Phylotypisches Stadium

The phylotypic stage is a development stage during embryonic development in animals, especially in vertebrate animals, in which embryos of the different classes of an animal strain strongly resemble each other. At this stage, the different members of an animal tribe show a high degree of consistency in their morphology and internal organization.

The similarities during embryonic development were first established by Karl Ernst von Baer early in the 19th century and recognized by Friedrich Seidel in the 1960s. This stage, in which the body shape with neural tube, chorda, somites, pharyngeal pockets, and ventral heart tubes is for the first time recognizable, was called "phylotypical stage" in 1983, according to a suggestion of the developmental biology and zoologist Klaus Sander (Phylum) is typical. Edit source text

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