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Figure 1 | Frontiers in Zoology

Figure 1

From: Development to metamorphosis of the nemertean pilidium larva

Figure 1

Early cleavage in Micrura alaskensis. DIC images. A. Unfertilized egg undergoing germinal vesicle breakdown. B. Fertilized egg with the first polar body. C. Formation of the second polar body. D-F. First cleavage. D. Broad initial cleavage furrow. E. There is no egg chorion, and the blastomeres separate almost completely. F. Embryo re-compacts after first cleavage. G. Polar view of the four-cell stage. H. Vegetal view of an eight-cell stage illustrating dextral spiral cleavage. I. Side view of an eight-cell stage. Apical pole, marked by polar bodies, is up. Animal micromeres are larger than the vegetal macromeres.

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