. ISBN 0-801-88221-4. OCLC 62265494.
  2. ^ a b Shekelle, M.; Yustian, I. (2020). "Cephalopachus bancanus". IUCN Red List of Threatened Species. 2020: e.T21488A17976989. doi:10.2305/IUCN.UK.2020-3.RLTS.T21488A17976989.en. Retrieved 13 November 2021.
  3. ^ a b Groves, C.; Shekelle, M. (2010). "The Genera and Species of Tarsiidae". International Journal of Primatology. 31 (6): 1071–1082. doi:10.1007/s10764-010-9443-1. S2CID 21220811.
  4. ^ Brandon-Jones, D.; Eudey, A.A.; Geissmann, T.; Groves, C.P.; Melnick D.J., Morales; J.C., Shekelle, M. & Stewart, C.B (2004). "Asian Primate Classification". International Journal of Primatology. 25 (1): 97–164. doi:10.1023/B:IJOP.0000014647.18720.32. S2CID 29045930.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. ^ Shekelle, M.; Yustian, I. (2021). "Cephalopachus bancanus ssp. bancanus". IUCN Red List of Threatened Species. 2021: e.T39762A17992163. doi:10.2305/IUCN.UK.2021-1.RLTS.T39762A17992163.en. Retrieved 13 November 2021.
  6. ^ a b c d e Payne, J.; Francis, C. M. & Phillipps, K (1994). A Field guide to the Mammals of Borneo. Petaling Jaya: The Sabah Society.
  7. ^ Sussman, R.W (1999). Primate Ecology and Social Structure: Vol. 1 Lorises, Lemurs and Tarsiers. Pearson Custom Publishing.
  8. ^ Crompton, R.H.; Savage, R. & Spears, I.R (1998). "The mechanics of food reduction in Tarsius bancanus: Hard-object feeder, soft-object feeder or both?". Folia Primatologica. 69 (suppl 1): 41–59. doi:10.1159/000052698. PMID 9595687. S2CID 24464173.
  9. ^ Nowak, R.M (1999). Walker's Primates of the World. Baltimore: Johns Hopkins University Press. ISBN 0-8018-6251-5.
  10. ^ a b c d e f g h i Niemitz, C. (1979). "Outline of the behavior of Tarsius bancanus". In G.A. Doyle; R.D. Martin (eds.). The Study of Prosimian Behavior. New York: Academic Press.
  11. ^ a b Crompton, R.H.; Andau, P.M (1986). "Locomotion and Habitat Utilization in Free-ranging Tarsius bancanus: A Preliminary Report". Primates. 27 (3): 337–355. doi:10.1007/BF02382075. S2CID 25836867.
  12. ^ a b c Niemitz, C (1984a). "Locomotion and posture of Tarsius bancanus". In C. Niemitz (ed.). Biology of Tarsiers. Stuttgart: Gustav Fischer Verlag. ISBN 0-89574-182-2.
  13. ^ Crompton, R.H.; Andau, P.M (1987). "Ranging, activity rhythms, and sociality in free-ranging Tarsius bancanus: A preliminary report". International Journal of Primatology. 8 (1): 43–71. doi:10.1007/BF02737113. S2CID 39920648.
  14. ^ Fogden, M.P.L (1974). "A preliminary field study of the western tarsier, Tarsius bancanus Horsefield". In R.D. Martin; G.A. Doyle; A.C. Walker (eds.). Prosimian Biology. Pittsburgh: University of Pittsburgh Press.
  15. ^ Niemitz, C (1984d). "Synecological relationships and feeding behaviour of the genus Tarsius". In C. Niemitz (ed.). Biology of Tarsiers. Stuttgart: Gustav Fischer Verlag. ISBN 0-89574-182-2.
  16. ^ Deveaux, Timothy P.; Schmidt, Gerald D.; Krishnasamy, M. (1988). "Two New Species of Moniliformis (Acanthocephala: Moniliformidae) from Malaysia". The Journal of Parasitology. 74 (2): 322–5. doi:10.2307/3282462. JSTOR 3282462. PMID 3128654.
  17. ^ a b c d e f Wright, P.C.; Toyama, L.M. & Simons, E.L (1986). "Courtship and Copulation in Tarsius bancanus". Folia Primatologica. 46 (3): 142–148. doi:10.1159/000156247. PMID 3100401.
  18. ^ a b c Roberts, M (1994). "Growth, development, and parental care in the Western tarsier (Tarsius bancanus) in captivity: Evidence for a "slow" life-history and nonmonogamous mating system". International Journal of Primatology. 15 (1): 1–28. doi:10.1007/BF02735232. S2CID 7462413.
