![]() ![]() The classification of these three groups is based on the data of the recent molecular studies on the embryonic development of protostomes. In addition, there are three major groups within protostomes: Superphyla: Ecdysozoa, Platyzoa, and Lophotrochozoa. Cells formed through the spiral cleavage are determinate, which means the fate of each cell formed is resolute. There are only very few groups such as Priapulids that do not have a coelom.Īnother most prominent characteristic of protostomes is that their embryos undergo spiral cleavage. Among most of the protostomes, the coelom is formed via splitting a solid mass of the embryonic mesoderm hence, they are called schizocoelomates. Protostomes include animals such as Platyhelminthes, Molluscs, Arthropods, Annelids, Nematodes, and many other lower phyla. In other words, the small pore formed during the embryonic developments becomes the mouth in the animals of this type. Protostomia in Greek means the mouth first, as the blastopore eventually becomes the mouth in protostomes. Side by Side Comparison – Protostomes vs Deuterostomes in Tabular Form Similarities Between Protostomes and Deuterostomesĥ. They primarily differ in the way their mouth and anus are formed during embryonic developments. Protostomes and deuterostomes are the two main types of coelomate animals, and there are many differences between them. It would be particularly important to consider animals with a coelom, which is a fluid-filled cavity lying between endoderm (gut) and mesoderm (mostly muscle layer) in other words, coelom is the peritoneum in mammals. In understanding these two terms it would be important to pay attention to how the embryonic development of organisms takes place. Another major difference is that embryos of protostomes undergo spiral cleavage while embryos of deuterostomes undergo radial cleavage. The key difference between Protostomes and Deuterostomes is that in protostomes blastopore becomes the mouth while in deuterostomes it becomes the anus.
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