At 21-30 h (Fig. 4E-F), the external appearance of the embryo already resembles the juvenile female. Towards
21 h, the second molting occurs, and right after this molting, the organs are developed and embryos can actually
move and swim around. The movements (wriggle and tremble) is in a way similar to an adult; however, the
embryo cannot swim. It is difficult to observe further modifications due to the constant movement of the embryo
at this point. We could discern the rostrum, the brood pouch and setae on the limbs of adult type (Fig. 4F).
Brownish yolk blocks are present only in the dorsal portion, surrounding the digestive tract.