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Dragonflies and Damselflies (Insecta: Odonata)

Seth Bybee

The Featured Creatures collection provides in-depth profiles of insects, nematodes, arachnids and other organisms relevant to Florida. These profiles are intended for the use of interested laypersons with some knowledge of biology as well as academic audiences.

Introduction

The order Odonata contains the dragonflies and damselflies and is one of the most popular insect groups. Odonates are popular with both the amateur and professional because they are large, colorful, easily observable and have exceptionally charismatic behaviors. In recent years dragonflies in particular have been popular with birders as many dragonflies rival birds in wingspan, color, gregariousness, and predictability. As a result of their popularity with the public, they have become the focus of many conservation efforts in North America, Europe, and Asia.

Odonata was until recently composed of three suborders: Anisoptera, commonly known as dragonflies; Zygoptera, commonly known as damselflies; and Anisozyoptera, as the name denotes, a morphological composite of the previous two suborders. However, the suborder Anisozygoptera has been abandoned, as current research shows that Anisozygoptera is not a natural group, and is paraphyletic (Rhen 2003; Lohman 1996). Thus, the group has been combined with the suborder Anisoptera, which does form a natural group in a new suborder called Epiprocta (Bechly 1996). To facilitate the discussion of North American odonates it is useful to use the names Zygoptera and Anisoptera when discussing differences between the damselflies and dragonflies, as there are no extant Anisozygoptera in North America.

Dragonflies (Anisoptera) make up the more specious of the two suborders and are much more easily observed than their dainty relatives, the damselflies. They have large eyes that take up nearly the entire head surface and when not contiguous are not as widely separated as within the damselflies (see the key below). They also have a very robust body structure to support a massive musculature that propels their large, broad wings. Dragonflies are unmatched as fliers and have a very agile, deliberate flight. Males are often territorial, defending oviposition sites from other males.

Dorsal view of an adult dragonfly from the family Libellulidae.
Figure 1. Dorsal view of an adult dragonfly from the family Libellulidae.
Credit: Seth Bybee, University of Florida

 

There are six families of dragonflies found in Florida, each of which is easily identifiable. These insects are commonly found around ponds and open bodies of fresh water and large blacktop parking lots (perhaps parking lots resemble open bodies of water to odonates where they search for prey and mates). There are a number of species that disperse away from water for a time before returning with a mate to breed and deposit eggs.

Damselflies (Zygoptera) comprise the more morphologically diverse suborder of odonates. In North America and particularly in Florida they have similar characteristics, which are: eyes separated by more than the width of a single eye, abdomen much longer than wings, very slim body structure and a simple fluttering flight. Damselflies can often be quite spectacular in color such as the ebony jewelwing damselfly, Calopteryx maculata, found throughout the eastern United States and Florida wherever there are slow flowing, shaded wooded streams.

Dorsal view of an adult Calopteryx maculata, a damselfly. The species is in the family Calopterygidae. This image shows one of two general wing forms found within damselflies in Florida.
Figure 2. Dorsal view of an adult Calopteryx maculata, a damselfly. The species is in the family Calopterygidae. This image shows one of two general wing forms found within damselflies in Florida.
Credit: Seth Bybee, University of Florida

 

Dorsal view of an adult damselfly from the family Coenagrionidae. This image shows one of two general wing forms found within damselflies in Florida.
Figure 3. Dorsal view of an adult damselfly from the family Coenagrionidae. This image shows one of two general wing forms found within damselflies in Florida.
Credit: Seth Bybee, University of Florida

 

Away from the forest habitat one can find other families of damselflies. One of the most commonly encountered families is Coenagrionidae, which can be observed just about anywhere along the edges of water systems. A less common family of damselflies is Lestidae. This group is readily identifiable in the field by their behavior of perching with their wings held open, a characteristic more common to dragonflies than damselflies.

