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Kingdom Animalia - Phylum - Annelida - (Segmented Worms) | 9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia

Chapter: 9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia

Phylum - Annelida - (Segmented Worms)

Earthworms, leeches and a group of marine worms are included in this phylum.

Phylum - Annelida - (Segmented Worms)

Earthworms, leeches and a group of marine worms are included in this phylum. The name Annelida comes from the Greek word “annulations” which are ring like structures joined together. This is called metamerism which means the property of having repeated homologous organs in each segment functioning in coordination with each other. Further these animals are characterized by the possession of a body cavity called coelom. Some of them have movable bristles called setae involved in locomotion .

The body is covered by a moist outer cuticle, a thick multi-layered structure outside the epidermis providing protection. Nephridia are excretory structures and help to remove metabolic wastes. They have a nervous system with brain (cerebral ganglia). The most common larva is trochophore.




When you dig garden soil, you may come across earthworms which are often called-‘the friend of farmers’. Why are they called so?


Have you heard about leeches? How are they different from earthworms in feeding habits?

 

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9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia : Phylum - Annelida - (Segmented Worms) | Kingdom Animalia


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