Arthrotardigrada are an order of tardigrades, first described by Marcus in 1927. It consists of the following families:
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.
The Halechiniscidae are a family of tardigrades. The family was named and first described by Gustav Thulin in 1928.
Neoarctus primigenius is a species of tardigrade. It is the only species in the genus Neoarctus, which is the only genus in the family Neoarctidae. The genus and species were first described and named by Grimaldi de Zio, D'Addabbo Gallo and Morone De Lucia in 1992. The authors first placed the genus in the family Stygarctidae, but it was moved to a separate family in 1998.
Halechiniscus is a genus of tardigrades in the family Halechiniscidae. It was named and described by Ferdinand Richters in 1908.
Orzeliscus is a genus of tardigrades in the family Halechiniscidae. The genus was named and described by Eveline Du Bois-Reymond Marcus in 1952.
Florarctus is a genus of tardigrades, in the subfamily Florarctinae which is part of the family Halechiniscidae. The genus was named and described by Claude Delamare Deboutteville and Jeanne Renaud-Mornant in 1965.
Euclavarctus is a genus of tardigrades, in the subfamily Euclavarctinae which is part of the family Halechiniscidae. The genus was named and described by Jeanne Renaud-Mornant in 1975.
Clavarctus falculus is a species of tardigrades. It is the only species in the genus Clavarctus, part of the family Halechiniscidae. The species has been found in deep sea in the Mozambique Channel.
Proclavarctus fragilis is a species of tardigrades. It is the only species in the genus Proclavarctus, part of the family Halechiniscidae. The species has been found in deep sea in the Mozambique Channel and the Bay of Biscay.
Angursa is a genus of tardigrades in the family Styraconyxidae. The genus was named and described by Leland W. Pollock in 1979.
Ligiarctus is a genus of tardigrades, in the subfamily Florarctinae which is part of the family Halechiniscidae. The genus was named and described by Jeanne Renaud-Mornant in 1982.
Rhomboarctus is a genus of tardigrades in the family Styraconyxidae. The genus was named and first described by Renaud-Mornant in 1984.
Wingstrandarctus is a genus of tardigrades, in the subfamily Florarctinae which is part of the family Halechiniscidae. The genus was named and described by Kristensen in 1984.
Parmursa is a genus of tardigrades, in the subfamily Euclavarctinae which is part of the family Halechiniscidae. The genus was named and described by Jeanne Renaud-Mornant in 1984.
Exoclavarctus is a genus of tardigrades in the family Halechiniscidae. Its only species is Exoclavarctus dineti. The species has been found in the deep sea in the Bay of Biscay.
Chrysoarctus is a genus of tardigrades, in the subfamily Halechiniscinae which is part of the family Halechiniscidae. The genus was named and described by Jeanne Renaud-Mornant in 1984.
Opydorscus fonsecae is a species of tardigrades. It is the only species in the genus Opydorscus, part of the family Halechiniscidae and the subfamily Orzeliscinae. The species has been found on the Brazilian coast of the South Atlantic Ocean. The genus and the species were named by Jeanne Renaud-Mornant in 1983.
Paradoxipus orzeliscoides is a species of tardigrade. It is the only species in the genus Paradoxipus, part of the family Halechiniscidae and the subfamily Orzeliscinae. The species has been found in the coastal waters of the southeastern United States, in the western part of the Atlantic Ocean. The genus and the species were named and described by Reinhardt Kristensen and Robert P. Higgins in 1989.
Moebjergarctus is a genus of tardigrades in the family Halechiniscidae.
