Saturday 2 February 2019

Dragon fly

DRAGON FLY

The dragon flies (order odonata) are commonly found in the vicinity of water.They have long brightly coloured body,large headed and huge compound eyes that often contain as many as 30,000 lenses.Their gauze-like 2pairs of wings are large,membranous and each with a joint - like noudus or notch near the middle,and a coloured spot or pterostigma near apex of front margin. Antennae are small and mouth parts are chewing.Abdomen is greatly elongated. They are also known as the 'misquito-hawks' as mosquitoes from their main diet. Both the aquatic nymphs and adults are predaceous. Common genera are Agrian, Petalura, etc.


No comments:

Post a Comment

Elephantiasis

Elephantiasis Elephantiasis-causes The filarial nematodes belongs to the order Filaroidea. They are lipless and filiform worms in ...