Deuterostome phyla of Echinoderm animals and Hemichordate animals are both comprised of marine species.
Deuterostomes are organisms (i.e., animals) in which the anus appears first than the mouth in the embryos.
Embiologically, the development of Deuterostomes involves the formation of a structure called the blastopore.
Deuterostomes emerged after protostomes, which represents an evolutionary older lineage.
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