A protostome, also called Protostomia is a phylum under Kingdom Animalia (animals). Protostomia, group of animalsincluding the arthropods (e.g., insects, crabs), mollusks (clams, snails), annelid worms, and some other groupsclassified together largely on the basis of embryological development. The major distinctions between deuterostomes protosomes are invertebrates whereas deuterostomes Have chordates. Together with the deuterostomes and xenacoelomorpha, its members make up the Bilateria, mostly comprising animals with bilateral symmetry and three germ layers. Protostomia (from Greek - proto- "first" and stoma "mouth") is a clade of animals. Which of the following is descriptive of protostomes? Both protostomes and deuterostomes are a part of the group Bilateria. The study of phylogeny aims to determine the evolutionary relationships between phyla. Protostome definition, any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm. Protostomes are the organisms that have bilateral symmetry and have the presence of three germ layers. One group grows through incremental additions to the body, the other by molting, or shedding, an exoskeleton. The major distinctions between deuterostomes and protostomes are found in embryonic development and is based on the embryological origins of the mouth and anus. Compare and contrast the embryonic development of protostomes and deuterostomes.
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