Question

Difference between nematods and annelid

Answer 1

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.

Both nematodes and annelids are invertebrates with elongated bodies, and they prominently feature among worms.

The majority of nematodes are parasitic while the majority of annelids is not parasitic. Moreover, nematodes do not possess parapodia and have only longitudinal muscles. They also do not have setae or little hairs. Annelids possess parapodia and have both longitudinal and circular muscles. They also have setae or little hairs on each segment.

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Answer 2

Answer:

Nematoda, are also known as Round worms. There are about one million nematode species according to some of the estimations, and already there are 28,000 have been described. The majority of the Nematodes (16,000 species) are parasitic, and that is the reason for the notoriety about the round worms. The largest member of the phylum is about five centimetres long, but the average length is about 2.5 millimetres. The smallest species cannot be observed unless there is the aid of a microscope. 

Annelids are a large phylum consisting segmented worms, rag worms, earthworms, and nuisance leeches. There are over 17,000 extant species of Annelids presently. Usually, they live in freshwater or saltwater as well as around moist terrestrial environments. The body of an Annelid is elongated with segmentation has taken place externally through ring-like constrictions. These constrictions are called as annuli, and they are internally segmented or partitioned via septa at the same places as the annuli. Their segmentation could be regarded as the first sign of differentiation of body parts into different functions. 

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