  19. ^ Haring, D.M.; Wright, P.C. & Simons, E.L (1985). "Social behaviors of Tarsius syrichta and Tarsius bancanus". American Journal of Physical Anthropology. 66: 179. doi:10.1002/ajpa.1330660204.
  20. ^ a b Niemitz, C (1984b). "Vocal communication of two tarsier species (Tarsius bancanus and Tarsius spectrum)". In C. Niemitz (ed.). Biology of Tarsiers. Stuttgart: Gustav Fischer Verlag. ISBN 0-89574-182-2.
  21. ^ a b Niemitz, C (1984c). "An investigation and review of the territorial behaviour and social organisation of the genus Tarsius". In C. Niemitz (ed.). Biology of Tarsiers. Stuttgart: Gustav Fischer Verlag. ISBN 0-89574-182-2.
  22. ^ Yustian, I.; Merker, S. & Supriatna, J (2008). "RELATIVE POPULATION DENSITY OF Tarsius dianae IN MAN-INFLUENCED HABITATS". Asian Primates Journal. 1 (1).
  23. ^ Butler, R. A (2006). "Borneo". Retrieved January 27, 2009.
  24. ^ World Wildlife Fund. (2007). Resolution concerning the ‘Heart of Borneo’. Association for Tropical Biology and Conservation.

April 16, 2024
horsfield, tarsier, horsfeld, tarsier, cephalopachus, bancanus, only, species, tarsier, genus, cephalopachus, named, american, naturalist, thomas, horsfield, also, referred, western, tarsier, species, occurs, borneo, sumatra, nearby, islands, like, other, memb. Horsfeld s tarsier Cephalopachus bancanus is the only species of tarsier in the genus Cephalopachus Named by American naturalist Thomas Horsfield it is also referred to as western tarsier The species occurs on Borneo Sumatra and nearby islands and is like other members of the group entirely nocturnal Western tarsier 1 Conservation statusVulnerable IUCN 3 1 2 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass MammaliaOrder PrimatesSuborder HaplorhiniFamily TarsiidaeGenus CephalopachusSwainson 1835Species C bancanusBinomial nameCephalopachus bancanus Horsfield 1821 Western tarsier range Cephalopachus bancanus borneanusContents 1 Taxonomy 2 Physical description 3 Habitat and distribution 4 Behaviour and ecology 5 Conservation status 6 ReferencesTaxonomy editAlthough Horsfeld s tarsier was usually placed in the genus Tarsius with all other living tarsiers it is quite distinct from the Philippine tarsier and the various tarsiers of Sulawesi and nearby islands therefore scientists have placed it in a separate genus Cephalopachus 3 The taxonomy of this species is in doubt with some subspecies considered unsure 4 In fact over 20 years few studies have been done on C bancanus and a taxonomic revision based upon intensive and systematic field surveys is overdue The IUCN believes that these subspecies should be treated as distinct and named as separate taxa until more definitive evidence is available 5 When splitting the species into its own genus Colin Groves and Myron Shekelle recognized the natunensis population as a distinct subspecies 3 There are four recognized subspecies of Horsfeld s tarsier Cephalopachus bancanus bancanus Cephalopachus bancanus saltator Belitung Island tarsier Cephalopachus bancanus borneanus Bornean tarsier Cephalopachus bancanus natunensis Natuna Islands tarsierPhysical description editThe pelage coloration ranges from pale olive or reddish brown to pale or dark grey brown possibly varying with age Based on 12 collected specimens 6 the range measurement from head to body is 121 154 mm 4 8 6 1 in Horsfield s tarsier has an extremely long tail which can reach 181 to 224 mm 7 1 to 8 8 in and is hairless except for tufts of hair at the end 7 This species has two grooming claws on each foot The fingers are very long and have pads on the tips The toes have flattened nails except for the second and third toes on hind feet which bear claw like nails 6 It has large eyes which do not reflect light inconsistent The membranous ears are slender and almost bare The molars of this species have high cusps and are almost tritubercular 8 The dental formula of Horsfield s tarsier is 2 1 3 3 on the upper jaw and 1 1 3 3 on the lower jaw 9 Habitat and distribution editHorsfield s tarsier is found in Southern Sumatra Borneo and nearby islands 6 The Bornean subspecies C b borneanus is known from many lowland sites in Sabah Brunei Sarawak and West Kalimantan and above 900 m 3 000 ft in the Kelabit uplands in Northern Sarawak Other records show it from Kutai and Peleben in East Kalimantan and Tanjung Maruwe in Central Kalimantan 6 This species can live in both primary and secondary forests and it also lives in forests along the coasts or on the edge of plantations 10 Behaviour and ecology editHorsfield s tarsier is a nocturnal species It sleeps alone during the day in a tangle of vines or creepers at a height of 3 5 to 5 metres 11 to 16 ft 11 This species prefers to sleep rest or remain stationary on perches that are