● `color{Brown}"Members"`:
`star` This is the `color{Violet}"largest phylum"` of Animalia which includes `color{Violet}"insects"`.
`star` Over `color{Violet}"two-thirds"` of all named species on earth are arthropods.

● `color{Brown}"Basic Features"`: They have `color{Violet}"organ-system"` level of organisation. They are `color{Violet}"bilaterally symmetrical"`, `color{Violet}"triploblastic"`, `color{Violet}"segmented"` and `color{Violet}"coelomate"` animals.

● `color{Brown}"Examples"` :

`star` `color{Violet}"Economically important insects"` – 𝘈𝘱𝘪𝘴(Honey bee), 𝘉𝘰𝘮𝘣𝘺𝘹 (Silkworm), 𝘓𝘢𝘤𝘤𝘪𝘧𝘦𝘳 (Lac insect)
`star` `color{Violet}"Vectors"` – 𝘈𝘯𝘰𝘱𝘩𝘦𝘭𝘦𝘴, 𝘊𝘶𝘭𝘦𝘹 𝘢𝘯𝘥 𝘈𝘦𝘥𝘦𝘴 (Mosquitoes)
`star` `color{Violet}"Gregarious pest"` – 𝘓𝘰𝘤𝘶𝘴𝘵𝘢 (Locust)
`star` `color{Violet}"Living fossil"` – 𝘓𝘪𝘮𝘶𝘭𝘶𝘴 (King crab).

● `color{Brown}"Morphology"`:

`star` The body of arthropods is covered by `color{Violet}"chitinous exoskeleton"`.



`star` The body consists of `color{Violet}"head, thorax and abdomen"`.



`star` They have `color{Violet}"jointed appendages"` (arthros-joint, poda-appendages).



● `color{Brown}"Respiratory System"`: Respiratory organs are `color{Violet}"gills"`, `color{Violet}"book gills"`, `color{Violet}"book lungs"` or `color{Violet}"tracheal system"`.



● `color{Brown}"Circulatory system"`: Circulatory system is of `color{Violet}"open"` type.

● `color{Brown}"Sensory organs"`: Sensory organs like `color{Violet}"antennae"`, `color{Violet}"eyes"` (compound and simple), `color{Violet}"statocysts or balance organs"` are present.



● `color{Brown}"Excretory System"`: Excretion takes place through `color{Violet}"malpighian tubules"`.