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Phylum 4 – Nematoda

·         Bilaterally symmetrical body

·         Triploblastic

·         Body shape – cylindrical

·         Lack of organs. Presence of tissues

·         Presence of pseudo-body cavity (not real, sort of a body cavity)

·         Examples of organisms belonging to this phylum – roundworms, tapeworms, ascaris

 

Phylum 5 – Annelida

·         Bilaterally symmetrical

·         Triploblastic

·         True body cavity

·         Well-differentiated organs packed inside the body cavity

·         Differentiation of organs is seen in segments of the body

·         Habitat of organisms – fresh water, sea and land

·         Examples of organs belonging to this phylum – earthworms and leeches

 

Phylum 6 – Anthropoda

·         Anthro – jointed; pod – legs

·         Largest group of animals

·         Bilaterally symmetrical and segmented

·         Body cavity is filled with blood as blood does not flow through blood vessels. Lack of well defined blood vessels is known as open circulatory system

·         Examples of organisms belonging to this phylum – butterflies, cockroaches, spiders, crabs, scorpions and houseflies

Phylum 7 – Mollusca:

·         Bilateral symmetry

·         Reduced coelom cavity

·         Segmentation is seen

·         Presence of kidney-like organs for the purpose of excretion

·         Presence of foot for locomotive activity

·         Examples of organisms belonging to this phylum – snails and mussels

 

 

Phylum 8 – Echinodermata

·         Echinos – hedgehog; derma – skin (in Greek). Spiny, skinned animals

·         Triploblastic

·         Presence of coelom body cavity

·         Locomotive activity by using a special tube system driven by water

·         Presence of hard calcium carbonate (CaCO3) structures which form bones and skeleton system

·         Found in marine habitat

·         Examples of organisms belonging to this phylum – star fish and sea urchins

 

 

Phylum 9 – Protochordata

·         Bilaterally symmetrical

·         Triploblastic

·         Presence of coelom body cavity

·         Presence of advanced body design, called notochord during some stages of growth. A notochord is a rod-like structure running on the ventral side of the body, supporting the back of an animal and separates the nervous tissue from the gut

·         Marine habitat

·         Examples of organisms belonging to this phylum – amphioxus, herdemania, balanoglossus

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