write the salient feature and classification of artrhopoda up to order
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Arthropoda is the largest phylum with about nine lakh species. They may be aquatic, terrestrial or even parasitic. They have jointed appendages and a chitinous exoskeleton.
This phylum includes several large classes and contains the class Insecta which itself represents a major portion of the animal species in the world. They possess the ability to survive in every habitat.
The arthropoda characteristics are mentioned below:
- The body is triploblastic, segmented, and bilaterally symmetrical.
- They exhibit organ system level of organization.
- The body is divided into head, thorax, and abdomen.
- Their body has jointed appendages which help in locomotion.
- The coelomic cavity is filled with blood.
- They have an open circulatory system.
- The head bears a pair of compound eyes.
- The exoskeleton is made of chitin.
- The terrestrial Arthropods excrete through Malpighian tubules while the aquatic ones excrete through green glands or coaxal glands.
- They are unisexual and fertilization is either external or internal.
- They have a well-developed digestive system.
- They respire through the general body surface or trachea.
- They contain sensory organs like hairs, antennae, simple and compound eyes, auditory organs, and statocysts.
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