Dragonfly Anatomy & Identification Guide
Learn how to recognize a dragonfly by its large compound eyes, four veined wings, six spiny legs and long segmented abdomen—and how these features distinguish it from a damselfly.
A dragonfly is a flying insect with a broad head, very large compound eyes, two pairs of veined wings, six legs and a long abdomen divided into visible segments. Most adult dragonflies have a relatively robust body and hold their wings open when resting. Their tiny antennae are much less noticeable than their eyes.
Physical Description of a Dragonfly
Like other insects, an adult dragonfly has three main body regions: the head, thorax and abdomen. Its appearance, however, is unusually specialized for detecting, chasing and capturing small moving prey.
Head
The broad, mobile head is dominated by two compound eyes. It also carries three small simple eyes, short antennae and biting mouthparts.
Thorax
The muscular middle section supports all four wings and all six legs. It is compact and strong because it contains the main structures used in flight.
Abdomen
The long rear section is divided into ten segments. Its shape, markings and terminal appendages provide important identification clues.
Most dragonflies have a sturdier appearance than damselflies, although body size and proportions vary considerably among families. Hawkers and darners often appear large and powerful, while many skimmers are shorter-bodied and frequently return to the same perch.
The Head and Compound Eyes
The most conspicuous part of a dragonfly’s head is its pair of compound eyes. Each eye contains thousands of visual units called ommatidia. Each ommatidium samples a small part of the visual scene, and the nervous system combines those signals.
This arrangement gives dragonflies a very broad field of view and excellent sensitivity to movement. It does not mean that each eye works like one human-style camera lens, and statements that every dragonfly has one fixed number of “lenses” oversimplify differences among species.
- Two large compound eyes occupy much of the head.
- Thousands of ommatidia contribute to motion detection.
- Three small ocelli help detect changes in light.
- Short antennae sit between and in front of the eyes.
- Strong mandibles are used to process insect prey.
In many dragonfly families, the compound eyes meet or nearly meet on top of the head. Clubtails and petaltails are important exceptions, so separated eyes do not automatically make an insect a damselfly.
Dragonfly vision is designed for detecting movement
Entomological descriptions emphasize that dragonfly eyes contain several thousand facets and provide better visual resolution than the compound eyes of many other insects. Their vision is especially important for finding prey, recognizing potential mates and detecting predators.
It is more accurate to describe their view as near-panoramic than to claim that every dragonfly has a perfect, blind-spot-free 360-degree view.
Dragonfly Wings and Flight Structure
Adult dragonflies have four membranous wings: two forewings and two hindwings. The hindwings are generally broader near the base, producing the unequal-winged appearance reflected in the name Anisoptera.
A network of veins strengthens each wing without making it solid or heavy. Near the leading edge of many dragonfly wings is a small, thickened and often dark area called the pterostigma. Its shape and color can help with species identification.
- The forewings and hindwings can be coordinated in different phases.
- The wings twist and flex rather than behaving as rigid flat panels.
- Many species can hover, glide, accelerate and change direction quickly.
- Most dragonflies rest with their wings extended away from the body.
- Wing patches, bands and tinted bases are important field marks.
Dragonflies do not simply beat all four wings in one unchanging pattern. Depending on the maneuver, the forewings and hindwings may move together, out of phase or with one pair leading the other.
Wing timing changes aerodynamic performance
Computational research on hovering dragonflies has shown that the forewings and hindwings contribute to force at different points in the wingbeat cycle. Additional three-dimensional modeling found that changing the phase relationship between the two wing pairs alters vortex formation and aerodynamic performance.
In practical terms, a dragonfly’s agility comes not merely from having four wings, but from precisely controlling their timing, angle, rotation and interaction with the surrounding airflow.
Flight speed is a separate topic and varies by species, behavior and measurement method. See our evidence-based guide to how fast a dragonfly can fly rather than applying one maximum-speed figure to every dragonfly.
Legs, Thorax and Mouthparts
All adult dragonflies have six legs attached to the thorax. The legs are lined with spines and are positioned so that they can help form a basket-like structure beneath the body when an insect is captured in flight.
Dragonfly legs are particularly useful for:
- grasping vegetation, rocks and other perches;
- climbing during and immediately after emergence;
- catching and holding airborne prey;
- bringing captured prey toward the mouth;
- cleaning parts of the head and eyes.
