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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).
Best Answer: 4 key characteristics identify the protostomes from the deuterostomes. Protostomes have: 1. In early development, the original blastopore became the mouth (in deuterostomes it became the anus).2. Schizocoelus development of the coelom-the mesoderm, and coelom, initially develop from a solid block of mesoderm tissue that develops a split down the middle.nswers. Best Answer: 4 key characteristics identify the protostomes from the deuterostomes. Protostomes have: 1. In early development, the original blastopore became the mouth (in deuterostomes it became the anus). 2.