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Kingdom Animalia - Phylum - Arthropoda - (Organisms with Jointed Legs) | 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 - Arthropoda - (Organisms with Jointed Legs)

Arthropod is an ancient and largest phylum with more than 9,00,000 species.

Phylum - Arthropoda - (Organisms with Jointed Legs)

Arthropod is an ancient and largest phylum with more than 9,00,000 species. The word Arthropod means ‘jointed legs’. Insects, spiders, crabs, shrimps, butterflies, millipedes, centipedes and scorpions belongs to this phylum. The body plan is distinct with segmentation − head, thorax and abdomen . The exoskeleton is made up of chitin. As the size of exoskeleton cannot change during growth the animals has to shed it periodically by a process called moulting.

The coelomic cavity is filled with haemolymph(blood). The haemolymph circulates through the body cavity. They do not have well defined blood vessels. This is called open circulatory system wherein the tissues and cells of the animal body are bathed directly in blood.

Small arthropods directly absorb oxygen through their body surface. Many of the larger aquatic species breathe through feathery book gills and many land arthropods breathe through a system of tiny body tubes called tracheae. Excretion occurs through malphigian tubules and green glands.




 

Tags : Kingdom Animalia , 9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia
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9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia : Phylum - Arthropoda - (Organisms with Jointed Legs) | Kingdom Animalia


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