1. The chrysalis is invaginated.

2. The acrosomal plate is a thickening of the acrosomal lamella, which is mostly invaginated into the posterior part of the spermatozoon as an acrosomal channel.

3. A, Blastula stage (one-cell-layered eaten its way into the in sac), with commencing invaginated endodermal sac, vagination of the wall of the and the cells pushed in with sac at bl, the blastopore