what phyla are protostomes
Protostomes include the phyla Mollusca, Annelida and Arthropoda. Deterostomes include the phyla Echinodermata, Hemichordata and Chordata. Gastrulation in protostome and deuterostome embryos. In protostomes, the initial site of ingrowth or invagination (blastopore) becomes the mouth.hyla with a true coelom and digestive system are divided into two groups, the protostomes and the deuterostomes. As the hollow sphere of cells known as a blastula develops, an invagination produces an opening called the blastopore.