Distribution

Odonates are found on every continent except for Antarctica. In particular, the majority of the families that comprise Anisoptera are broadly distributed throughout the world. Some species of dragonfly have vast distributions such as the blue-eyed darner, Rhinoaeschna multicolor, which is found from coast to coast in North America, in addition to Central and South America. In contrast, many families of damselflies are narrowly restricted and several families have an extremely limited distribution.

Florida is home to more than a 150 species of odonates belonging to three families of damselflies: Calopterygidae, Coenagionidae, and Lestidae (Daigle 1991) and six families of dragonflies: Aeshnidae, Cordulegastridae, Corduliidae, Gomphidae, Libellulidae, and Petaluridae (Daigle 1992). They can be seen near any body of water or running stream, often sitting in sunspots breaking through the forest canopy along a river or pond, or patrolling the water's edge. Some species can be found in open fields far away from water while searching for prey or while migrating.

Description

Eggs: Odonate eggs display a large array of shapes, from those that resemble tiny rice grains to minute mangos. Odonates oviposit in three ways: endophytic (within a plant), epiphytic (on the surface of the plant), and exophytic (on water or land) (Corbet 1999). Generally, eggs oviposited endophytically are several times longer than wide while those laid epiphytically and exophytically are ellipsoidal to subspherical (Corbet 1999). Clutch sizes can be as large as 1500, with some females depositing several thousand eggs in a lifetime (Corbet 1999). Eggs hatch seven to eight days after oviposition but hatching can be postponed for up to 80 days (Miller 1992) and in one case 360 days (Sternberg 1990).

Immature odonates (naiads): Immature odonates are sometimes referred to as larvae or nymphs, but here will be referred to as naiads because odonates are aquatic hemimetabolous (lacking a pupal stage) insects as immatures. Naiads live in most aquatic habitats. Some can even survive in salt water (Corbet 1999). All naiads are voracious predators feeding on everything from small invertebrates such as mosquito larvae to smaller vertebrates such as fish and frogs.

Frontal view of an dragonfly naiad from the family Macromiidae. This image shows the general form of dragonfly naiads.
Figure 4. Frontal view of an dragonfly naiad from the family Macromiidae. This image shows the general form of dragonfly naiads.
Credit: Seth Bybee, University of Florida

 

Dorsal view of an damselfly naiad from the family Calopterygidae. This image shows the general form of damselfly naiads.
Figure 5. Dorsal view of an damselfly naiad from the family Calopterygidae. This image shows the general form of damselfly naiads.
Credit: Seth Bybee, University of Florida

 

Naiads will molt nine to 17 times before becoming adults (Corbet 1999). The number of generations per year depends on the species of odonate. Species at higher altitudes or in dry environments usually have one generation per year while those in tropical habitats may undergo multiple generations per year depending on the availability of appropriate habitats.

When naiads are ready for their final molt they leave the water and crawl onto the bank or vegetation where they will molt into adults. Much like a caterpillar emerging from a chrysalis, they need to pump up their wings and allow their bodies to harden before they can be effective fliers. A newly emerged odonate is teneral (soft). A teneral dragonfly has glossy wings and the colors on the body are often pale. Several days after emerging and hardening completely, a dragonfly will have taken on the colors of an adult dragonfly.

Adults: Identifying males and females is not difficult. Males will have what appears to be a pouch on the second and third abdominal segments that contains secondary genitalia. The actual male genitalia are found on the last abdominal segments along with a grasping structure used to hold the female while mating. The male produces sperm at the tip of the abdomen and transfers this sperm to the secondary genitalia where the female will have access to it. Females do not have secondary genitalia or grasping structures at the end of the abdomen but instead have a single genital opening and a small ovipositor at the end of the abdomen that will be used to oviposit her eggs (see above for types of oviposition). Normally, the male dragonfly is more colorful while the female will be a dull brown or grey. This is not true for all odonates. For example, both sexes of Calopteryx maculata are very similar in coloration with the exception of the female having a white pterostigma while the male does not.

