Which are the morphological features that differentiate the beings of the phylum Annelida from nematodes and platyhelminthes?

Which are the morphological features that differentiate the beings of the phylum Annelida from nematodes and platyhelminthes?
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Platyhelminthes are worms with flat bodies (flatworms), nematodes are worms with cylindrical but not segmented bodies (roundworms). Annelids are cylindrical worms with segmented bodies (they are metameric).
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How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Description : How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Last Answer : Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain. Nematodes have an anterior neural ... is more outstanding than in nematodes or in flatworms. Image Diversity: earthworm nervous system

What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Description : What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Last Answer : The metameric feature, i.e., the body segmentation in metameres, approximates annelids to arthropods since these animals are segmented beings too. (Bristles present in oligochaete and polychaete annelids are also covered with chitin, the same substance of the arthropod exoskeleton.)

An animal kept in a jar has the following features. (I) It is bilaterally symmetrical. (II) It has coelomic cavity (Ill) The body is segmented (IV) It has jointed appendages. To which phylum does the animal belong to? (1) Arthropoda (2) Annelida (3) Platyhelminthes (4) Mollusca

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What is the typical morphological feature of nematodes that differentiates them from platyhelminthes?

Description : What is the typical morphological feature of nematodes that differentiates them from platyhelminthes?

Last Answer : Nematodes are also known as roundworms. As the name indicates they are not flat like platyhelminthes. In evolutionary grounds with the nematodes the first complete digestive system appears, with mouth and anus, and the pseudocoelom is also a novelty.

What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

Description : What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

Last Answer : Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).

What is meant when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?

Description : What is meant when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?

Last Answer : The classification of these beings as vascular beings means that they have a circulatory system, with vessels that distribute substances throughout the body. Poriferans, cnidarians and flatworms do ... system. In nematodes there is circulation of gases and nutrients through the pseudocoelom fluid.

Concerning the occurrence of separated sexes how are the beings of the phylum Annelida classified?

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Last Answer : These beings may be dioecious (the majority of polychaetes) or hermaphrodite monoecious (oligochaetes and hirudineans).

How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained?

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How is the respiratory system of beings of the phylum Annelida characterized?

Description : How is the respiratory system of beings of the phylum Annelida characterized?

Last Answer : Respiration in annelids can be cutaneous or branchial. Cutaneous respiration occurs due to the rich vascularity under the epidermis. The gills, present in aquatic annelids, are located in the parapodia (false claws) that have an extensive capillary net. Image Diversity: annelid respiratory system

How does digestion in beings of the phylum Annelida work and which type of digestive system do they have?

Description : How does digestion in beings of the phylum Annelida work and which type of digestive system do they have?

Last Answer : Digestion in beings of the phylum Annelida is extracellular. These animals have a complete digestive system, with mouth and anus. Image Diversity: earthworm digestive system

Mention the unique features of phylum Platyhelminthes.

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Enlist the characteristic features of phylum Annelida.

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What are the morphological similarities and differences between nematodes and annelids?

Description : What are the morphological similarities and differences between nematodes and annelids?

Last Answer : Nematodes, like annelids, have a cylindrical elongated body. Annelids differentiate from nematodes by presenting a segmented body (body divided into metameres) and so they are called segmented worms.

Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

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Compared to platyhelminthes which physiological problem have the cylindrical body of nematodes brought? How was that problem solved?

Description : Compared to platyhelminthes which physiological problem have the cylindrical body of nematodes brought? How was that problem solved?

Last Answer : The cylindrical shape of nematodes made impossible the respiration exclusively by simple diffusion among cells since there are tissues far from the exterior. This problem was solved by the ... respiration is cutaneous; it is considered that these animals still make respiration by diffusion).

Peripatus is a connecting link between (a) mollusca and echinodermata (b) annelida and arthropoda (c) coelenterata and porifera (d) ctenophora and platyhelminthes

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Bilaterally symmetrical and acoelomate animals are exemplified by (a) ctenophora (b) platyhelminthes (c) aschelminthes (d) annelida

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What is the morphological feature of molluscs after which the phylum is named?

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Comment on the reproduction of the members of the phylum Platyhelminthes.

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