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Depending on the species, the blastopore has been reported to become the mouth (protostomy), the anus (deuterostomy), both mouth and anus (amphistomy), or neither (i.e., the blastopore closes).
This blastopore-to-anus developmental pathway is found in Chordata, Hemichordata, Echinodermata (starfish, sea urchins, sea cucumbers, etc.), uniting these groups into a monophyletic group called the Deuterostomes. The plesiomorphic condition, found in the Protostomes, is for the blastopore to become the mouth. Gastrulation in Amphioxus â¢ begins by the flattening of the blastula, loss of the blastocoel, and formation of the archenteron - the embryonic gut cavity that is lined with endoderm.