They are burrowing creatures and play an important role in improving the soil texture and enriching the soil. Q: How are earthworms helpful to farmers?Īns: To a farmer, earthworms are the most helpful and friendly creatures. Learn more about Phylum Echinodermata here. Learn more about Phylum Aschelminthes here. Fertilization can be internal or external.Sexes may be separate or united, wherein they are called hermaphrodites.These invertebrates have a true closed circulatory system.Respiration happens through the general body surface.
They have parapodia and chitinous setae, used for locomotion.Annelids live in moist environments, moist soil, freshwater and marine water.The body is covered with a thin cuticle.Also, they exhibit organ system grade of organisation, showing organ differentiation.
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Download Animal Kingdom Cheat Sheet Below The body is segmented which is the most distinguishing feature of annelids. Furthermore some species from this phylum exhibit some unique shapes and brilliant colours.Īnnelids exhibit bilateral symmetry and are invertebrate organisms. The Australian earthworm measures around 3 metres. The size of the annelids can range from a few millimetres to an amazing three metres in length. They exist in various environments including marine waters, fresh waters and also in moist terrestrial areas. Annelids are also known as ringworms or segmented worms. Having over 17,000 species, Phylum Annelida is a large phylum.