Stygarctidae

Megastygarctides is a genus of tardigrades, the only one in the subfamily Megastygarctidinae in the family Stygarctidae. The genus was first described and named by McKirdy, Schmidt & McGinty-Bayly in 1976. It was placed in the new subfamily Megastygarctidinae in 1998 by Bello and de Zio Grimaldi.

Parastygarctus is a genus of tardigrades, in the family Stygarctidae. It was first described and named by Jeanne Renaud-Debyser in 1965.

Pseudoastygarctus is a genus of tardigrades in the family Stygarctidae. The genus was first described and named by McKirdy, Schmidt & McGinty-Bayly in 1976.

Stygarctus is a genus of tardigrades in the family Stygarctidae. It was named by Erich Schulz in 1951. The name is a combination of Greek Styx and arktos ("bear").

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.