Rana neba Ryuzaki, Hasegawa & Kuramoto, 2014
Subgenus: Rana | family: Ranidae genus: Rana |
Species Description: Ryuzaki M, Hasegawa Y, Kuramoto M 2014 A new brown frog of the genus Rana from Japan (Anura: Ranidae) revealed by cytological and bioacoustic studies. Alytes 31: 49-58. |
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Description Relative length of the fingers are 2 < 1 < 4 < 3. The fingers are free with subtle rounded tips. The first finger is bent inwards towards the middle. Two nuptial pads are found with one on the inner side of the base of the first finger and the other with on the upper side of the middle part of the first finger (males). Inner side of arms is very thick. Subarticular tubercles are well developed and there are two, distinct palmar tubercles (Ryuzaki et al. 2014). Relative length of the toes are 1 < 2 < 5 < 3 < 4. Toe tips are small and rounded. The hind limb is approximately 1.6 times longer than the snout-vent length. The femur is a little smaller than the tibia. When the legs are folded at a right angles to the body axis, the tibio-tarsal articulations overlap slightly. When the hind limbs are stretched forward along the body axis, the tibio-tarsal articulations reach the eye (Ryuzaki et al. 2014). Rana neba is distinguished from its sibling species, Rana tagoi, through small differences in morphological components and by its advertisement call. Compared to R. tagoi, the snout to nostril distance is larger and there is smaller webbing on fingers 4, and toes 4 and 5. The advertisement calls of R. neba is of higher frequency and the calls of R. tagoi are of lower pitch (Ryuzaki et al. 2014). In life, the dorsal side is reddish brown. The ventral side is white with small grey dots from throat to venter. Upside-down black triangles are found between eyelids and upside-down black V found behind the triangle (males). Cross black bands are on forearms, thighs, tibias, and feet. Sides of canthus rostralis and tympanic area are both black. Both upper jaw and nuptial pad are white (Ryuzaki et al. 2014). Rana neba exhibits sexual dimorphism. Male characters include: presence of nuptial pad, thick forearm, more developed palmar tubercles, upended black triangle mark between eyelids, and upended black V mark on the back behind the head. Females characteristics include: no distinct black marking on the top side, less conspicuous cross bars on the thigh, tibia, and tarsus, and mottling pattern of reddish and yellowish brown on the top side. Light and black mottling pattern vary on the bottom side for both males and females. Size does not appear to differ between the sexes (Ryuzaki et al. 2014). Distribution and Habitat Country distribution from AmphibiaWeb's database: Japan
Life History, Abundance, Activity, and Special Behaviors Trends and Threats Comments Rana neba may possibly hold two characteristics that are unique to them: the 2n = 28 karyotype and the high-pitched advertisement call (Ryuzaki et al. 2014).
References
Ryuzaki, M., Hasegawa, Y., Kuramoto, M. (2014). ''A new brown frog of the genus Rana from Japan (Anura:Ranidae) revealed by cytological and bioacoustic studies.'' Alytes, 31, 49-58.
Species Account Citation: AmphibiaWeb 2015 Rana neba <https://amphibiaweb.org/species/8277> University of California, Berkeley, CA, USA. Accessed Dec 3, 2024.
Citation: AmphibiaWeb. 2024. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 3 Dec 2024.
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