![]() This developmental biology article is a stub. Deuterostomes have what is known as radial cleavage that is indeterminate.Protostomes have what is known as spiral cleavage which is determinate, this meaning that the fate of the cells is determined as they are formed.In protostomes, the blastopore develops into the mouth, and in deuterostome, it develops into the anus. Which of the following model organisms would you NOT select for your study C. The primary difference between the protostomes and the deuterostomes is in the embryonic development of blastopore. In deuterostomes the blastopore becomes the 4. ![]() In deuterostome development, the blastopore becomes the animal's anus. In protostomes the blastopore becomes the 2.In protostome development, the first opening in development, the blastopore, becomes the animal's mouth.The major distinctions between deuterostomes and protostomes are found in embryonic development: Protostomia and Deuterostomia are considered super-phyletic taxa, each containing a variety of animal phyla. Protostome derives from the Greek word protostoma meaning "first mouth"(πρώτος + στόμα) whereas Deuterostome's etymology is "second mouth" from the words second and mouth (δεύτερος + στόμα). Animals in which the blastopore becomes the mouth are called protostomes those in which the mouth develops after the anus are called deuterostomes (from the Greek 'deutero,' meaning second, and 'stoma,' meaning mouth). The distinction between protostomes and deuterostomes is based on the direction in which the mouth (stoma) develops in relation to the blastopore. Protostomes have what is known as spiral cleavage which is determinate, meaning that the fate of the cells is determined as they are formed. In deuterostome development, the blastopore becomes the animal's anus. A blastopore is an opening into the archenteron during the embryonic stages of an organism. In protostome development, the first opening in development, the blastopore, becomes the animal's mouth.
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