The segmentation ends with the formation of an epibolic gastrula.
The epibolic gastrula of the Scorpion, of Isopods, and of other Arthropoda, seems also to be a derived gastrula.
In ova with a partial segmentation there is usually some modification of the epibolic gastrula.
In Clepsine there is an epibolic gastrula, and mesoblastic bands like those in Euaxes are also formed.
epiboly e·pib·o·ly (ĭ-pĭb'ə-lē)
The growth of a rapidly dividing group of cells around a more slowly dividing group of cells, as in the formation of a gastrula.