Japanese tree frog

Japanese tree frog ( Hyla japonica)

The Japanese tree frog ( Hyla japonica ) is a species of amphibian in the genus of tree frogs (Hyla ).

Features

The Japanese tree frog is a small Froschlurch, which reaches a head-body length of 30 to 52 mm. His eyes are bigger than the diameter of the eardrum. The mostly green body top is smooth-skinned, the whitish underside, however, is granulated fine-grained. On the flanks runs a dark longitudinal stripes, which decays into regular spot pattern, and may be partially reduced. The Japanese tree frog is very similar to the European tree frog ( Hyla arborea ). This is also true for the outer distinction between males and females, which focuses on the coloration of the throat: In the males the throat is brownish and wrinkled - due to the vocal sac located there - the female, however, smooth and bright Unlike Hyla arborea is found in the Japanese tree frog a dark upper lip stain underneath the eye, a so-called " hip sling " is missing and the hind legs are relatively short.

One female produced in 341-1448 eggs. The nest consists of one or a small spawn clumps, each containing 5 to 100 eggs. The diameter of the eggs is without egg case from 1.1 to 1.5 mm, with egg case from 3.3 to 5.5 millimeters. The tadpoles have a total length of 4 to 5 mm at hatching. Until the onset of metamorphosis they reach 35 to 45 millimeters in length. The visceral sac of the larvae is only slightly or not at all through the abdomen recognizable. Immediately after landfall is the head-body length of young frogs 10 to 16 millimeters.

Occurrence

The distribution area of the Japanese tree frog includes Japan, Korea, northeastern and central China, the North of Mongolia and the Russian Far East to the south of Lake Baikal. In Russia the species is selectively found in the south of Sakhalin Island, South Primorye and the current valleys of the Amur and Ussuri the.

System

The internal system of the type is hardly been studied, it is believed that there are two or more sub- types. From Russia Hyla japonica was ssp. Stepheni Boulenger, 1887 described. This differs from the nominate form by its short lower leg.