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Evolutionary implications of the mode of D quadrant specification in coelomates with spiral cleavage. J.

Cleavage patterns and mesentoblast formation in the Gastropoda: an evolutionary perspective

Our recent research has focused on the development of two cell lines typical of the Spiralia (i.e., phyla with spiral cleavage): (1) the stem cell of the mesodermal bands (the mesentoblast) and (2) the trochoblasts.

Changes in cell lineage specification elucidate evolutionary relations in Spiralia

Spiral cleavage, which characterizes the embryos of phyla belonging to the Spiralia, typically involves the generation of four quartets of micromeres from the four macromeres produced by the first and second cleavages.

Modified spiral cleavage: the duet cleavage pattern and early blastomere fates in the acoel turbellarian Neochildia fusca

In particular, remarkable similarities in their embryonic cleavage pattern (spiral cleavage) and cell lineages have been observed (1, 2).

The origins of mesoderm in the equal-cleaving nemertean worm Cerebratulus lacteus

These animals share many common features of embryonic development including a stereotypic pattern of cell divisions referred to as spiral cleavage. In most molluscs and annelids, first cleavage occurs oblique to the future plane of bilateral symmetry and generates two blastomeres, designated AB and CD.

Axial specification in a basal member of the spiralian clade: lineage relationships of the first four cells to the larval body plan in the polyclad turbellarian Hoploplana inquilina