Question

what is mean by the term 'annelida'(class 9)​

Answer 1

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Annelida is a Group . Studied in class 9th at first in chapter Diversity .

Annelids are all bilaterally symmetrical animals. They range in size from much less than 1 mm in length to more than 3 m. Some earthworms, such as the Giant Gippsland Earthworm (Megascolides australis), can reach 1 m in length.
The largest leech in the world, Haementeria ghilianii, is found in South America and reaches more than 40 cm in length.


∆ 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. The coelom (formed via schizocoely) is generally organized as a series of compartments divided by intersegmental septa.

This compartmentalization means that if the worm is damaged the coelomic contents will only be lost from a few segments, and locomotion can be maintained. In other annelids there may only be a few septa dividing the coelom. Under these circumstances much more coelomic fluid is lost with injury, and the worm may be severely affected. A number of groups, particularly leeches and a number of small polychaetes, have little or no coelomic space.

Answer 2

annelida is phylum of Kingdom animalia.

the animals in phylum annelida have cylinder shaped and segmented body.The animals present in it are leech,earthworm,neries. they breath through their skin.Haemocoleon is present.They are triploblastic and billaterally symmetrical.

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