Babina subaspera
Otton frog
family: Ranidae

© 2005 Timothy Johnson (1 of 2)
Conservation Status (definitions)
IUCN (Red List) Status Endangered (EN)
Other International Status None
National Status None
Regional Status None



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This species is robust and has a large body. The canthus is sharp, and the tympanum is elliptical. There are 5-6 vomerine teeth. The tips of the fingers and toes are dilated. The hindlimb webbing is moderate. The skin on the back has various-sized warts. The mean snout to vent length for both males (range 93-126) and females (range 111-140) is 117 mm. A subgular vocal sac and a pair of vocal openings are located on the inner sides of the mouth. Males have a throat and venter covered with granules and nuptials that are poorly developed and contain white spinules.

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Japan


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R. subaspera Is found on Amamioshima and Kakeromajima Islands in Japan. It inhabits hillsides or mountainous regions.

Life History, Abundance, Activity, and Special Behaviors
Approximately 1,300 eggs are laid by each female. The eggs are brown and with a diameter of 2.0-2.5 mm. The mating call is one note that lasts for 0.5 seconds. This species breeds from late April to late August near small pools on forest trails and muddy riverbeds. This species eats insects, snails, and crabs.

This species is often thought to be part of the genus Babina because of its elongated first metacarpal.


Maeda, N. and Matsui, M. (1990). Frogs and Toads of Japan, 2nd edition. Bun-Ichi Sogo Shuppan Co., Ltd., Tokyo, Japan.

Written by Ambika Sopory (shambika AT, UC Berkeley
First submitted 2001-10-26
Edited by Vance Vredenburg (2001-12-18)

Species Account Citation: AmphibiaWeb 2001 Babina subaspera: Otton frog <> University of California, Berkeley, CA, USA. Accessed Feb 16, 2020.

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Citation: AmphibiaWeb. 2020. <> University of California, Berkeley, CA, USA. Accessed 16 Feb 2020.

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