When odonates mate they form what is called a "mating wheel." The wheel is formed when the male grasps the female behind the head and the female raises the tip of her abdomen forward to come in contact with the secondary genitalia of the male. Odonates can often be seen flying in tandem in this fashion.

Adult Key to the Odonate Families of Florida

1. Head flat in dorsal view, with eyes separated by more than the width of a single eye (Fig. 6). Wing venation and wing shape is similar in both fore and hind wings (Figs. 7a & 7b). . . . . . 2 (suborder Zygoptera)

1'. Head round in dorsal view, with eyes touching and making up the majority of the head area (Fig.8). If eyes not touching they are NOT separated by more than the width of an eye (Fig. 9). Wing venation and wing shape in fore and hind wings NOT similar (Fig. 10). . . . . . 4 (suborder Anisoptera)

2(1.)Wings broad with heavy venation (Figs. 11a & 11b) and several antenodal crossveins (Fig. 12). Wings may be entirely dark or have a red spot at the base of the wing. Larger damselflies found in the forest or shaded areas along running streams. . . . . . Calopterygidae

2'.Wings with a simpler venation (Figs. 7a & 7b), usually clear and only two antenodal crossveins (Fig. 14). Generally smaller damselflies found close to pools or lakes, in grasses or along the shoreline. . . . . . 3

3(2'). Veins IR2+ and RP3- arising nearer to the arculus than the nodus (Fig. 15). Can be seen resting with wings wide-open hanging from grasses and brush near pools of water. . . . . . Lestidae

3'. Veins IR2+ and RP3- arising nearer to the nodus than the arculus (Fig. 16). Can be seen resting with wings closed together over the abdomen. . . . . . Coenagrionidae

4(1').Eyes touching broadly across top of the head (Fig. 8). . . . . . Aeshnidae

4'. Eyes never as above. . . . . . 5

5(4').Eyes barely touching or touching only at a single point (Figs. 17a & 17b). . . . . . 6

5'.Eyes not touching (Fig. 9). . . . . . 9

6(5).Labium with a median cleft (Fig. 20). Pterostigma without a brace crossvein (Fig. 21). . . . . . Cordulegastridae

6'.Labium not as above (Fig. 22). Pterostigma with brace crossvein (Fig. 23). . . . . . 7

7(6'). Well developed loop forming a boot shape in hind wing (Fig. 24). . . . . . Libellulidae

7'. Loop forming a boot shape but not well developed (Fig. 25) or loop present but lacking a boot shape all together (Fig. 26). . . . . . 8

8(7'). Loop in hind wing forming a boot shape but lacking the cells that make up the "toe" region (Fig. 25). . . . . . Corduliidae

8'. Loop present but lacking a boot shape all together (Fig. 26). . . . . . Macromiidae

9(5'). Subtriangle of forewing not single celled (Fig. 28). Pterostigma long (longer than 1/4 the distance between the nodus and the end of R1 (Fig. 30)). . . . . . Petaluridae

9'.Subtriangle of forewing single celled (Fig. 31). Pterostigma not long (Fig. 32). Last segments of abdomen usually enlarged (Fig. 33). . . . . . Gomphidae

Selected References

Anonymous. (2005). The Dragonfly Society of the Americas. https://www.dragonflysocietyamericas.org (June 2022).

Corbet PS. 1999. Dragonflies: Behavior and ecology of Odonata. Comstock Publishing Associates, Cornell University Press. Ithaca, New York.

Daigle JJ. 1991. Florida damselflies (Zygoptera): A species key to the aquatic larval stages. State of Florida Department of Environmental Regulation. Technical Series. Vol. 11, Num. 1.

Daigle JJ. 1992. Florida dragonflies (Anisoptera): A species key to the aquatic larval stages. State of Florida Department of Environmental Regulation. Technical Series. Vol. 12, Num. 1.

