Three major clades of deuterostomia is identified: Hemichordata, Echinodermata and Chordata. Therefore, deuterostomes belong to the indeterminate cleavage. Their cytoarchitectural features are undisturbed. They have either parallel spindle axes to the polar axis of the oocyte or right angles to the polar axis. In the absence of large yolk concentration, deuterostomes exhibit radial cleavage.
The coelom later develops into separated cavities. Longitudinal pouches of the archenteron forms the coelom of the deuterostomes. The early development of the gut is referred to as the archenteron in deuterostomes. Eventually, the gut is tunneled to form the mouth. In deuterostomes, the original blastopore develops into the anal opening. Examples for Ecdysozoa are arthropods and nematodes whereas molluscs, annelids, platyhelminths and rotifers are the Lophotrochozoas.ĭeuterostomes belong to the subtaxon: Deuterostomia of Bilateria. Protostomes can be further divided into two superphyla: Ecdysozoa and Lophotrochozoa. A solid, ventral nerve cord is found in protostomes. Thus, protostomes belong to the determinate cleavage. The developmental fate of the cells is determined during the early development of embryo. Equal spiral cleavage is the most occurring and sometimes they undergo unequal cleavage. Some phyla of protostomes exhibit spiral cleavage in the absence of large yolk concentration. The coelom cannot be identified in some protostomes such as Priapulids. A solid mass of the embryonic mesoderm of protostomes splits to form a coelom. Some bilaterian animal forms such as Acoelomorpha, consist of a single mouth with no anus. The anal opening is formed secondly by the tunneling of the gut through the embryo. During the development of the gut, protostomes first develop the mouth from the dent, blastopore. In protostomy, the blastopore forms the mouth of the protostomes. Protostomes belong to the clade Nephrozoa of Bilateria. What is the difference between Protostomes and Deuterostomes Both Protostomia and Deuterostomia forms the clade: Nephrozoa.ģ. The main difference between protostomes and deuterostomes is that in protostomes, the blastopore is developed into the mouth whereas in deuterostomes, the blastopore is developed into the anal opening. The main difference between protostomes and deuterostomes originates from the development of their blastopore, a transient opening of the archenteron to the exterior of the embryo at the gastrula stage, which is related to the later development of mouth or anal openings. Protostomes and Deuterostomes are two clades of animals that make up the Bilateria, a clade of subkingdom: Eumetazoa, which consists of animals composed of bilateral symmetry and three germ layers. Main Difference – Protostomes vs Deuterostomes
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