The dorsal surface of the baby giant salamander is light brown-red, the whole body is covered with small melanocytes, the head is slightly bent to the ventral surface, there are a pair of nostrils at the snout of the maxilla in front of the head, and there are a pair of small dark eyes on the dorsal side in front of the head, which are respiratory organs.
There are fluffy pink whiskers 14- 15 bundles on each branchial branch, and the outer branchlets will gradually disappear after the lung is formed. Because of the large yolk sac in the abdomen, the abdominal cavity is in the shape of a long oval bag, and the yolk substance accumulated in the sac is the nutritional source after birth.
The forelimbs and hind limbs, as motor organs, are not yet complete, so they can't keep their balance in the water. When they are not active, they lie on their side at the bottom of the water. However, the tail is relatively developed, and it can make irregular movements by swinging the tail. Larvae grows slowly and feeds on plants within 2 years old.
Extended data:
Giant salamander breeds from May to August every year, and it is difficult to distinguish its male from female in appearance. Only during the breeding period can it be identified by the difference of the cloacal holes. There is a circle of prominent white milk spots on the inner periphery of the male cloacal hole, and the surrounding of the hole is congested and red, while the muscles of the female cloacal hole are slack.
The breeding of giant salamander is mainly in vivo fertilization, and the males can't sing, and there is no "cuddling" and mating behavior between the sexes, but the courtship performance of males is also very eye-catching.
Take the opportunity to discharge the milky seminal vesicle and slowly sink to the bottom of the water. The female buckles the seminal vesicle with the lip of the cloaca, and then sucks the sperm into the body and stores it in the fallopian tube, waiting for it to join the egg and fertilize, while the colloidal capsule of the seminal vesicle is abandoned to the outside.