Rhinolophus borneensis Peters, 1861

Huang, Joe Chun-Chia, Jazdzyk, Elly Lestari, Nusalawo, Meyner, Maryanto, Ibnu, Maharadatunkamsi, Wiantoro, Sigit & Kingston, Tigga, 2014, A recent bat survey reveals Bukit Barisan Selatan Landscape as a chiropteran diversity hotspot in Sumatra, Acta Chiropterologica 16 (2), pp. 413-449 : 429

Rhinolophus borneensis Peters, 1861 /

R. celebensis K. Anderson, 1905

Bornean horseshoe bat/ Sulawesi borseshoe bat

New records

New record to Sumatra; Lampung Province: Kuyung Arang Village, Lombok Village, Sukabanjar Forest, Sukaraja Forest, Sukabanjar Village, and Way Canguk Forest.

New material

Three individuals were collected as voucher specimens. Lampung Province: Sukaraja Forest, 1♂, 2♀♀ (MZB 35874–35876).

Remarks

This medium-sized Rhinolophus species was captured at an elevational of 50–923 m a.s.l. in forest and plantations in mountain areas. This species has a tapered or nearly parallel-sided sella, and a roughly rounded connecting process. Individuals are also characterized by orangey facial skin and bright yellowish or reddish-orange fur. Based on the characters above, this bat is most similar to R. borneensis and R. celebensis in the megaphyllus species group. The two Rhinolophus are hard to be distinguished externally and the taxonomic relationship between the two species is not clear. The current identification is based upon their distribution ranges ( Csorba et al., 2003). Rhinolophus borneensis is known from Borneo and Java; R. celebensis from Java, Bali, Sulawesi, and Timor. Neither species has been recorded yet in Sumatra ( Suyanto et al., 2002; Simmons, 2005; also see Francis, 2008, for the revised status of mainland Southeast Asia populations). Hence, we are not able to assign our samples to either of the two species.

In our study area, it can be distinguished from R. affinis by its less concave sella, from the pusillus group ( R. acuminatus , R. lepidus ) by its roughly rounded connecting process, and from the trifoliatus group ( R. trifoliatus , R. luctus ) by the lack of lateral lappets and smaller body size. Noteworthy, variations in the connecting process (round and slightly pointed) and sella (nearly parallel, slightly concave, and slightly step-wised near base) were observed in individuals from Way Canguk Forest and Sukaraja Forest.