CLASSIFICATION OF DRAGONFLY
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- ARTHROPODA (Jointed appendages.)
CLASS :- INSECTA (3 pairs of legs.)
ORDER :- ODONATA (Incomplete metamorphosis.)
FAMILY :- AESHNIDAE
GENUS :- Anax (Dragon fly)
It has cosmopolitan distribution especially found in India, Myanmar, Srilanka, Malaysia, Asia, Europe and U.S.A.
HABIT AND HABITAT
Dragon flies are abundantly found during rainy season resting on twigs, leaves or grass stalks
GENERAL CHARACTERSTICS OF DRAGONFLY
- Dragon fly is an elegant insect, famous for its beauty and brilliancy of its pigmentary and structural colours.
- Body is divided into head, thorax and abdomen.
- Head is exceptionally mobile and is attached to an exceedingly slender neck.
- Head possesses large compound eyes, filiform antennae and biting and masticatory mouth parts.
- Thorax indistinctly divided into reduced prothorax and fused mesothorax and metathorax. Thoracic legs 3 pairs, namely foreleg, mid leg and hind leg.
- Wings are large, membranous and almost of equal size, frequently narrowing at the base and with venation only slightly reduced. A pterostigma is present and also enlargement of the veins known as ‘arculus’ and the ‘nodus’. When at rest the wings may be held either vertically (damsel flies) or horizontally (dragon flies) wings have intercalated veins.
- Abdomen contains 10 elongated segments with vestiges of 11th and 12th segments. 12th segment contains a pair of caudal furca or copulatory organs.
- Oviposition endophytic or exophytic.
- Metamorphosis is incomplete.
- Nymphs are aquatic and respire by means of rectal or caudal gills. Labium in the nymphs is modified to form a prehensile grasping organ, the mask.
The adult members especially the larger ones are great favourites, with the out-of-door enthusiasts. Each dragon fly has a regular beat up and down in search of flying insect. When insect is sighted the dragon fly wheels from its course to capture the prey. When the insect is captured the dragon fly wheels back to its regular beat.
The insect contains whitish membranous wings and all above features, hence it is Dragon fly.