It is the middle stage of mosquito growing from eggs to pupae, which is formed by mosquito eggs hatching in water. Its body is slender, and its chest is wider than its head or abdomen. When swimming, its body bends and stretches, commonly known as cephalopods.

The ragged body is slender and dark brown, swimming vertically in the water, feeding on bacteria and unicellular algae in the water and breathing air.

It's easy to tell by the tail.