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The three main phyla under protostomes are Annelida (segmented worms), Mollusca (mollusks), and Arthropoda (arthropods). These organisms share a common characteristic of developing their mouths from the first opening formed during embryonic development.

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Q: What are the three phyla under protostomes?
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Are cnidarians protostomes or deuterostomes?

Although most of the animal phyla are included in the deuterostomes and protostomes, cnidaria, porifera, placozoa and ctenophora are not included in the group of animals know as Bilateria (which contains the deuterostomes and protostomes). Cnidarians and ctenophores are in a group called Radiata, and Porifera and Placozoa are in the group known as Parazoa.


What happens to the coelom as each phyla of protostomes evolve?

As protostome phyla evolve, the coelom may change in structure and function. For example, in some phyla like annelids, the coelom functions as a hydrostatic skeleton. In arthropods, the coelom may be reduced or lost altogether.


Are cnidarians protostomes?

No, cnidarians are not protostomes. They are classified as diploblastic animals, meaning they have two germ layers during development (endoderm and ectoderm), whereas protostomes are triploblastic animals with three germ layers. Cnidarians are more closely related to animals like jellyfish, corals, and sea anemones.


Are flatworms prokaryote or eukaryote?

They are protostomes.


What is a protostome?

A protostome is a type of animal development in which the mouth develops before the anus. Protostomes include a vast array of invertebrate phyla, such as arthropods, mollusks, and annelids. This developmental characteristic distinguishes protostomes from deuterostomes, where the anus forms before the mouth.


Are worms protostomes?

Most invertebrate animals are protostomes.


Are leeches protostomes?

Yes, since they are annelids, they are protostomes.


Which phyla have cephilization?

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What are the three main differences among the three phyla of worms?

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Are bivalves protostomes or deuterostomes?

Bivalves are protostomes. They belong to the phylum Mollusca, which is characterized by protostome development. This means that during their embryonic development, the blastopore becomes the mouth.


Are Mollusks segmented worms and arthropods Protostomes?

Yes, molluscs fit into the group known as protostomes.


How are fungi divided into three phyla?

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