rana cancriuvora gravenhorst
Alias cynomolgus frog, frog land and sea, the English name of crab eating frog
Domestic distribution in Taiwan, Guangdong, Macau, Hainan, Guangxi. Foreign distribution in the Philippines, Indochina, Indonesia and Timor.
Body length of 60-78 mm. Head length is equal to or slightly greater than the first width. Snout blunt, kiss round edges, not very significant. Eardrum large and obvious. Vomer teeth strong, deep notched tongue backend. Short forelimbs, hind legs thick and short. Back skin rough. Back brownish yellow, with dark brown on the back and side stripes on the lower lip has 6-8 dark vertical lines. Between the eyes "a"-shaped spots. Forelimb back shoulder "ll" shaped plaque significantly, there is an overt or covert behind the "^" shaped spots.
Living near the sea or brackish saltwater areas. Generally do not exceed the scope of its activities saltwater environments 50-100 meters outside, so called "sea frog." Since it mainly feeds on crabs, also known as crab-eating frog. This frog during the day hidden in caves or among mangrove roots in the evening to the beach for food.
Sea frog body has special physiological mechanism, not only the body of water will not penetrate the outside, but the sea water will penetrate the body through the skin, so that the body maintain a high osmotic pressure, can tolerate salt concentration of 2.8%, Frogs in general more than 1% salt concentration in seawater can not survive, so the sea frog can live freely in the sea, free.
Sea frogs during the breeding season, often adapted to local conditions in the sea puddles spawning pond, puddle brunt of the sun makes the sea pond temperature rises above 40 ℃. However, sea frog eggs and tadpoles can endure high temperature according to the sun, which is unique in the realm of frogs. Not only that, tadpoles stronger than sea salt frogs, 12 hours after the water containing 80% sodium chloride living only 30% mortality rate.
Animal studies by geographers, frogs live in the sea, Hainan Island is the most northern regions of its distribution, and life in Southeast coastal sea frog, originally "family." But why now two miles apart, and the frog is not far from the sea coast, can only live on the beach within 50 meters of the coast. So, Hainan Island of China's sea frog is how come? Some scientists believe that China's Hainan Island and Leizhou Peninsula was connected to the mainland, but also with the Southeast coast of the piece. Frog along the sea coast north to Hainan in Indochina foraging area activities, and later, the crust changes, rising sea levels, Hainan Island, isolated in the sea, sea life along the coast of Hainan Island frog, from the sea on the Southeast coast of frog "brothers" across the ocean across the north and south of separation. |
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