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Annelida Research Paper

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Biology

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Research Paper

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Annelida
General characteristics of phylum
Body form
Body wall
Movement
Feeding and digestion
Respiration
Circulation
Blood
Nervous system
Senses

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Excretory system
Reproduction
Classification

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SUBJECT: Content: Annelida ❖ General characteristics of phylum ❖ Body form ❖ Body wall ❖ Movement ❖ Feeding and digestion ❖ Respiration ❖ Circulation ❖ Blood ❖ Nervous system ❖ Senses ❖ Excretory system ❖ Reproduction ❖ Classification ANNELIDA: Annelida came from the Latin word “annelus” means little rings. Annelids are also known as ringworms or segmented worms. They exist in various environments including marine waters, fresh waters and also in moist terrestrial areas. The size of the annelids can range from a few millimetres to an amazing three metres in length. The Australian earthworm measures around 3 metres. Annelids exhibit bilateral symmetry and are invertebrate organisms. They are coelomate and triploblastic. The body is segmented which is the most distinguishing feature of annelids. Examples are earthworm, leeches, lugworms etc. ➢ 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. • The body is covered with a thin cuticle. • They are coelomate. A body cavity or coelom is present. • Annelids live in moist environments, moist soil, freshwater and marine water. • They have parapodia and chitinous setae, used for locomotion. • Their body appears red due to the presence of haemoglobin. • Excretory and nervous systems a ...
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