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Figure 1 | EvoDevo

Figure 1

From: Cleavage pattern and fate map of the mesentoblast, 4d, in the gastropod Crepidula: a hallmark of spiralian development

Figure 1

Diagram showing the cleavage pattern of 4d in C. fornicata. (A-B) Initial formation of 4d at the 25-cell stage and its subsequent cleavage to generate two symmetrical teloblasts, ML and MR. (C-J) Subsequent divisions forming the first six pairs of daughter cells, 1mL/R through 6mL/R. The nomenclature used to identify individual progeny is based on that previously proposed by Henry et al. [22] and described in the text. The views in A-C are animal pole views with the dorsal surface of the embryo located towards the bottom of the illustration. The views in D-I are dorsal views. The view in J is a ventral view, where the location of the blastopore is shown. Dashes connect sets of sister cells that have just divided. The relative orientation of the animal-vegetal axis is also shown in D and applies to parts D-I. This relationship is inverted in J as the embryo has been flipped upside-down. Note how the positions and orientation of these cells (bands) change as the embryo undergoes gastrulation and epiboly. A-V: animal –vegetal axis; BP: blastopore.

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