The sausage-mouthed frog is called the Green Mouth Frog, also known as the Tree Frog. It is a genus of anuran tree frogs in the family Tree Frogs, whose bodies are elongated and flattened, with long hind limbs, large suckers, and well-developed webbing between the fingers and toes, which can be used to glide through the air. Tree frogs are mainly produced in Asia and the southern half of Africa in tropical and subtropical areas, living in the broad-leaved forests in mountainous areas at an altitude of less than 1,000 m. The breeding period is longer, from May to August, the male frogs will emit a song, the tadpoles live in forested areas within the static ponds in mid-August can be seen in the young frogs have just completed the metamorphosis.

Morphological features of the sausage-billed frog

The snout bone is small, the butterfly sieve bone is exposed, the frontal parietal bone is wide or wide and short, and some species have a secondary dermal plate that covers the lateral side of the frontal parietal bone or squamosal bone, the hyoid bone has no lingual angular proptosis, and there is pterygoid protuberance, and the laryngeal apparatus ring cartilages have or do not have a lateral protuberance, and the vertebral body is anteriorly concave or senate-type, and the scapular sternum is basal forked, and the mesothoracic sternum is thin and long. longer than rostral bones, finger and toe end bones Y-shaped.

The cartilage is rhombic or cordate or pterygoid, the third metacarpal has a nodule at the distal end, the body is medium or large, the male frogs generally have a slanted tip at the end of the muzzle, the Wuche's tube is curled, and there is no bottle-like spermathecae. Apparently different from females, the posterior end of the tongue is y notched, the plow teeth are well developed, the tympanum is obvious, the interphalangeal webbing is webbed or well developed, the interphalangeal webbing is nearly fully webbed or fully webbed, and the webbing between the lateral paces is more developed.

Part of the species has skin folds on the forearm and heel or above the anus, the first and second fingers are not opposite to the third and fourth fingers and do not form a grip, the suckers and marginal grooves at the ends of the fingers and toes are obvious, and Y-shaped traces are visible on the back of the suckers. The tadpoles are medium-sized, with the mouth on the ventral surface of the muzzle end, the eyes located on the dorsal side of the head, and the caudal fins are mostly low and flat, and generally bluntly pointed at the end.

Most species are arboreal, and the female frogs produce smaller and more numerous egg grains, with egg diameters ranging from 1.5 to 3mm, and egg production of about 400 grains in general, and more than 4000 grains in some cases, with most of the grains milky yellow in color. The egg masses are foamy, attached to plants on the edge of the pond or in the mud nests, or hanging on the branches and leaves over the pond. The tadpoles live in still waters.

The genus has more species, about 60 kinds of 2007 statistics for 74 species, distributed in the eastern and southern subtropical and tropical regions of Asia. China now has about 25 species, distributed in the provinces and regions south of the Qinling Mountains, with more tropical and subtropical species.