Can dragonflies walk? Their legs are not adapted for efficient, sustained walking. A dragonfly can adjust its position, grip a surface and make short climbing movements, but it does not walk across the ground in the way a beetle or ant does.
The mouthparts include strong mandibles for biting and breaking apart insect prey. The scientific order name Odonata is associated with toothed or serrated jaws. Dragonflies have no teeth like those of a mammal, but the edges of their jaws are well suited to handling other insects.
The Long Segmented Abdomen
Behind the thorax is the long abdomen, which consists of ten segments. Depending on the species, the abdomen may be cylindrical, club-shaped, flattened, narrow or relatively broad.
The abdomen contains much of the digestive and reproductive system. Appendages at its tip also play a role in reproduction and can be valuable identification features. Their exact form differs between males, females, families and species.
Why are dragonflies so colorful?
Dragonfly bodies may appear blue, green, red, orange, yellow, brown, black, white or metallic. These colors can be produced by pigments, microscopic structures that reflect light, or a waxy surface coating known as pruinescence.
Color is useful for identification, but it should not be used alone. Newly emerged adults are often pale and may become more strongly colored as they mature. Males and females may look different, and older individuals can differ from younger adults of the same species.
Identification rule: combine color with abdomen pattern, thorax markings, eye position, wing markings, leg color, habitat and behavior. A single color such as “blue” or “red” can occur in many unrelated species.
Dragonfly vs. Damselfly: What Is the Difference?
Dragonflies and damselflies both belong to the order Odonata and share the same basic insect body plan. The following features are useful for distinguishing a typical adult dragonfly from a typical adult damselfly.
| Feature | Dragonfly | Damselfly |
|---|---|---|
| Body shape | Usually robust or strongly built | Usually slender and delicate |
| Eyes | Very large and usually meet or nearly meet | Clearly separated on opposite sides of the head |
| Resting wings | Usually held open and away from the abdomen | Usually folded together above or alongside the abdomen |
| Wing shape | Hindwings are generally broader near the base | Forewings and hindwings are more similar in shape |
| Typical flight | Often strong, direct and highly maneuverable | Often lighter or more fluttering |
| Nymph gills | Internal rectal gills; no three external tail plates | Usually three external leaf-like gills at the abdomen tip |
These are general identification rules rather than absolute laws. Spreadwing damselflies, for example, may hold their wings partly open, while clubtail dragonflies have eyes that remain visibly separated.
What Does a Dragonfly Nymph Look Like?
A young dragonfly is called a nymph or larva. It lives mainly underwater and does not look like a miniature winged adult.
Dragonfly nymphs generally have shorter, stockier bodies than adults. Their colors are often brown, green or gray, helping them blend into mud, stones, submerged leaves and aquatic vegetation.
- They do not yet have functional adult wings.
- Older nymphs develop visible wing pads.
- The eyes are smaller in proportion than those of adults.
- The lower lip is modified into an extendable grasping labium.
- Dragonfly nymphs have internal gills in a rectal chamber.
- They can expel water rapidly to propel themselves forward.
When development is complete, the nymph climbs out of the water, attaches itself to vegetation or another surface, and undergoes its final molt. The empty skin left behind is called an exuvia.
For a complete explanation of development, emergence and molting, read our guides to the dragonfly life cycle and what dragonfly babies look like .
How to Identify a Dragonfly
Identification is most reliable when several features are considered together. Begin with overall body structure, then work toward smaller markings and behavioral clues.
Check the body profile
Note whether the insect is robust, slender, club-tailed, flattened or unusually long.
Look at the eyes
Check their color, size and whether they meet, nearly meet or remain separated.
Study the thorax
Look for side stripes, shoulder stripes, spots and contrasting panels behind the head.
Follow the abdomen pattern
Record the color and shape of markings on individual abdominal segments rather than describing only the overall color.
Inspect the wings
Look for clear or tinted membranes, dark patches, colored bases, bands and the shape of the pterostigma.
Notice the legs
Leg color, pale stripes and contrasting sections can separate otherwise similar species.
Record the habitat
Note whether the insect is beside a pond, marsh, stream, river, woodland opening or temporary pool.
Observe its behavior
Perching height, patrol route, flight style and preferred resting position often provide useful supporting evidence.
Photographs are most useful when they show the insect from above and from the side. Whenever possible, capture the thorax pattern, abdomen tip, wing bases, pterostigma, eyes and legs.
