Motivated by the discovery of segmental epithelial coeloms or head cavities in elasmobranch embryos toward the end of the 19th century the debate over the presence of mesodermal segments in the vertebrate head became a central problem in comparative embryology the classical segmental view assumed only one type of metamerism in the vertebrate head in which each metamere was thought . Developmental morphology of the head mesoderm and reevaluation of segmental theories of the vertebrate head evidence from embryos of an agnathan vertebrate lampetra japonica shigeru kuratani1 naoto horigome and shigeki hirano department of biology okayama university faculty of science okayama japan and department of anatomy niigata university school of medicine niigata japan. Shigeru kuratani of kobe university kobe shindai with expertise in zoology marine biology developmental biology read 316 publications and contact shigeru kuratani on researchgate the professional network for scientists. Attainment of the biting jaw is regarded as one of the major novelties in the early history of vertebrates based on a comparison between lamprey and gnathostome embryos evolutionary developmental studies have tried to explain this novelty as changes in the developmental patterning of the
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