angled 5 degrees from the vertical tree trunks 1 to 4 cm 0 39 to 1 57 in in diameter 12 and it sleeps solitarily 13 Before sunset Horsfield s tarsier will wake up and wait 10 to 20 minutes before moving around the understory and spending 1 5 to 2 hours of the night foraging for food 10 Horsfield s tarsier can be found from ground level up to a height of 7 m 23 ft or more in the understory 6 nbsp Horsfield s tarsier in SarawakThis species is carnivorous It mainly eats insects such as beetles grasshoppers katydids cockroaches butterflies moths praying mantis ants phasmids and cicadas 10 but also will eat small vertebrates such as bats Chiroptera including members of the genus Taphozous the lesser short nosed fruit bat Cynopterus brachyotis and the spotted winged fruit bat Balionycteris maculata 10 and snakes of which poisonous snakes have been found to be consumed For example the poisonous snake Maticora intestinalis was found to be hunted for by this species 10 This species was also found to consume birds including spiderhunters warblers kingfishers and pittas 10 It locates prey primarily by sound and catches the prey with its hands when foraging 10 The prey items get killed by bites to the back of the neck 10 and the eyes are shut when attacking 14 It will consume the prey starting with the head and working its way down the body 10 This species gets water both by drinking from a pool or stream and by licking drops from bamboo leaves or from trunks of trees when water is running down the bark 15 Horsfield s tarsier is a host of the acanthocephalan intestinal parasite Moniliformis tarsii 16 Horsfield s tarsier like all tarsiers is a vertical clinger and leaper known for its extraordinary leaping abilities An individual will mainly support itself with its feet and the tail exerts enough force to hold the individual in place without using the hands much because of the pads located on the feet Except when resting the hands are usually placed no higher than its nose 12 The hands are only placed higher up to maintain the position of the individual 12 Other modes of locomotion used by the species include climbing quadrupedal walking hopping and cantilevering 11 Horsfield s tarsier is monogamous with a copulation frequency during estrus of once per night 17 Courtship calls are performed by the male and he emits 2 3 chirrups while opening and closing the mouth 17 This call happens within 5 minutes of looking at the female Once the male gives his courtship call if the female is receptive she will perform genital displays to him 17 If the female is not in estrus she will emit an agonistic call which is often followed by biting and pushing the male away 17 Both sexes calls last on average for 1 second and the interval between calls is on average 3 seconds 17 Infants are born with their eyes open and fully furred and are able to groom themselves 18 The mother will carry her infant in her mouth and when she forages for food the mother will park the infant on a branch 19 Infant sounds are mostly clicks k tk ki or a rapid kooih 20 and can be heard when the infant is left alone or is cold 20 The mother stays in contact with their infants using high pitched calls Infants were found to first use the tails as support during resting at 7 10 days 18 Young leave their range at the onset of puberty and find their own territory 18 Social grooming in this species only occurs between mothers and infants 21 removing dead skin and parasites by scratching with their toe claws and licking their fur avoiding their faces Faces are cleaned by rubbing on branches and it is to reinforce social bonds 21 Horsfield s tarsier marks its territory with scents from urine and glandular secretions on a substrate while scratching the surface with its hind limb toe claws 17 Conservation status editThe rapid loss of habitat due to forest conversion oil palm plantations fire and logging is cause for concern 22 Additionally the species is also collected for the illegal pet trade and wrongly considered a pest to agricultural crops It can suffer directly and indirectly from the use of agricultural pesticides Horsfield s tarsier is listed as vulnerable in the 2008 IUCN Red List of Threatened Species 2 listed in CITES Appendix II and protected by law in Indonesia and in Malaysia In February 2007 the governments of Brunei Malaysia and Indonesia agreed to protect roughly 220 000 km2 85 000 sq mi of tropical forest in the Heart of Borneo region Environmental group WWF was particularly active in the establishment of the protected area 23 In the Heart of Borneo project non governmental organizations NGOs have played a role in promoting the critical initiative and in assisting the transboundary nations in its conceptualization design and