Are protostomia primitive as compared with deutrostomia?

1. What is the difference between Protostomia and Deuterostomia?
2. Did Protostome or Deuterostome come first?
3. In which way are protostomes and deuterostomes the same?
4. Which of the following phylum belongs to Protostomia?
5. What phylum is Deuterostomia?
6. What are the three defining features of deuterostomes?
7. What is meant by Protostomia?
8. What is the characteristics of deuterostomes?
9. What forms the mouth in a Deuterostome?
10. In which way are Protostomes and deuterostomes the same quizlet?
11. What are the differences in the position of where the mesoderm arises within the embryos of Protostomes versus deuterostomes?
12. How does the position of the nerve cord and digestive tract differ between Protostomes and deuterostomes?

What is the difference between Protostomia and Deuterostomia?

Protostomes are primitive invertebrates while deuterostomes include chordates and echinoderms. ... The main difference between protostomes and deuterostomes is that the blastopore in protostomes are developed into a mouth while the blastopore in deuterostomes is developed into an anal opening.

Did Protostome or Deuterostome come first?

The majority of coelomate invertebrates develop as protostomes ("first mouth") in which the oral end of the animal develops from the first developmental opening, the blastopore. In the deuterostomes ("second mouth": cf.

In which way are protostomes and deuterostomes the same?

In which way are protostomes and deuterostomes the same? They both have spiral cleavage of the embryo. The coelom develops in the same way in both. ... They both form a hollow sphere in the embryo that has an indentation called a blastopore.

Which of the following phylum belongs to Protostomia?

Protostomes are divided into the Ecdysozoa (e.g. arthropods, nematodes) and the Spiralia (e.g. molluscs, annelids, platyhelminths, and rotifers).

What phylum is Deuterostomia?

Deuterostomia, (Greek: “second mouth”), group of animals—including those of the phyla Echinodermata (e.g., starfish, sea urchins), Chordata (e.g., sea squirts, lancelets, and vertebrates), Chaetognatha (e.g., arrowworms), and Brachiopoda (e.g., lamp shells)—classified together on the basis of embryological development ...

What are the three defining features of deuterostomes?

Despite looking quite different, the deuterostomes represent a group of animals that all have true tissues, bilateral symmetry, and develop the anus before the mouth during embryonic cell division.

What is meant by Protostomia?

: animals in which the definitive mouth develops directly from the blastopore (as most worms, bryozoans, brachiopods, mollusks, and arthropods) — compare deuterostomia.

What is the characteristics of deuterostomes?

Complete step by step answer: The two characteristics of deuterostomes are radial cleavage and the blastopore becoming anus. In deuterostomes, the early divisions occur parallel or perpendicular to the polar axis. This pattern of cleavage is called radial cleavage.

What forms the mouth in a Deuterostome?

Formation of mouth and anus

The defining characteristic of the deuterostome is the fact that the blastopore (the opening at the bottom of the forming gastrula) becomes the anus, whereas in protostomes the blastopore becomes the mouth.

In which way are Protostomes and deuterostomes the same quizlet?

In protostomes the mouth opening is the first to be formed later followed by the anus. In deuterostomes the anus forms first followed by the mouth. This all occurs in the gastrulation stage.

What are the differences in the position of where the mesoderm arises within the embryos of Protostomes versus deuterostomes?

In deuterostomes, the mouth forms at a site opposite the blastopore end of the embryo and the mesoderm pinches off to form the coelom during the process of enterocoely. ... In Protostomes (“mouth first”), the mouth develops at the blastopore (Figure 3).

How does the position of the nerve cord and digestive tract differ between Protostomes and deuterostomes?

The body has multiple nerve cords and a centrally located anterior heart. In the protostome line (Upper Right), the cords coalesce toward the mouth side (ventral) and the heart shifts dorsally whereas, in the deuterostome line (Lower Right), the opposite occurs.