Metameric features in the Vendian metazoans

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Abstract
Metamerism as the serial homology is widespread among the Vendian (Late Precambrian) metazoans. Prevalence of segmented forms among the Vendian Bilateria suggests that in many phylogenetic lineages of Metazoa the evolutionary development of the bilateral symmetry and metamerism were related processes. Large number of coelenterate‐grade forms with serially homologous parts may indicate that at the earlier, pre‐Vendian stages of the metazoan history metamerism could be at great extent realised at the diploblastic level.