The larval stage of mosquito is aquatic. They are legless and spend a majority of the time at the waters surface. Commonly known as the wriggler or wriggler stage due to the lashing movements of the abdomen that move them forward, backwards and sideways. Of the 4 stages of development the larval stage is where they are prey for fish and aquatic insects. The larvae have a soft body and a hard head and breathing tube or siphon at the tip of the abdomen. They are classified as insects but I haven't found if they contain or are chitin containing at the larval stage.