DeLong, Dwight M. College of Biological Sciences, Ohio State University, Columbus, Ohio.
Labandeira, Conrad C Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC.
Last reviewed:January 2020
- Body wall
- Internal Anatomy
- Respiratory system
- Digestive system
- Excretory system
- Circulatory system
- Nervous system
- Reproductive system
- Fossil record
- Related Primary Literature
- Additional Reading
A class of the phylum Arthropoda, sometimes called the Hexapoda. In fact, Hexapoda is a superclass consisting of both Insecta and the related class Entognatha (Parainsecta) (containing the springtails, telsontails, and proturans). Class Insecta is the most diverse group of organisms, containing about 900,000 described species (see table), but there are possibly as many as 5 million to perhaps 20 million actual species of insects. Like other arthropods, they have an external, chitinous covering. Fossil insects dating as early as the Early Devonian have been found. See also: Parainsecta
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