Lohmann H. 1996. Das phylogenetische system der Anisoptera (Odonata). Deutsche Entomologische Zeitschrift 106: 209–266.

Mauffray B. (2005). International Odonata Research Institute. http://www.iodonata.net/ (1 April 2015).

Merritt RW, Cummins KW. 1996. An introduction to the aquatic insects of North America (3ed). Kendall/Hunt Publishing Company. Dubuque, Iowa.

Miller PL. 1992. The effects of oxygen lack on egg hatching in an Indian dragonfly, Potamarcha congener. Physiological Entomology 17: 68–72. https://doi.org/10.1111/j.1365-3032.1992.tb00991.x

Mitchell F, et al. (2012). Digital dragonflies. Texas A&M AgriLife. https://agrilife.org/dragonfly/ (1 April 2015).

Rehn AC. 2003. Phylogenetic analysis of higher-level relationships of Odonata. Systematic Entomology 28: 181–240. https://doi.org/10.1046/j.1365-3113.2003.00210.x

Sternberg K. 1990. Autökologie von sechs Libellenarten der Moore und Hochmoore des Schwarzwaldes und Ursachen ihrer Moorbindung. DrT, Albert-Ludwigs-University, Freiburg Germany.

Westfall MJ, May ML. 1996. Damselflies of North America. Scientific Publishers, Gainesville, Florida. 649 pp.

Images for Adult Key to the Odonate Families of Florida

Head of Calopteryx maculata, a damselfly, with eyes separated by more than the width of a single eye.
Figure 6. Head of Calopteryx maculata, a damselfly, with eyes separated by more than the width of a single eye.
Credit: Seth Bybee, University of Florida

 

Fore and hind wings of adult lestid damselfly.
Figure 7a. Fore and hind wings of adult lestid damselfly.
Credit: Seth Bybee, University of Florida

 

Wing structures of damselflies (after Rehn 2003).
Figure 7b . Wing structures of damselflies (after Rehn 2003). 
Credit: Seth Bybee, University of Florida 

 

Head of adult aeshnid dragonfly. Head round in dorsal view, with eyes touching and making up the majority of the head area.
Figure 8. Head of adult aeshnid dragonfly. Head round in dorsal view, with eyes touching and making up the majority of the head area.
Credit: Seth Bybee, University of Florida

 

Head of adult gomphid dragonfly. Eyes not touching and not separated by more than the width of an eye.
Figure 9. Head of adult gomphid dragonfly. Eyes not touching and not separated by more than the width of an eye.
Credit: Seth Bybee, University of Florida

 

Fore and hind wing of a gomphid dragonfly; wing venation and wing shape in fore and hind wings not similar.
Figure 10. Fore and hind wing of a gomphid dragonfly; wing venation and wing shape in fore and hind wings not similar.
Credit: Seth Bybee, University of Florida

 

Wings of Calopteryx maculata, a damselfly. 
Figure 11a. Wings of Calopteryx maculata, a damselfly. 
Credit: Seth Bybee, University of Florida

 

Wings of Calopteryx maculata, a damselfly. Wings broad with heavy venation.
Figure 11b. Wings of Calopteryx maculata, a damselfly. Wings broad with heavy venation.
Credit: Seth Bybee, University of Florida

 

Wings of of Calopteryx maculata, a damselfly, showing several antenodal crossveins.
Figure 12. Wings of of Calopteryx maculata, a damselfly, showing several antenodal crossveins.
Credit: Seth Bybee, University of Florida

 

Wings of a lestid dragonfly showing only two antenodal crossveins. 
Figure 14. Wings of a lestid dragonfly showing only two antenodal crossveins. 
Credit: Seth Bybee, University of Florida

 

Wing of lestid damselfly showing veins IR2+ and RP3- being closer to the arculus than the nodus (blue box).
Figure 15. Wing of lestid damselfly showing veins IR2+ and RP3- being closer to the arculus than the nodus (blue box).
Credit: Seth Bybee, University of Florida

