Odonata
Odonata Temporal range:
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Aeshna juncea hovering over a pond. | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
(unranked): | Dicondylia |
Subclass: | Pterygota |
Division: | Palaeoptera |
Superorder: | Odonatoptera |
Order: | Odonata |
Suborders | |
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Odonata is an
All odonates have
Etymology and terminology
Johan Christian Fabricius coined the term Odonata in 1793 from the Ancient Greek ὀδών odṓn (Ionic form of ὀδούς odoús) 'tooth'. One hypothesis is that it was because their maxillae are notably toothed.[1]
The word dragonfly usually denotes only
External morphology
Size
The largest living odonate is the giant
The smallest living dragonfly is
Description
These insects characteristically have large rounded heads covered mostly by well-developed,
Flight in the Odonata is direct, with flight muscles attaching directly to the wings; rather than indirect, with flight muscles attaching to the thorax, as is found in the Neoptera. This allows active control of the amplitude, frequency, angle of attack, camber and twist of each of the four wings entirely independently.[7]
In most families, there is a structure on the leading edge near the tip of the wing called the pterostigma. This is a thickened, hemolymph–filled and often colorful area bounded by veins. The functions of the pterostigma are not fully known, but it most probably has an aerodynamic effect and may also have a visual function. More mass at the end of the wing may also reduce the energy needed to move the wings up and down. The right combination of wing stiffness and wing mass could reduce the energy consumption of flying. A pterostigma is also found among other insects, such as bees.[8]
The nymphs have stockier, shorter, bodies than the adults. In addition to lacking wings, their eyes are smaller, their antennae longer, and their heads are less mobile than in the adult. Their mouthparts are modified, with the labium being adapted into a unique prehensile organ called a labial mask for grasping prey.[9] Damselfly nymphs breathe through external gills on the abdomen, while dragonfly nymphs respire through an organ in their rectum.[6]
Evolution
Fossil history
Members of the Odonata first appeared during the
The Odonata is closely related to
Phylogeny
The phylogenetic tree of the orders and suborders of odonates according to Bybee et al 2021:[14]
Odonata | |
Taxonomy
In some treatments,
The
Ecology and life cycle
Odonates are aquatic or semi-aquatic as juveniles. Thus, adults are most often seen near bodies of water and are frequently described as aquatic insects. However, many species range far from water. They are carnivorous (or more specifically insectivorous) throughout their life, mostly feeding on smaller insects.[citation needed]
Male Odonata have complex genitalia, different from those found in other insects. These include grasping cerci at the tip of the abdomen for holding the female, and a secondary set of copulatory organs located between the second and third abdominal segment in which the spermatozoa are stored after being produced by the primary genitals— whose external opening is known as the genital pore, on the ninth abdominal segment. This process is called intra-male sperm translocation (ST).[21][22] Because the male copulatory organ has evolved independently from that in other insects, it has been suggested the stem-group dragonflies had external sperm transfer.[23] To mate, the male claspers grasps the female by the thorax (Zygoptera) or head (Anisoptera) while the female bends her abdomen so that her own genitalia can be grasped by the copulatory organ holding the sperm. This is known as the "wheel" position.[6]
Eggs are laid in water or on vegetation near water or wet places, and hatch to produce pronymphs which live off the nutrients that were in the egg. They then develop into
Odonates can act as
In addition, odonates are very sensitive to changes to average temperature. Many species have moved to higher elevations and latitudes as global temperature rises and habitats dry out. Changes to the life cycle have been recorded with increased development of the instar stages and smaller adult body size as the average temperature increases. As the territory of many species starts to overlap, the rate hybridization of species that normally do not come in contact is increasing.[13] If global climate change continues many members of Odonata will start to disappear. Because odonates are such an old order and have such a complete fossil record they are an ideal species to study insect evolution and adaptation. For example, they are one of the first insects to develop flight and it is likely that this trait only evolved once in insects, looking at how flight works in odonates, the rest of flight can be mapped out.[13]
Gallery
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A pair of Ceriagrion cerinorubellum mating
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Libellula depressa resting
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Nymph
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Anax imperator in flight
See also
Lists of Odonata species of
References
- .
- ^ "odonate". Merriam-Webster.com Dictionary.
- ^ Field guide to lower aquarium animals. Cranbrook Institute of Science. 1939.
- ISBN 978-983-812-103-3.
- ISBN 978-0-00-715169-1.
- ^ ISBN 978-0-19-510033-4.)
{{cite book}}
: CS1 maint: multiple names: authors list (link - ^ Richard J. Bomphrey, Toshiyuki Nakata, Per Henningsson, Huai-Ti Lin (2016) Flight of the dragonflies and damselflies, Phil. Trans. R. Soc. B 371 20150389; DOI: 10.1098/rstb.2015.0389.
- S2CID 23441098.
- ^ The toolkit of a hunter – functional morphology of larval mouthparts in a dragonfly
- ^ The Biology of Dragonflies. Cambridge University Press Archive. 2018. p. 324. GGKEY:0Z7A1R071DD.
No Dragonfly at present existing can compare with the immense Meganeura monyi of the Upper Carboniferous, whose expanse of wing was somewhere about twenty-seven inches.
- ^ doi:10.26879/576.
- ^ Mitchell, F.L.; Lasswell, J. (2005). A dazzle of dragonflies. Texas A&M University Press. p. 47.
- ^ PMID 27766110.
- PMID 33609713.
- ^ E.g. Trueman & Rowe (2008)
- ^ Trueman [2008]
- ^ Lohmann (1996), Rehn (2003)
- ^ Paulson, D.; Schorr, M.; Abbott, J.; Bota-Sierra, C.; Deliry, C.; Dijkstra, K.-D.; Lozano, F. (2023). "World Odonata List". OdonataCentral, University of Alabama. Retrieved 14 Mar 2023.
- ^ Dijkstra, K-D. B., G. Bechly, S. M. Bybee, R. A. Dow, H. J. Dumont, G. Fleck, R. W. Garrison, M. Hämäläinen, V. J. Kalkman, H. Karube, M. L. May, A. G. Orr, D. R. Paulson, A. C. Rehn, G. Theischinger, J. W. H. Trueman, J. van Tol, N. von Ellenrieder, & J. Ware. 2013. The classification and diversity of dragonflies and damselflies (Odonata). Zootaxa 3703(1): 36-45.
- PMID 33609713.
- ^ Studies on the secondary male Genitalia of the type species of some dragonflies (Odonata: Anisoptera: Libellulidae)
- ^ Evolution and diversity of intra-male sperm translocation in Odonata: a unique behaviour in animals [2019]
- ^ The Phylogeny of Hexapoda (Arthropoda) and the Evolution of Megadiversity
- ISSN 1470-160X.
- S2CID 40735036.
External links
- Anatomy of Odonata
- dragonflies and damselflies on the UF / IFAS Featured Creatures Web site
- Dragonflies and Damselflies (Odonata) of the United States – USGSstate-by-state listing with distribution maps, images
- International Journal of Odonatology
- IORI species list, photos, social media links Archived 2007-05-29 at the Wayback Machine
- Journal of the Entomological Research Society
- Odonata Central
- Odonatologica
- World Odonata List
- Worldwide Dragonfly Association