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Non-chordates II

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Non-chordates II - Lesson Summary

Phylum Annelida.

The members of this phylum may be aquatic or terrestrial, free-living or sometimes parasitic. Annelids are triploblastic, bilaterally symmetrical, coelomate animals with organ-system level of body organisation. Pheretima and Hirudinaria are some common annelids.

Phylum Arthropoda:

It is the largest phylum of Animalia. Arthropods are bilaterally symmetrical, triploblastic, segmented, coelomate animals with organ-system level of organisation.  Their body is divided into the head, the thorax and the abdomen. These animals are characterised by the presence of jointed appendages and a chitinous exoskeleton. Some common arthropods are Apis, Bombyx, Locusta and Heterometrus.
Phylum Mollusca:

It is the second largest phylum of Animalia. Molluscs are terrestrial or aquatic animals. They are bilaterally symmetrical, triploblastic, coelomate animals with organ-system level of organisation.
The body has a distinct head, a muscular foot and a visceral hump, and is covered by a calcareous shell. Pila, Pinctada, Sepia, Loligo and Octopus are some common molluscs.
Phylum Echinodermata:

It is the last phylum under non-chordates is Echinodermata. Echinoderms have an endoskeleton made up of calcareous ossicles. They are marine, triploblastic, coelomate animals with organ-system level of organisation.  Adult echinoderms are radially symmetrical, but the larvae are bilaterally symmetrical.


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