Crane fly (Tipula sp.) lava. Coloured scanning electron micrograph (SEM) of the head of a larva from a crane fly, showing its mouthparts (centre-right). Crane flies, also known as 'daddy-long-legs', are primitive insects with a single pair of wings. They have long slender, fragile legs that are easily discarded if they become trapped. Magnification: x30, when printed 10 cm wide.