Figure 9

Sub-cellular structures that can be observed temporarily during early development have been previously described in other crustaceans. A The end of the 2nd division of Polyphemus pediculus after [17]. The ncr lies adjacent to the D nucleus. B The 2nd division in metaphase in B. longimanus with the ncr. C’-C”’ The cyclic appearance of the granules during a cell cycle in P. pediculus after [17] exemplified by a mitosis of a cell at the late blastula stage. D-D” Granules in the copepod Cyclops strenuus during a cell cycle after [60]. D At the telophase of the first division the granules gathered around one pole of the mitotic spindle start to disappear and are not visible at the 2-cell stage in D’. D” During the next cycle the granules reappear at one pole during the initial metaphase. E-E” In Cyclops viridis[24] the granules are detected in more than only one mitotic pole (arrow heads in E and E’) or even in more than one cell during the first three divisions (arrow heads in E”).