implementation The transboundary nations are to improve biodiversity conservation in Bornean production forests and to ensure that such forests are not simply converted to agricultural land uses such as oil palm plantations after logging 24 References edit nbsp Wikispecies has information related to Tarsius bancanus nbsp Wikimedia Commons has media related to Tarsius bancanus Groves C P 2005 Wilson D E Reeder D M eds Mammal Species of the World A Taxonomic and Geographic Reference 3rd ed Baltimore Johns Hopkins University Press p 127 ISBN 0 801 88221 4 OCLC 62265494 a b Shekelle M Yustian I 2020 Cephalopachus bancanus IUCN Red List of Threatened Species 2020 e T21488A17976989 doi 10 2305 IUCN UK 2020 3 RLTS T21488A17976989 en Retrieved 13 November 2021 a b Groves C Shekelle M 2010 The Genera and Species of Tarsiidae International Journal of Primatology 31 6 1071 1082 doi 10 1007 s10764 010 9443 1 S2CID 21220811 Brandon Jones D Eudey A A Geissmann T Groves C P Melnick D J Morales J C Shekelle M amp Stewart C B 2004 Asian Primate Classification International Journal of Primatology 25 1 97 164 doi 10 1023 B IJOP 0000014647 18720 32 S2CID 29045930 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link Shekelle M Yustian I 2021 Cephalopachus bancanus ssp bancanus IUCN Red List of Threatened Species 2021 e T39762A17992163 doi 10 2305 IUCN UK 2021 1 RLTS T39762A17992163 en Retrieved 13 November 2021 a b c d e Payne J Francis C M amp Phillipps K 1994 A Field guide to the Mammals of Borneo Petaling Jaya The Sabah Society Sussman R W 1999 Primate Ecology and Social Structure Vol 1 Lorises Lemurs and Tarsiers Pearson Custom Publishing Crompton R H Savage R amp Spears I R 1998 The mechanics of food reduction in Tarsius bancanus Hard object feeder soft object feeder or both Folia Primatologica 69 suppl 1 41 59 doi 10 1159 000052698 PMID 9595687 S2CID 24464173 Nowak R M 1999 Walker s Primates of the World Baltimore Johns Hopkins University Press ISBN 0 8018 6251 5 a b c d e f g h i Niemitz C 1979 Outline of the behavior of Tarsius bancanus In G A Doyle R D Martin eds The Study of Prosimian Behavior New York Academic Press a b Crompton R H Andau P M 1986 Locomotion and Habitat Utilization in Free ranging Tarsius bancanus A Preliminary Report Primates 27 3 337 355 doi 10 1007 BF02382075 S2CID 25836867 a b c Niemitz C 1984a Locomotion and posture of Tarsius bancanus In C Niemitz ed Biology of Tarsiers Stuttgart Gustav Fischer Verlag ISBN 0 89574 182 2 Crompton R H Andau P M 1987 Ranging activity rhythms and sociality in free ranging Tarsius bancanus A preliminary report International Journal of Primatology 8 1 43 71 doi 10 1007 BF02737113 S2CID 39920648 Fogden M P L 1974 A preliminary field study of the western tarsier Tarsius bancanus Horsefield In R D Martin G A Doyle A C Walker eds Prosimian Biology Pittsburgh University of Pittsburgh Press Niemitz C 1984d Synecological relationships and feeding behaviour of the genus Tarsius In C Niemitz ed Biology of Tarsiers Stuttgart Gustav Fischer Verlag ISBN 0 89574 182 2 Deveaux Timothy P Schmidt Gerald D Krishnasamy M 1988 Two New Species of Moniliformis Acanthocephala Moniliformidae from Malaysia The Journal of Parasitology 74 2 322 5 doi 10 2307 3282462 JSTOR 3282462 PMID 3128654 a b c d e f Wright P C Toyama L M amp Simons E L 1986 Courtship and Copulation in Tarsius bancanus Folia Primatologica 46 3 142 148 doi 10 1159 000156247 PMID 3100401 a b c Roberts M 1994 Growth development and parental care in the Western tarsier Tarsius bancanus in captivity Evidence for a slow life history and nonmonogamous mating system International Journal of Primatology 15 1 1 28 doi 10 1007 BF02735232 S2CID 7462413 Haring D M Wright P C amp Simons E L 1985 Social behaviors of Tarsius syrichta and Tarsius bancanus American Journal of Physical Anthropology 66 179 doi 10 1002 ajpa 1330660204 a b Niemitz C 1984b Vocal communication of two tarsier species Tarsius bancanus and Tarsius spectrum In C Niemitz ed Biology of Tarsiers Stuttgart Gustav Fischer Verlag ISBN 0 89574 182 2 a b Niemitz C 1984c An investigation and review of the territorial behaviour and social organisation of the genus Tarsius In C Niemitz ed Biology of Tarsiers Stuttgart Gustav Fischer Verlag ISBN 0 89574 182 2 Yustian I Merker S amp Supriatna J 2008 RELATIVE POPULATION DENSITY OF Tarsius dianae IN MAN INFLUENCED HABITATS Asian Primates Journal 1 1 Butler R A 2006 Borneo Retrieved January 27 2009 World Wildlife Fund 2007 Resolution concerning the Heart of Borneo Association for Tropical Biology and Conservation Retrieved from https en wikipedia org w index php title Horsfield 27s tarsier amp oldid 1211731933, wikipedia, wiki, book, books, library,

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