Diane (@00206) • Hey
A dragonfly is a flying insect belonging to the infraorder Anisoptera below the order Odonata.
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- This labium is folded under the body at rest and struck out at great speed by hydraulic pressure created by the abdominal muscles.
- The lower jaw has a huge, extensible labium, armed with hooks and spines, which is used for catching prey.
- The general body plan is similar to that of an adult, but the nymph lacks wings and reproductive organs.
- The first instar is known as a prolarva, a relatively inactive stage from which it quickly moults into the more active nymphal form.
- Dragonfly nymphs vary in form with species, and are loosely classed into claspers, sprawlers, hiders, and burrowers.
- Dragonflies having simple flaps shed the eggs in water, mostly in flight. Dragonflies having ovipositors use them to puncture soft tissues of plants and place the eggs singly in each puncture they make.
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- In females, the genital opening is on the underside of the eighth segment, and is covered by a simple flap (vulvar lamina) or an ovipositor, depending on species and the method of egg-laying.
- The male holds the female behind the head using a pair of claspers on the terminal segment.
- Sperm is produced at the 9th segment, and is transferred to the secondary genitalia prior to mating.
- There are remarkable variations in the presence and the form of the penis and the related structures, the flagellum, cornua, and genital lobes.
- The second and third segments are enlarged, and in males, on the underside of the second segment has a cleft, forming the secondary genitalia consisting of the lamina, hamule, genital lobe, and penis.
- Three terminal appendages are on segment 10; a pair of superiors (claspers) and an inferior.
- The abdomen is long and slender and consists of 10 segments.
- The long leg joints bear rows of spines, and in males, one row of spines on each front leg is modified to form an "eyebrush", for cleaning the surface of the compound eye.
- Each has two short basal joints, two long joints, and a three-jointed foot, armed with a pair of claws.
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- but are used to catch and hold prey, for perching, and for climbing on plants.
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- The legs are rarely used for walking,
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- In most large species of dragonflies, the wings of females are shorter and broader than those of males.
- The leading edge of each wing has a node where other veins join the marginal vein, and the wing is able to flex at this point.
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- but which also serves a hydraulic function to expand the body between nymphal stages (instars) and to expand and stiffen the wings after the adult emerges from the final nymphal stage.
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- The veins carry haemolymph, which is analogous to blood in vertebrates, and carries out many similar functions,
- The hindwings are broader than the forewings and the venation is different at the base.
- The wings are long, veined, and membranous, narrower at the tip and wider at the base.
- The thorax bears two pairs of wings and three pairs of legs.
- The mesothorax and metathorax are fused into a rigid, box-like structure with internal bracing, and provide a robust attachment for the powerful wing muscles inside.
- The prothorax is small and flattened dorsally into a shield-like disc, which has two transverse ridges.
- The thorax consists of three segments as in all insects.
- This arrester system is unique to the Odonata, and is activated when feeding and during tandem flight.
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- The head has a system for locking it in place that consists of muscles and small hairs on the back of the head that grip structures on the front of the first thoracic segment.
- the flap-like labrum, at the front of the mouth, can be shot rapidly forward to catch prey.
- Also, they have three simple eyes or ocelli. The mouthparts are adapted for biting with a toothed jaw;
- as also in the genus Epiophlebia.
- The compound eyes meet at the top of the head (except in the Petaluridae and Gomphidae,
- These facets provide complete vision in the frontal hemisphere of the dragonfly.
- Petalura gigantea has 23890 ommatidia of just one size.
- The facets facing downward tend to be smaller.
- *Aeshna interrupta* has 22650 ommatidia of two varying sizes, 4500 being large.
- the numbers being greater in the larger species.
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