Question

What are characterstic of Nematoda? with examples

Answer 1

Characteristics of Phylum Nematoda

Nematodes are characterized by their long tube-like appearance that lacks a visually distinct head or tail. In other words, they have a head and a tail, it's just really hard to tell which end is which. A second unique feature of this phyla is the cuticle, secreted by a layer of skin cells. The cuticle is the strong but flexible outer layer that serves to support and protect the worm, aid with movement, and help maintain the internal pressure that gives the worm its characteristic round shape.

They have a very simple body plan. Below the skin cells is a layer of muscle cells. The muscle cells are controlled by two nerves that run the length of the roundworm's body. One down the dorsal (back) side, and one down the ventral (belly) side. Roundworms have a complete digestive tract with a mouth at the anterior (head) end and an anus at the posterior (tail) end.

Nematodes are a very fertile bunch, with as many as 90,000 individuals found on a single rotting apple. Knowing this, it should not be much of a surprise that most of the internal space of the roundworm is taken up by organs, either oviducts or testes. They do not possess a circulatory or respiratory system.



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Answer 2

Hey mate !!

Thanks for asking this question

Here is your answer

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Characteristic :

• They may be free living or parasitic and aquatic or terrestrial

• Their body appear circular in cross-section

• They are unsegmented and have bilateral symmetry

• They are triploblastic and have organ system level of organisation.

• Roundworms have a false body cavity or pseudocoelom

• Male and female are distinct from each other, i.e., dioecious. Size of female is usually larger than male

• Fertilization is internal and development may be direct or indirect.

Examples :

• Rhabditis

• Ascaris

• Wuchereria

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