The Stygarctidae are a family of tardigrades. The family was first described by Schulz in 1951. The genus Neoarctus was first placed in the family Stygarctidae, but it was moved to a separate family, Neoarctidae, in 1998.Bello & Grimaldi de Zio (1998), Phylogeny of the genera of the Stygarctidae and related families (Tardigrada: Heterotardigrada). Zoologischer Anzeiger, vol. 237, p. 171-183.
Subfamilies and genera They are divided into the following subfamilies and genera: Megastygarctidinae Bello & de Zio Grimaldi, 1998: Megastygarctides McKirdy, Schmidt & McGinty-Bayly, 1976 Stygarctinae Schulz, 1951: Faroestygarctus Hansen, Kristensen & Jørgensen, 2012 Mesostygarctus Renaud-Mornant, 1979 Parastygarctus Renaud-Debyser, 1965 Prostygarctus Rubal, Veiga, Fontoura & Sousa-Pinto, 2013 Pseudostygarctus McKirdy, Schmidt & McGinty-Bayly, 1976 Stygarctus Schulz, 1951
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