The embryonic development of deuterostomes goes through radial cleavage. While the blastula is forming via cleavage of the embryo, the cell division process occurs in radial. In this group of animals, the initial cavity created by the blastopore matures as anus of the organism. Also, the mouth of the concerned organism is created on the other side after the formation of the anus.
Based on the similarities of structure, the following clades of deuterostomia animals are available-
Echinodermata is exclusively identified as marine animals. The adult echinoderms are recognisable by the radial symmetry.
Example: Sea cucumbers, Starfish, Sand dollars, Sea lilies, etc.
Chordates include both terrestrial and marine animals.
Example: Frog, Tiger, Bat, Turtle, Snake, Jawless fish, etc.
Cephalochordata are small marine organisms with a segmented body.
Urochordata is also sea animals and known as Tunicata.
Example: Sea squirts, Thaliacea, Ascidians, Larvacea, etc.
Vertebrata includes all animals that fall under subphylum vertebrate.
Example: Human, Birds, Amphibians, Fishes, etc.
Hemichordata is a marine species and can be grouped as sister organisms of echinoderms.
Example: Graptolithina, Acorn worm, Pterobranchia, etc.
Protostomes include the lower invertebrate species in which the formation of mouth happens before the creation of anus during embryo development. These animals have determinate and spiral cleavage and through the dividing of mesoderm their coelom forms.
Some examples of protostome are octopus, squid, snail, centipedes, millipedes, spiders, butterflies, ants, bees, earthworms, clams, oysters, etc.
Thus, the fundamental difference between protostomia and deuterostomia animals is the conversion of blastopore into the mouth or anus.
Thus, the difference between protostomes and deuterostomes lies in the position of their organs. In deuterostomes, the blastopore transforms into an anus, and another cavity on the opposite side creates a mouth. However, in protostomes, the mouth is created from the blastopore.
To learn about the difference between protostomes and deuterostomes in-depth, go through the study materials available in Vedantu’s website. For quick learning, download our Vedantu app.
1. Are Human Deuterostomes?
Ans. Yes, human are deuterostomes.
2. What is the Definition of Deuterostome Definition?
Ans. During the embryonic development of metazoans, if the blastopore turns into the anus, the animals are called deuterostomes.
3. What is Protostome?
Ans. In the time of embryonic development, if the primary cavity turns into a mouth, the animals are called protostomes.