Balionycteris maculata

Habitat. Borneo lowland rainforest, including nutrient-poor heath and peat swamp forest and mangrove forests, and secondary forests up to elevations of ¢. 1000 m.

Sumber: Pteropodidae

Movements, Home range and Social organization. Feeding areas of Bornean Spottedwinged Fruit Bats occur within 1 km? * centered on the roost.

Sumber: Pteropodidae

Status and Conservation. Classified as Least Concern on The IUCN Red List. The Bornean Spotted-winged Fruit Bat can adapt to disturbed habitats.

Sumber: Pteropodidae

Descriptive notes. Head — body 50 - 74 mm (tailless), ear 7 - 11 mm, hindfoot 7 - 8 mm, forearm 38 - 43 mm; weight 11 - 14 g. Head of the Bornean Spotted-winged Fruit Bat is rounded, with short muzzle and sparse hair, and skin is brown; nostrils are shortly tubular and divergent; philtrum is divided into two separate lines from base of nostrils down to upper lip; and lower lip pads are large and fused. Lacrimal has white spot of bare skin. Eyes are large and bulging; iris is dark brown. Ears are short, rounded, and dark brown, with slightly swollen white spot at bases and small tubercles on dorsal surfaces. There is a line of swollen follicles of genal vibrissae. Head pelage is short, soft, and coffee-brown, and nape is sparsely haired; dorsum has longer, dark brown pelage. Uropatagium 1 s narrow and hairy at center, and calcar is short. Males have throat gland. Chest and belly have gray hair bases, washed with yellowish brown tips; sides of neck have longer, yellowish hairs. Wing membranes attach to first toe and are dark grayish brown, flecked with white; all wing digit joints are white and slightly swollen. Skull lacks basicranial deflection. Laterally, rostrum is short, sloping into forehead; orbit is very large; zygomatic root is slightly above upper alveolar line; zygoma is thin and arched posteriorly; and braincase is round. Dorsally, rostrum is broad, postorbital foramen is absent; postorbital processes are very short and blunt; paranasal recesses are inflated and extended posteriorly; temporal lines are low and separate; there is almost no postorbital constriction; braincase is almost rounded; nuchal crest is barely marked; and zygomatic arches are moderately wide. Ventrally, palate is flat; tooth rows are lightly arched; post-dental palate is long and moderately converging, with straight caudal edge; palatine spine is inconspicuous and connected to sphenoid crest; and ectotympanic is small and wider anteriorly, internally edged by ribbon-like entotympanic. Mandible is thin, sloping into a low coronoid with rounded tip; condyle is small, level with lower alveolar line; and angle is distinct and round. Dental formula for all species of Balionycterisis 12 / 1, C 1 / 1, P 3 / 3, M 2 / 2 (x 2) = 30. Upper dentition has two pairs of small incisors; C' is small and slightly decurved; P' is a spicule; next premolar (P?) is large and triangular; P * is low; molars are low, very small, and rectangular in occlusal outline; and M * is tiny and atavistic. Lower dentition has incisors that correspond to I, (I, absent), C, is very small, P, is peg-like, P, is large, posterior cheekteeth decrease in height and are rectangular, and M, is minute. Diploid numberis 2 n = 24.