Phylotypic stage

The phylotypische stage (ger .: phylotypic stage ) is a development stage during embryonic development in animals, particularly in vertebrates to embryos in which the different classes of animal strain similar. At this stage the different members of an animal phyla show a high degree of correspondence in their morphology and internal organization.

The similarities during embryonic development were first noted by Karl Ernst von Baer early in the 19th century and recognized by Friedrich Seidel in the 1960s. This stage, at which the basic shape of the body with the neural tube , chorda , somites , pharynx and ventral heart tube is recognizable for the first time, was called the “phylotypic stage” in 1983 after a suggestion by the Freiburg developmental biologist and zoologist Klaus Sander , that is, the stage for an animal strain ( Phylum ) is typical.

literature

• Werner A. Müller, Monika Hassel: Developmental and reproductive biology of humans and animals . Springer, Berlin 2005, ISBN 3-540-24057-8