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Not to be confused with Etymology, the study of the history of words.
Entomology, from the Greek: entomo-/εντομο- "that which is cut in pieces or engraved/segmented", hence "insect"; and logos/λόγος, "knowledge",Liddell, Henry George and Robert Scott (1980). A Greek-English Lexicon (Abridged Edition). United Kingdom: Oxford University Press. ISBN 0-19-910207-4. is the scientific study of insects. At some 1.3 million described species, insects account for more than 2/3rds of all known organisms,Chapman, A. D. (2006). Numbers of living species in Australia and the World, 60pp. ISBN 978-0-642-56850-2. dating back some 400 million years, and have many kinds of interactions with humans and other forms of life on earth, so it is an important specialty within biology. Though technically incorrect, the definition is sometimes widened to include the study of terrestrial animals in other arthropod groups or other phyla, such as arachnids, myriapods, earthworms, and slugs.
Like several of the other fields that are categorized within zoology, entomology is a taxon-based category; any form of scientific study in which the organisms studied happen to be insects is, by definition, entomology. Entomology therefore includes a cross-section of topics as diverse as molecular genetics, behavior, biomechanics, biochemistry, systematics, physiology, developmental biology, ecology, morphology, paleontology, anthropology, robotics, agriculture, nutrition, and more.
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Entomology is rooted in nearly all human cultures from prehistoric times, primarily in the context of agriculture (esp. biological control and beekeeping), but scientific study began only as recently as the 16th century Antonio Saltini, Storia delle scienze agrarie, 4 vols, Bologna 1984-89, ISBN 88-206-2412-5, ISBN 88-206-2413-3, ISBN 88-206-2414-1, ISBN 88-206-2414-X . The list of entomologists through recorded history is enormous, and includes such notable figures as Charles Darwin, Vladimir Nabokov, Karl von Frisch (winner of the 1973 Nobel Prize in Physiology or Medicine), and two-time Pulitzer Prize winner, E. O. Wilson. Entomology has even entered popular modern culture; Gil Grissom on the CSI: Crime Scene Investigation TV show is an entomologist, who is played by actor William Petersen.
Insects other than Lepidoptera are typically identifiable only through the use of Identification keys and Monographs. Because the class Insecta contains a very large number of species and the characters separating them are unfamiliar, and often subtle (or invisible without a microscope), this is often very difficult even for a specialist.
Insect identification is an increasingly common hobby, with butterflies and dragonflies being the most popular.
Part of a large beetle collection
Many entomologists specialize in a single order or even a family of insects, and a number of these subspecialties are given their own informal names, typically (but not always) derived from the scientific name of the group:
Like other scientific specialties, entomologists have a number of local, national, and international organizations. There are also many organizations specializing in specific subareas.
Many museums contain very large and important insect collections. Here is a list of some of the most important.
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