Monday, October 3, 2022

[Mammalogy • 2022] Myotis hayesi From Greener Times: A New Species of Thick-thumbed Myotis (Chiroptera: Vespertilionidae) from Phnom Penh, Cambodia

Myotis hayesi
Csorba & Furey, 2022

Hayes’ thick-thumbed myotis  |  DOI: 10.17109/AZH.

A new species of Myotis is described from Cambodia. The species is characterised by its fleshy, bicolored thumb, large foot sole, full dentition, relatively short rostrum, and high frontal part of skull. The species is currently only known from the city of Phnom Penh.

Keywords: Chiroptera, Cambodia, taxonomy, new species, Myotis sp. n.

Myotis hayesi sp. n.

Type locality – Phnom Penh, Cambodia, ... The holotype was collected in an urban area with scattered gardens planted with various species of palms and broad-leaved trees.

Diagnosis – A small species of Myotis (Table 2) with the forearm length of 33.8 mm and a skull length of 13.64 mm. The thumb, footpad, and calcar (including keel) are distinctly yellowish and contrast sharply with the overall brownish wing membranes. The thumb is shortened and thickened (Fig. 2). The sole of the hind foot is wide, smooth, and concave and its greatest width (measured at the base of the digits) exceeds the length of the longest digit (Fig. 3). The rostrum is relatively short, and the frontal part of the skull is elevated, although the braincase is not especially globose (Fig. 4). There are three upper and lower premolars, and the middle premolars are situated within the toothrow (Fig. 5).

 Etymology – Named after Benjamin Hayes, in recognition of his exceptional contributions to improving understanding and conservation of bats in Vietnam and Cambodia. The proposed English name is ‘Hayes’ thick-thumbed myotis’.


Gabor Csorba and Neil M. Furey. 2022. From Greener Times: A New Species of Thick-thumbed Myotis from Phnom Penh, Cambodia. Acta Zoologica Academiae Scientiarum Hungaricae. 68(1), 85-97.  DOI: 10.17109/AZH.