are protostomes vertebrates
THE VERTEBRATES Chordates (phylum Chordata) are deuterostome coelomates whose nearest relatives in the animal kingdom are the echinoderms, the only other deuterostomes. However, unlike echinoderms, chordates are characterized by a notochord, jointed appendages, and segmentation. On the basis of embryonic development, metazoans are divided into Protostomia and Deuterostomia. Protostomes are primitive invertebrates while deuterostomes include echinoderms and chordates. This division helps in understanding relationships of different groups of animals. Protostomes (mollusks, annelids, and arthropods) develop so that the first opening in the embryo is the mouth (protostome = first mouth). Protostomes are bilaterally symmetrical, have three germ layers, the organ level of organization, the tube-within-a-tube body plan, and a true coelom. Deuterostomes (as exemplified by the echinoderms and chordates) develop the anus first, then the mouth at the other end of the embryo. Deuterostomes are coelomate animals these embryological characteristics: 1  Radial cleavage in embryonic cell division: the daughter cells sit on top of previous cells. On the basis of embryonic development, metazoans are divided into Protostomia and Deuterostomia. Protostomes are primitive invertebrates while deuterostomes include echinoderms and chordates. Vertebrates are a large group of animals that include fish,  amphibians, reptiles, birds and mammals like us.   All vertebrates have hearts because they have a close circ … ulatory  system which requires the heart to pump the blood around the body.  The number of chambers in regular heart vary from two to four. However, unlike echinoderms, chordates are characterized by a notochord, jointed appendages, and segmentation. Four features characterize the chordates and have played an important role in the evolution of the phylum: 1. A single, hollow nerve cord runs just beneath the dorsal surface of the animal. Vertebrates are a large group of animals that include fish,  amphibians, reptiles, birds and mammals like us.   All vertebrates have hearts because they have a close circ … ulatory  system which requires the heart to pump the blood around the body. In Vertebrates. all vertebrates are chordates because vertebrates are the sub-group of phylum chordates and also it follow one of the important feature of the chordates i.e. presence of noto … chord whereas all chordates are not vertebrates because some chordates are cephalochordates, urochordates. In vertebrates, the dorsal nerve cord differentiates into the brain and spinal cord. 2. A flexible rod, the notochord, forms on the dorsal side of the primitive gut in the early embryo and is present at some developmental stage in all chordates.
No