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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).
1 Animals whose blastopore becomes the mouth are known as protostomes (from the Greek proto, meaning first and stoma, meaning mouth)  Animals whose blastopore becomes the anus (with a secondary opening becoming the mouth) are known as deuterostomes (from the Greek deutero, meaning second and stoma, meaning mouth)