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Figure 2   A phylogenetic tree of the gastropods. The Caenogastropoda and Heterobranchia have emerged as different branches from archaegastropoda, and the Neritimorpha have diverged from the Caenogastropods. The correlation between evolutionary divergence and the timing of mesentoblast specificity is seen. (After van den Biggelaar and Haszprunar 1996.)

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