Rhinolophus chaseni Sanborn 1939
Creators: name: Burgin, Connor
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Chiroptera
Rhinolophidae
Rhinolophus
Rhinolophus chaseni

description: 58. Indochinese Horseshoe Bat <i>Rhinolophus chaseni</i> French: Rhinolophe <i>de</i> Chasen / <b>German:</b> <i>Chasen-Hufeisennase</i> / <b>Spanish:</b> Herradura de Chasen <b>Taxonomy.</b> <i>Rhinolophus chaseni</i> Sanborn, 1939, “ Pulo [= Island] Condore, off the southeast coast of Cochin-China [= southern Vietnam].” <i>Currendy</i> included in the <i>megaphyUus</i> species group, although this is questionable, based on genetic data; further research is required, with larger sample sizes, to determine the placement of this species. <i>Rhinolophus chaseni</i> was previously treated as a subspecies of <i>R bomeensis but</i> is now recognized as a distinct species, based on genetic and morphological differences. Populations throughout much of mainland South-east Asia are attributed to this species, although Peninsular Malaysian specimens are tentatively placed in <i>R bomeensis</i> until the population is tested genetically. Monotypic. <b>Distribution.</b> Thailand, Laos, Vietnam (including Con Son in Con Dao Is), and Cambodia. Descriptive <b>notes.</b> Head-body 48-60 mm, tail 20-32 mm, ear 15- 9-22 mm, hindfoot 6- 4—10 mm, forearm 40- 7-49 mm; <i>weight</i> 5-7-14- 5 g. Island individuals are much smaller than those <i>of</i> the mainland but there is litde genetic variability between them. Pelage is uniformly dark brown to dark grayish brown dorsally, being very slighdy paler <i>ventrally</i>; no orange morph has been recorded. Ears are of medium size. Noseleaf has a somewhat shortened hastate lancet (nearly cuneate); connecting process is rounded; sella is <i>relatively</i> tall, slightly convex in front view, and lacks basal folds; intemarial cup is not expanded; horseshoe is of medium width, does <i>not</i> completely cover muzzle, has deep median emargination, and visible lateral leaflets. Lower lip has three mental grooves. Skull is <i>relatively</i> robust but small (zygomatic width larger than mastoid width), median nasal swellings are smaller and less inflated than in the Malayan Horseshoe Bat (. <i>malayanus)</i>, and lateral swellings are much larger. P2 is reduced <i>but</i> within tooth row, separating C1 and P4; P is moderate to small in size and <i>usually</i> completely displaced labially, allowing P2 and P4 nearly to touch. Habitat. Recorded <i>mainly</i> from tropical forest habitats, both primary and secondary, at elevations from sea level up to 530 m. Also commonly found in dry dipterocarp forests and disturbed areas with agricultural fields. <b>Food and</b> Feeding. Indochinese Horseshoe Bats are insectivorous. They forage by aerial-hawking and probably by gleaning from the ground or vegetation. Breeding. Breeding season in October and females probably give birth from mid- to late April to late May. Litter size is a single young. <b>Activity patterns.</b> The Indochinese Horseshoe <b>Bat</b> is nocturnal and probably uses primarily caves and hollow trees for day roosts, although it has also been recorded in drainage pipes. Call shape is FM/CF/FM and the peak F has been recorded at 77-5-78-5 kHz in Laos; and at 80 kHz in Tay Ninh and 102 kHz on Con Son Island in Vietnam. <b>Movements, Home range and Social</b> organization. Indochinese Horseshoe Bats roost in colonies. <b>Status and Conservation.</b> Not assessed on <i>The</i> IUCN <i>ed List</i> as a species separate from the Bornean Horseshoe <b>Bat</b> (<i>R</i>. <i>borneensis</i> <i>)</i>, which is classified as Least Concern. The Indochinese Horseshoe Bat seems to have a wide distribution and is common in certain regions (e.g. southern Vietnam). However, it is possibly threatened by roost disturbance and general habitat destruction. Further research into the species’ full distribution and its <i>ecology</i> is needed. <b>Bibliography.</b> Abramov et al. (2018), Borisenko &amp; <i>Kruskop</i> (2003), Csorba <i>et al.</i> (2003), Dang Ngoc Can et al. (2008), <i>rancis</i> (2008a), Francis et al. (2010), Kruskop (2010b, 2011, 2013 <i>a</i>, 2014), Lim et al. (2017), Matveev (2005), Thomas <i>et</i> al. (2013).
description: Published as part of <i>Burgin, Connor, 2019, Rhinolophidae, pp. 280-332 in Handbook of the Mammals of the World – Volume 9 Bats, Barcelona :Lynx Edicions</i> on page 309, DOI: 10.5281/zenodo.3748525