105.

Long-toothed Pipistrelle

Hypsugo dolichodon

French: Vespere a longues dents / German: Langzahn-Zwergfledermaus / Spanish: Hypsugo de dientes largos

Taxonomy. Hypsugo dolichodon Gorfol et al., 2014,

“ 14°57'N, 107°08'E, Xe Kaman proposed dam site, 10 km east from Ban Paam, Attapu Province, Lao PDR, 150 m a.s.l.”

The relationships of Hypsugo dolichodon are uncertain, but it appears to be close to H. petersi and H. pulveratus, based on limited genetic data. Specimens from Cambodia and Myanmar were originally identified as H. affinis, but are now considered to represent this species. Monotypic.

Distribution. Known from scattered localities in SE Myanmar, W & S Cambodia, SE Laos, and S Vietnam.

Descriptive notes. Hindfoot 5-9-7 mm, forearm 35-2-38-4 mm. No other specific measurements are available. Dorsal pelage of the Long-toothed Pipistrelle is blackish brown (hairs with paler tips), and ventral pelage lighter (hairs blackish brown on basal one-half and dirty white on distal one-half). Bare portions of face, ears, limbs, and wings are nearly black. Ears are relatively short and wide and somewhat rounded at tip; tragus is short and squarish. Tail extends a little beyond margin of uropatagium; calcar extends halfway to tail from ankle, and has narrow Postcalcarial lobe—Tless defined than in the Chinese Pipistrelle ( Hypsugo pulveratus). Baculum has more developed base with enlarged lateral projection, narrowing shaft, and shallower ventral depression on tip when compared to the Chocolate Pipistrelle ( H. affinis). Skull is large with relatively robust, long, narrow rostrum; rostral profile of skull is almost flat; braincase is flattened; there is no sagittal crest; lambdoid crest is pronounced; and basioccipital pits are shallow but visible. I* is bicuspid; C' and C, are relatively slender and long; P? is small and intruded but C' and P* are still separated; and lower molars are myotodont.

Habitat. The Long-toothed Pipistrelle has been reported in lowland evergreen rainforest at elevations of 50-400 m throughout much ofits range, and is associated with limestone outcrops. Reported at 978 m elevation in limestone caves surrounded by evergreen rainforest and cultivated areas in Cambodia.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. Long-toothed Pipistrelles roost in caves.

Movements, Home range and Social organization. No information.

Status and Conservation. Not assessed on The [UCN Red List. The Long-toothed Pipistrelle is known only from a few localities and does not seem to be very common. It may be threatened by habitat destruction due to limestone extraction, and general human disturbance. Further studies are needed, particularly into general ecology and threats.

Bibliography. Gorfol & Csorba (2018), Gorfél, Csorba et al. (2014), Gorfol, Furey et al. (2019), Lim, L.S. et al. (2016).