Hipposideros ridleyi, H. C. Robinson & Kloss, 1911

Don E. Wilson & Russell A. Mittermeier, 2019, Hipposideridae, Handbook of the Mammals of the World – Volume 9 Bats, Barcelona: Lynx Edicions, pp. 227-258 : 258

87.

Ridley’s Leaf-nosed Bat

Hipposideros ridleyi

French: Phyllorhine de Ridley / German: Ridley-Rundblattnase / Spanish: Hiposidérido de Ridley

Other common names: Ridley's Roundleaf Bat, Singapore Roundleaf Horseshoe Bat

Taxonomy. Hipposideros ridleyi H. C. Robinson & Kloss, 1911 ,

“Botanic Gardens, Singapore.”

Hipposideros ridleyi was formerly included in the bicolor species group but is now placed in the new ater species group. Monotypic.

Distribution. Malay Peninsula and N & SW Borneo (Sabah, Sarawak, and Brunei); probably also occurs in the rest of Borneo (Kalimantan), but this has not yet been confirmed.

Descriptive notes. Tail 25-29 mm, ear 24-28 mm, forearm 47-51 mm; weight 7-5-13-5 g. Ears of Ridley’s Leaf-nosed Bat is large. Pelage is uniformly dark brown, slightiy paler on ventral side. Noseleaf is wide and rounded, with deep emargination on anterior leaf. It has no lateral supplementary leaflet. Intemarial septum forms a large disk shape.

Habitat. Ridley’s Leaf-nosed Bat was captured in flat lowland primary rainforests.

Food and Feeding. No information.

Breeding. In Peninsular Malaysia, females were found pregnant with one embryo in March-May, and lactating in May-October.

Activity patterns. Ridley’s Leaf-nosed Bat was captured c.0-5-3 m aboveground in gaps of lowland forest understory. It roosts in hollow trees, pipes, and old houses. Call frequency is 61-62 kHz (Malay Peninsula) and 65-67 kHz (Sabah).

Movements, Home range and Social organization. Ridley’s Leaf-nosed Bats roost in small groups of up to 15 individuals in very large fallen trees with deep hollows. The roost is sexually segregated for the most part. The species was reported to share a hollow tree with Malayan Tailless Leaf-nosed Bats ( Coelops robinsoni ).

Status and Conservation. Classified as Vulnerable on The IUCN Red List. The population of Ridley’s Leaf-nosed Bat is generally declining. The major threat is deforestation.

Bibliography. Corbet & Hill (1992), Francis (2008a), Francis, Kingston & Bumrungsri (2008), Kingston et al. (2006), Phillipps & Phillipps (2016), Simmons (2005).

Figures

67. Timor Leaf-nosed Bat (Hipposideros crumeniferus), 68. Bornean Leaf-nosed Bat (Hipposideros doriae), 69. Durga Das’s Leaf-nosed Bat (Hipposideros durgadasi), 70. Dayak Leaf-nosed Bat (Hipposideros dyacorum), 71. House-dwelling Leaf-nosed Bat (Hipposideros einnaythu), 72. Andersen’s Leaf-nosed Bat (Hipposideros gentilis), 73. Fulvus Leaf-nosed (Bat Hipposiderosfulvus), 74. Thailand Leaf-nosed Bat (Hipposideros halophyllus), 75. Kolar Leaf-nosed Bat (Hipposideros hypophyllus), 76. Phou Khao Khouay Leaf-nosed Bat (Hipposideros khaokhouayensis), 77. Kunz’s Leaf-nosed Bat (Hipposideros kunzi), 78. Big-eared Leaf-nosed Bat (Hipposideros macrobullotus), 79. Maggie Taylor’s Leaf-nosed Bat (Hipposideros maggietaylorae), 80. Malayan Leaf-nosed Bat (Hipposideros nequam), 81. Nicobar Leaf-nosed Bat (Hipposideros nicobarulae), 82. Philippine Forest Leaf-nosed Bat (Hipposideros obscurus), 83. Orbiculus Leaf-nosed Bat (Hipposideros orbiculus), 84. Biak Leaf-nosed Bat (Hipposideros papua), 85. Pomona Leaf-nosed Bat (Hipposideros pomona), 86. Philippine Pygmy Leaf-nosed Bat (Hipposideros pygmaeus), 87. Ridley’s Leaf-nosed Bat (Hipposideros ridleyi), 88. Laotian Leaf-nosed Bat (Hipposideros rotalis)

Distribution. Malay Peninsula and N & SW Borneo (Sabah, Sarawak , and Brunei ); probably also occurs in the rest of Borneo (Kalimantan), but this has not yet been confirmed.