How are annelids and nematodes structurally different?
How are annelids and nematodes structurally different?
The main difference between Nematoda and Annelida is that Nematoda has a cylindrical body with tapered ends whereas Annelida has a cylindrical body, which is segmented. Therefore, Nematoda is called roundworms while Annelida is called segmented worms.
What is the structure of annelids?
The overall structure of annelids does not vary very much compared to other phyla. All annelids have a worm-shaped, segmented body, but one main difference among them is the number and organization of bristles and appendages. Annelids are bilaterally symmetrical, triploblasts, and protostomes.
What is the structure of Nematoda?
Body Structure The nematode body is cylindrical, elongated and smooth with no limbs protruding, such as is seen in the common garden worm though generally on a smaller scale. The body is contained within a tough elastic cuticle which in many species forms elaborate structures useful for identification.
Are nematodes and annelids related?
The key difference between nematodes and annelids is that nematodes are roundworms which are not segmented while annelids are true segmented worms. The presence and absence of a true coelom is another difference between nematodes and annelids. Nematodes possess a pseudocoelom while annelids possess a true coelom.
What is the difference between nematodes and annelids?
Nematodes have an unsegmented body whereas annelids are metamerically segmented. Nematodes are pseudocoelomate, whereas annelids have a true coelom. Annelids are mostly hermaphrodites and free-living. …
Are nematodes segmented?
With regards to morphology, nematodes are mostly non-segmented with a cylindrical cross-section with most of them being microscopic (less than one millimeter in length). While a good number of nematodes are free-living organisms, there are many parasitic species.
What are the general characteristics of phylum Annelida?
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.
What are the general characteristics of nematodes?
Characteristics of Nematoda Their body is bilaterally symmetrical and triploblastic. They are cylindrical in shape. They exhibit tissue level organization. Their body has a cavity or pseudocoelom.
How are annelids different from Platyhelminthes and nematodes?
Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex body plan. Segmented worms (phylum Annelida) are the most complex animals with worm-like body plans.
What are nematodes what are its general characteristics?
Nematodes are bilaterally symmetrical, elongate, and usually tapered at both ends. Some species possess a pseudocoel, a fluid-filled body cavity between the digestive tract and the body wall. Like arthropods and members of six other phyla, nematodes secrete an external cuticle that is periodically molted.
What is the difference between Nematoda and Annelida?
Phylum Nematoda and Annelida are two phyla of kingdom Animalia. Nematodes are cylindrical and roundworms with un-segmented bodies. Annelids are segmented worms. They possess a true coelom, unlike nematodes which have a pseudocoelom.
What are the segments of Annelida?
Annelida is an animal phylum with segmented worms. The segments are the repeating sections that collectively form the body of annelids. Each section consists of a separate set of internal organs. Annelids lack an obvious head or antennae.
What is the body cavity of nematodes like?
The body cavity of nematodes is a pseudocoelom, which is lined with mesodermal and endodermal cell layers. The parasitic species have especially developed some nerve bristles to sense the environment around them. What are Annelids? Annelids are a large phylum consisting of segmented worms, ragworms, earthworms, and nuisance leeches.
What is the scientific name for annelids?
The annelids / ˈænəlɪdz / (Annelida / əˈnɛlɪdə /, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.
