Are Mollusks Protostomes or Deuterostomes?


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Protostomes (which is also referred to as mollusks, annelids, and arthropods) observed to be developing in the embryo, it is basically the mouth of the embryo (referred to as protostome or first mouth). Deuterostomes help in the development of the anus of the embryo, then it renders in the formation of the mouth of the embryo. Deuterostomes are also known as echinoderms and chordates. 

Related Questions To: Are Mollusks Protostomes or Deuterostomes

Do mollusks come under the category of Protostomes or Deuterostomes?

Mollusks, annelids, and arthropods are coming under protostomes while Echinoderms and chordates are deuterostomes.

Mollusks have what kind of body cavity?

The mantle of mollusks comprises the mantle cavity. It also comprises gills after its development. It also houses excretory pores, anus, and gonophores. The systemic heart region is restricted to the coelom of mollusks. Hemocoel encloses the main body cavity. In order to scrap food, many mollusks develop a kind of radula adjacent to their mouth and it helps them in the selection of appropriate food. 

Does Nematoda come under the category of Protostome or Deuterostome?

The inception of the two clades dates back to about 600 million years. After a progression over the years, protostomes have diversified into millions of species. These species are still roaming around and alive today. Around 60000 species of deuterostomes are observed. Furthermore, protostomes are divided into Ecdysozoa. Some of the examples are anthropoids and nematodes. Under spiraling some examples are mollusks, annelids, platyhelminthes, and rotifers.

Are nematodes coming under the category of Protostome?

There are some incredible varieties of animals that come under Protostome. Some of the commonly found biological organisms under protostomes are flatworms (such as tapeworms), nematodes (such as heartworms), mollusks (such as snails and slugs), annelids (such as earthworms), and arthropods (spiders, insects, lobsters, ticks, barnacles, and many more other species).

What is the primary function of the mantle? 

In mollusks, there are several functions performed by the mantle. Its most important function is to protect the internal organs enclosed inside it. The mantle cavity gets the space from the mantle which further helps in the holding of water and it also works as a mode of respiration.

Do jellyfish come under a variety of deuterostomes or protostomes?

Origin and evolution play an important role in the variation of species. Jellyfish are a less complex animal and there are far more complex animals found on earth. Jellyfish and other cnidarians are further divided into two groups and these groups are deuterostome and protostome. Under deuterostomes, chordates, and all the vertebrates come. It is believed that the 555-million-year-old Kimberella was once a member of protostomes.   

Do mollusks consist of a segmented body?

There are more than 11000 diverse and described species of mollusks found on earth. It is the second most diversified phylum after Arthropoda. It is observed that at the primitive stage mollusks were segmented; on the other hand most of the monoplacophorans don’t have segmentation in their body. They have twisted body structure, e.g. torsion. 

Are bodies of mollusks segmented?

Mollusks are considered to be primarily related to organisms in the phylum Annelida, these are also known as segmented worms. But mollusks have a slight differentiation in their body structure as compared to segmented worms. Mollusks don’t have a segmented body. The basic body structure of mollusks is pretty much different.  

What is the process of reproduction in mollusks?

Mollusk reproduces by sexual reproduction process, some of the hermaphrodite animals are slugs and snails, these animals have both males as well as female reproductive organs. In order to reproduce, they need to mate in order to fertilize eggs. Almost all of the mollusks lay eggs that later on turn into a small, free-swimming larvae-like creature which is called veliger. 

How the mouth is formed in the deuterostome? 

The anus of the organism forms as the end product of the cavity in deuterostomes. Blastospores eventually become the anus of the organism. While the formation of the mouth happens on the opposite side. This is the prior differentiation between deuterostomes and protostomes. In protostomes, the primary cavity and secondly anus originate from the mouth. 

Why are molluscs believed to be an advanced group of species as compared to annelids?

The factor that leads to the advancement of mollusks over annelids is the distinct heads of mollusks, superior sense organs. They also have developed gills or lungs for respiration. These are the two prior distinctions of mollusks which put this group of species ahead of annelids.

What varieties of animals come under the class of Polyplacophora?

Chitons are considered to be related to mollusks and also to slugs and snails (referred to as gastropods), mussels and oysters (bivalves), and squids and octopuses (cephalopods). Under the phylum Mollusca, chitons come under the category which is primarily referred to as Polyplacophora. 

Is coelom present in earthworms? 

It has been found that annelids hold two sets of muscles and they use these muscles to contract and relax their body. Annelid worms have a kind of hydrostatic skeleton which is present in the form of a coelom to perform certain actions. The coelom is found in earthworms on their body in the sheath and it surrounds all over their body. It covers their longitudinal and circular muscles.   

Are rotifers triploblastic? 

Rotifers are kinds of organisms. Their name has a distinct meaning and it means “wheel bearing”. They have a feeding structure that seems like a corona over their body. Rotifers are triploblastic. They have bilaterally symmetrical and unsegmented body structures. The body structure of rotifers is divided into three parts, these are head, trunk, and foot. 

Are annelids diploblastic? 

The Annelids have been observed as bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. In order to move and locomote they have parapodia. Annelids are usually belonging to the family of Lophotrochozoa. Lophotrochozoa is a super-phylum or protostome. This phylum also includes mollusks, brachiopods, and nemerteans. 

Are annelids Pseudocoelomates?

The body cavity of the Pseudocoelomates originates partly from endoderm tissue as well as mesoderm tissue. Roundworms come under Pseudocoelomates and these are not annelids. Coelom can be found in annelids. 

Are all Bilateria Triploblastic?

All the animals under Bilateria possess bilateral symmetry. That means to say, they possess both fronts as well as back end. These species also have upsides and downsides. Under all the circumstances, embryos of Bilateria signify three different germ layers. These layers are called endoderm, mesoderm, and ectoderm. That is the reason why Bilateria are called triploblastic.  

Are flatworms Triploblastic?

All the primitive and simplest animals are bilaterally symmetrical well as they all are triploblastic. That means they possess three basic layers of the cell. The animal which has this structure is Platyhelminthes, which is also known as flatworms. While free-living flatworms are planarians. They have a very simple and fundamental history of life. Planarians are primarily found in freshwater. These are carnivorous animals but lack teeth. They are also considered to be scavengers.