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13 October 2020 Acoustic Detection of an Unknown Bat Species in Okinawa
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Pipistrelles of the genus Hypsugo are among the rarest bats in Japan, known from a handful of records. In June 2018, a sequence of echolocation calls apparently by a bat of this genus was recorded by an automatic ultrasound recorder on the island of Okinawa. The calls closely resemble H. pulveratus, a Chinese species never before recorded in Japan, and H. alaschanicus, a very rare species in Japan. They also resemble calls of Hypsugo sp. bats from a small population recently discovered on nearby Amami-Oshima Island. The extreme rarity in our recordings, combined with lack of detection in Okinawa by other surveys, suggests that the individual was a vagrant. However, given the cryptic nature of the species on Amami, it remains possible that there is a small and likely endangered resident population, underlining the need for further bat surveys on Okinawa and other Nansei Islands.

© The Mammal Society of Japan
Vladimir Dinets, Nicholas R. Friedman, Masashi Yoshimura, Masako Ogasawara, and Evan P. Economo "Acoustic Detection of an Unknown Bat Species in Okinawa," Mammal Study 45(4), 353-356, (13 October 2020).
Received: 20 November 2019; Accepted: 16 July 2020; Published: 13 October 2020

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