乐生活Squalus suckleyi larvae. This species is distributed in the Yellow Sea and Bohai Sea, and the reproductive mode is typical "placental fetal birth". Fertilized eggs develop in the uterus. Yolk sac is connected with the uterine wall of the mother to form yolk sac placenta. The mother provides nutrition for the later stage and produces larvae directly. (Fig. 3 shows its adults)
