what are the distinguishing characteristics of the phylum annelida?
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Characteristics of Phylum Annelida They have a long and segmented body. Annelids are bilaterally symmetrical. They are triploblastic. Also, they exhibit organ system grade of organisation, showing organ differentiation.
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Anatomy – Leeches Are Segmented and Slugs Have a Foot Leeches belong to the phylum Annelida; they are segmented worms. ... Slugs are gastropod mollusks with two pairs of feelers on their heads. One pair has eyespots, and the other has a sense of smell.
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['They possess an exoskeleton.', 'They have jointed appendages.', 'Their body is segmented.', 'They are bilaterally symmetrical.', 'They possess an open circulatory system.']
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['Fast growth.', 'Rapid reproduction.', 'High dispersal ability.', 'Phenotype plasticity (the ability to alter growth form to suit current conditions)', 'Tolerance of a wide range of environmental conditions (Ecological competence)']
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Segmented worms belong to the phylum Annelida (an nee LID ah). Earthworms and other segmented worms have bodies made of many sections Page 2 called segments.
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The most familiar invertebrates include the Protozoa, Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca and Arthropoda. Arthropoda include insects, crustaceans and arachnids.
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['Hemichordata is bilaterally symmetrical and triploblastic animal.', 'They are exclusively marine animals.', 'They can be solitary or in colonies.', 'Hemichordata have a true body cavity or coelom.']
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Animals in the phylum Chordata share four key features: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
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Explanation: There are four unique characteristics that an organism must have at some point in their life history to be classified as a chordate. These include a notochord or dorsally located support rod, a dorsally located nerve cord that is filled with fluid, pharyngeal pouches and a postanal tail.
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Mollusks are a phylum of invertebrate animals defined by their distinct body structure -- a head, a visceral mass, a mantle and some kind of foot. The mantle protects the mollusk's body in place of a skeletal structure, and the "foot" has taken on many adaptions across the mollusca species.
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Silverfish, scorpion, dragonfly and prawns are the organisms which belong to the phylum Arthropoda. The characteristic of arthropod is the presence of hard exoskeleton. The exoskeleton is made up of chitin. They have a segmented body and jointed appendages.
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Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain.
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Coelom. Nearly all annelids have a fluid-filled cavity between the outer body wall and the gut, and this is referred to as a coelom (Figure 1). The coelom is often used as a storage area for gametes and acts as a hydrostatic skeleton for locomotion.
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['They are multicellular organisms which do not possess chlorophyll.', 'They are eukaryotic organisms.', 'Cell wall is absent.', 'Mode of nutrition is heterotrophic i.e. they depend on other organisms for food.', 'They have muscle cells due to which they have the capability to contract and relax the body parts.']
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Annelids have a well-developed, closed circulatory system (one in which blood is limited to vessels) that is segmentally arranged. They also have a complete, one-way digestive tract with a mouth and anus. The digestive tract is not segmented.
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The two most prominent features that distinguish roundworms from flatworms are the presence of a pseudocoelom, or partially developed body cavity, and a complete digestive tract with two openings, a mouth and an anus.
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Contrast this with nematodes, which have unsegmented bodies. True coelom: The coelom of an annelid is a large space in which the internal organs form. Since the body is segmented, the coelom is segmented, too. This makes annelids different from nematodes, which have a pseudocoelom.