Figure 1 in Five invaginations and shedding of the larval epidermis during development of the hoplonemertean Pantinonemertes californiensis (Nemertea: Hoplonemertea)

Figure 1. Cleavage in Pantinonemertes californiensis. (A) Fertilized egg in egg envelopes; (B) first polar body formation; (C) second polar body formation; (D) two-cell stage; (E) four-cell stage; (F) eight-cell stage; (G) 16-cell stage; (H) 32-cell stage. Scale bar 100 µm.