Allen, Robert Thomas Department of Entomology, Academy of Natural Sciences, Drexel University, Philadelphia, Pennsylvania.
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A class of small, elongate, pale, eyeless, centipede-like, soil-dwelling arthropods. Approximately 300 species of the class Symphyla have been described and given scientific names. These species, termed symphylans or symphylids, are arranged into two families—Scutigerellidae (seven genera) and Scolopendrellidae (eight genera). The most common genera and those containing the largest number of species are Scutigerella (Fig. 1), Hanseniella, and Scolopendrella. Symphylans are found on all continents, except Antarctica, and in numerous different habitats and microhabitats. See also: Arthropoda
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