Continue with our detailed dragonfly identification guide .
Common Myths and Outdated Descriptions
Several popular claims about dragonfly appearance are repeated too broadly. The following corrections provide a more scientifically careful description.
“Every dragonfly eye has exactly 30,000 lenses.”
Compound eyes contain thousands of ommatidia, but the number varies among species. “Ommatidia” is more precise than treating each unit as a complete human-style eye.
“All dragonfly eyes touch.”
The eyes meet or nearly meet in many families, but clubtails and petaltails are well-known exceptions with separated eyes.
“Dragonflies cannot move on their legs.”
Their legs are poorly suited to sustained walking, but they can grip, climb, reposition themselves and move during emergence.
“Giant modern dragonflies flew with dinosaurs.”
The famous insects with wingspans near 70 centimeters were griffinflies, extinct relatives rather than modern dragonflies. They lived roughly 300 million years ago, before dinosaurs.
“The largest dragonfly has a 19-centimeter wingspan.”
The frequently cited 19-centimeter living odonate, Megaloprepus caerulatus, is a giant damselfly rather than a true dragonfly.
“Anisoptera explains the English word dragonfly.”
Anisoptera describes unequal wing shapes. The exact historical origin of the English common name “dragonfly” remains uncertain.
Frequently Asked Questions
What is a simple description of a dragonfly?
A dragonfly is a flying insect with two large compound eyes, four veined wings, six legs and a long segmented abdomen. Most adult dragonflies have robust bodies and rest with their wings held open.
What are the three main body parts of a dragonfly?
The three main body regions are the head, thorax and abdomen. The head carries the eyes, antennae and mouthparts; the thorax supports the wings and legs; and the abdomen contains much of the digestive and reproductive system.
How many wings does a dragonfly have?
An adult dragonfly has four wings: two forewings and two hindwings. The hindwings are usually broader near the base than the forewings.
How many legs does a dragonfly have?
A dragonfly has six legs, as do all insects. The legs are mainly adapted for gripping surfaces and catching prey rather than for efficient walking.
Do all dragonflies have transparent wings?
No. Many species have mostly clear wings, but others have colored bases, dark bands, large patches or an overall amber tint. Nearly all have visible veins and a pterostigma near the leading edge.
Do dragonflies have antennae?
Yes. Dragonflies have a pair of very short antennae. They are difficult to notice because the compound eyes occupy so much of the head.
Do dragonflies have teeth?
They do not have teeth like a mammal. They have strong, serrated biting mouthparts, including mandibles, that are used to grasp and break apart insect prey.
Can a dragonfly sting a person?
No. Dragonflies do not have stingers and do not attack people. A large individual may attempt to bite if it is tightly held, but it normally cannot break human skin.
What does a baby dragonfly look like?
A dragonfly nymph is usually short, stocky and brown, green or gray. It lives underwater, lacks functional adult wings and has a specialized extendable lower lip for catching prey.
What is the easiest way to tell a dragonfly from a damselfly?
Look at the resting wings and eyes. Most dragonflies hold their wings open and have eyes that meet or nearly meet. Most damselflies fold their wings over the abdomen and have clearly separated eyes. Exceptions exist, so body shape and wing structure should also be checked.
Research and Fact-Checking Sources
This page was rewritten to separate dragonfly anatomy and identification from unrelated topics such as diet, speed, mating, migration and cultural symbolism. Scientific terminology and potentially conflicting claims were checked against the following institutional and research sources.
- British Dragonfly Society. “Frequently Asked Questions.” Used for dragonfly–damselfly differences, eye structure, antennae, adult coloration, biting and stinging. View source
- University of California Museum of Paleontology. “Introduction to the Odonata.” Used for the principal anatomical characteristics of dragonflies, damselflies and aquatic nymphs. View source
- Sun, M. and Lan, S. L. 2004. “A computational study of the aerodynamic forces and power requirements of dragonfly Aeschna juncea hovering.” Journal of Experimental Biology, 207, 1887–1901. View research paper
- Kweon, J. and Choi, H. “Vortices around Dragonfly Wings.” Used for the effect of forewing–hindwing phase relationships on vortex structure and aerodynamic performance. View study
- Natural History Museum, London. “Griffinflies: The Earliest Flying Insects.” Used to distinguish prehistoric griffinflies from modern dragonflies. View source
