Description
Rana ornativentris is a broad bodied frog. The mean snout to vent length for males is 48 mm (range 42 - 60 mm), and for females it is 68 mm (range 36 - 78 mm). The canthus is blunt, and the tympanum is circular. This species has 3 - 7 vomerine teeth. The tips of the fingers and toes are blunt, and the webbing is well developed. The skin on the back of this species is slightly rough because of the small tubercles or granules. There is a pair of vocal sacs and openings at the corners of the mouth (Maeda and Matsui 1990).

The males have a silver-gray colored throat and nuptial pads that are grayish brown (Maeda and Matsui 1990).

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Japan

	View distribution map in BerkeleyMapper.
	View Bd and Bsal data (6 records).

The species is found on the islands of Honshu, Shikoku, Kyushu, and Sado in Japan. Rana ornativentris inhabits plains, hillsides, and mountainous regions that are up to 1,900 m (Maeda and Matsui 1990).

Life History, Abundance, Activity, and Special Behaviors
This species has a mating call that lasts 0.5 seconds with 5 - 6 distinct notes. The breeding period is between January and late June, generally in rice fields, small pools, and marshes. 1,000-1,900 dark brown colored eggs are laid, which are 1.5 - 2.4 mm in diameter (Maeda and Matsui 1990).

The food it eats includes insects, snails, earthworms, and slugs (Maeda and Matsui 1990).

Comments
Rana ornativentris is karotypically unique because it only has 24 diploid chromosomes (Maeda and Matsui 1990).

References

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

Species Account Citation: AmphibiaWeb 2023 Rana ornativentris: Montane Brown frog <https://amphibiaweb.org/species/5119> University of California, Berkeley, CA, USA. Accessed Nov 23, 2024.

Citation: AmphibiaWeb. 2024. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 23 Nov 2024.

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