Explain the classification of phylum arthropoda of non chordates?

The phylum arthropoda is divided into different classes like crustacea, chilopoda, diplopoda, insecta and arachnida. The crustacea are divided into cephalo thorax and abdomen. Dorsally, it is covered by carapace and has couple of antennae and compound eyes. They have the green glands for excretion and there are no nephridia. The green glands are also known as malphigian tubules. They have unisexual and bisexual forms and show sexual dimorphism. They have multiple appendages on the head. They help in swimming, reproduction and respiration. The gills act as a respiratory organ in the aquatic forms and book lungs act as a respiratory organ in the terrestrial forms. They show indirect development. Some of the crustaceans also act as a zooplankton which is a vital component of food chain. The chilopoda have a long body which is divided into head and trunk. The trunk has a couple of legs and some of them form poison claws. They have a couple of antennae with multiple legs. They respire by trachea. They have the green glands for excretion and undergo direct development. The body of diplopoda is divided into head, thorax and abdomen. They have a pair of antennae and legs which occur on all segments except one. They respire by trachea. They have the green glands for excretion and undergo direct development. The body of insecta is divided into head, thorax and abdomen. They are also known as hexapoda. They have a pair of antennae and compound eyes. The thorax has segments with multiple legs and wings. The abdomen has 11 segments. They respire by trachea. They have the green glands for excretion with uric acid as their main excretory product and they undergo direct as well as indirect development. They have unisexual and bisexual forms and show sexual dimorphism. Arachnida have their division of body into cephalothorax and abdomen. They have no antennae. The trachea and book lungs act as a respiratory organ. They show direct development. They have the green glands for excretion and have eyes and appendages on the cephalothorax.