Teloblasty

preanal budding zone in a larva

With Teloblastie (. Greek τέλος = target end; βλαστος = seed, scion) or teloblastischer segment formation is in the Zoology means a development process in which a Sprossungszone starting from the rear to the front, the formation of new segments ( metameres takes place). This zone is called the preanal budding zone. Through repeated division of terminal stem cells , the teloblasts , both ectoderm and mesoderm ( coelom ) can be formed at this point .

Teloblasty is characteristic of the development of all articulata . In the trochophora larva of the articulata, this growth zone develops between the episphere and the hyposphere. The episphere later becomes the prostomium, which corresponds to the acron of the arthropod ; the pygidium , corresponding to the telson of the arthropod, develops from the hyposphere of the larva , both without coelom spaces. The sprouting zone in front of the pygidium creates new segments that contain paired coelom spaces ("Coelom sacs"). The homonomous segmentation of annelids , for example, is the result of teloblasty.

In the sprouting zone in front of the pygidium, pluripotent cells are formed which initially aggregate, then diverge in the course of their further genesis and thus form the new segments with the paired coelom spaces ("Coelom sacs"). The approximately homonomous segmentation of annelids , for example, is the result of teloblasty.