 

Wing of a Coenagrionid damselfly showing veins IR2+ and RP3- being closer to the nodus than the arculus (blue box).
Figure 16. Wing of a Coenagrionid damselfly showing veins IR2+ and RP3- being closer to the nodus than the arculus (blue box).
Credit: Seth Bybee, University of Florida

 

Eyes barely touching or touching only at a single point. 
Figure 17a. Eyes barely touching or touching only at a single point. 
Credit: Seth Bybee, University of Florida

 

Eyes barely touching or touching only at a single point. 
Figure 17b. Eyes barely touching or touching only at a single point. 
Credit: Seth Bybee, University of Florida

 

Labium of an adult cordulegastrid dragonfly with medium cleft.
Figure 20. Labium of an adult cordulegastrid dragonfly with medium cleft.
Credit: Seth Bybee, University of Florida

 

Vein thin and not a brace crossvein (red box). 
Figure 21. Vein thin and not a brace crossvein (red box). 
Credit: Seth Bybee, University of Florida

 

Labium of an adult cordulegastrid dragonfly without medium cleft. 
Figure 22. Labium of an adult cordulegastrid dragonfly without medium cleft. 
Credit: Seth Bybee, University of Florida

 

Pterostigma with brace crossvein. 
Figure 23. Pterostigma with brace crossvein. 
Credit: Seth Bybee, University of Florida

 

Hind wing of a libellulid dragonfly showing a fully formed boot shape (shaded area).
Figure 24. Hind wing of a libellulid dragonfly showing a fully formed boot shape (shaded area).
Credit: Seth Bybee, University of Florida

 

Hind wing of a corduliid dragonfly showing a boot shape without a "toe" region (shaded area). 
Figure 25. Hind wing of a corduliid dragonfly showing a boot shape without a "toe" region (shaded area). 
Credit: Seth Bybee, University of Florida

 

Hind wing of a corduliid dragonfly lacking a boot shape all together (shaded area).
Figure 26. Hind wing of a corduliid dragonfly lacking a boot shape all together (shaded area).
Credit: Seth Bybee, University of Florida

 

Forewing of a petalurid dragonfly not single celled (shaded area).
Figure 28. Forewing of a petalurid dragonfly not single celled (shaded area).
Credit: Seth Bybee, University of Florida

 

Fore and hind wing of a petalurid dragonly showing the unusual length of the pterostigma (shaded area). 
Figure 30. Fore and hind wing of a petalurid dragonly showing the unusual length of the pterostigma (shaded area). 
Credit: Seth Bybee, University of Florida

 

Forewing of a gomphid dragonfly; subtriangle of forewing single celled (shaded area).
Figure 31. Forewing of a gomphid dragonfly; subtriangle of forewing single celled (shaded area).
Credit: Seth Bybee, University of Florida

 

 

Forewing of a gomphid dragonfly; Pterostigma not long (shaded area). 
Figure 32. Forewing of a gomphid dragonfly; Pterostigma not long (shaded area). 
Credit: Seth Bybee, University of Florida

 

 

Enlarged abdominal segments of a gomphid dragonfly. 
Figure 33 . Enlarged abdominal segments of a gomphid dragonfly.  
Credit: Seth Bybee, University of Florida 

 

Publication #EENY355

Release Date:June 17th, 2021

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About this Publication

This document is EENY355, one of a series of the Entomology and Nematology Department, UF/IFAS Extension. Original publication date August 2005. Revised April 2015. Reviewed March 2021. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication. This document is also available on the Featured Creatures website at https://entnemdept.ufl.edu/creatures/.

About the Authors

Seth Bybee, Entomology and Nematology Department; UF/IFAS Extension, Gainesville, FL 32611.

Contacts

  • Elena Rhodes
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