Actinarctus Schulz, 1935 (basis of record)
Actinarctus doryphorus Schulz, 1935 (basis of record)
Actinarctus neretinus Grimaldi de Zio, D'Addabbo Gallo, Morone de Lucia, Vaccarella & Grimaldi, 1982 (basis of record)
Actinarctus physophorus Grimaldi de Zio, D'Addabbo Gallo, Morone de Lucia, Vaccarella & Grimaldi, 1982 (basis of record)
Bathyechiniscus Steiner, 1926 (basis of record)
Bathyechiniscus hallasi (Kristensen, 1977) accepted as Styraconyx hallasi Kristensen, 1977 (basis of record)
Batillipedidae Ramazzotti, 1962 (basis of record)
Batillipes Richters, 1909 (basis of record)
Batillipes acaudatus Pollock, 1971 (basis of record)
Batillipes adriaticus Grimaldi de Zio, Morone de Lucia, D'Addabbo Gallo & Grimaldi, 1979 (basis of record)
Batillipes africanus Morone De Lucia, D' Addabbo Gallo & Grimaldi de Zio, 1988 (basis of record)
Batillipes annulatus de Zio, 1962 (basis of record)
Batillipes bullacaudatus McGinty & Higgins, 1968 (basis of record)
Batillipes carnonensis Fize, 1957 (basis of record)
Batillipes littoralis Renaud-Debyser, 1959 (basis of record)
Batillipes marcelli Morone de Lucia, D'Addabbo Gallo & Grimaldi de Zio, 1988 (basis of record)
Batillipes mirus Richters, 1909 (basis of record)
Batillipes noerrevangi Kristensen, 1978 (basis of record)
Batillipes pennaki Marcus, 1946 (basis of record)
Batillipes phreaticus Renaud-Debyser, 1959 (basis of record)
Batillipes roscoffensis Kristensen, 1978 (basis of record)
Batillipes similis Schulz, 1955 (basis of record)
Batillipes tubernatis Pollock, 1971 (basis of record)
Coronarctidae Renaud-Mornant, 1974 (basis of record)
Coronarctus Renaud-Mornant, 1974 (basis of record)
Coronarctus laubieri Renaud-Mornant, 1987 (basis of record)
Coronarctus stylisetus Renaud-Mornant, 1987 (basis of record)
Coronarctus tenellus Renaud-Mornant, 1974 (basis of record)
Echiniscoides Plate, 1888 (basis of record)
Echiniscoides bruni D'Addabbo Gallo, Grimaldi de Zio, Morone de Lucia & Troccoli, 1992 (basis of record)
Echiniscoides hoepneri Kristensen & Hallas, 1980 (basis of record)
Echiniscoides sigismundi (M. Schultze, 1865) (basis of record)
Echiniscoididae Kristensen & Hallas, 1980 (basis of record)
Eutardigrada (basis of record)
Exoclavarctus Renaud-Mornant, 1983 (basis of record)
Exoclavarctus dineti Renaud-Mornant, 1983 (basis of record)
Florarctus Delamare Deboutteville & Renaud-Mornant, 1965 (basis of record)
Florarctus acer Renaud-Mornant, 1989 (basis of record)
Florarctus asper Renaud-Mornant, 1989 (basis of record)
Florarctus cinctus Renaud-Mornant, 1976 (basis of record)
Florarctus hulingsi Renaud-Mornant, 1976 (basis of record)
Florarctus salvati Delamare Deboutteville & Renaud-Mornant, 1965 (basis of record)
Florarctus stellatus Renaud-Mornant, 1989 (basis of record)
Halechiniscidae Thulin, 1928 (basis of record)
Halechiniscus Richters, 1908 (basis of record)
Halechiniscus chafarinensis Grimaldi de Zio & Villora Moreno, 1995 (basis of record)
Halechiniscus flabellatus Grimaldi de Zio, D'Addabbo Gallo, Morone de Lucia, Vaccarella & Grimaldi, 1982 accepted as Chrysoarctus flabellatus (Grimaldi de Zio, D'Addabbo Gallo, Morone de Lucia, Vaccarella & Grimaldi, 1982) (basis of record)
Halechiniscus greveni Renaud-Mornant & Deroux, 1976 (basis of record)
Halechiniscus guiteli Richters, 1908 (basis of record)
Halechiniscus intermedius Renaud-Mornant, 1967 accepted as Wingstrandarctus intermedius (Renaud-Mornant, 1967) (basis of record)
Halechiniscus macrocephalus Grimaldi de Zio, D'Addabbo Gallo & Morone De Lucia, 1988 (basis of record)
Halechiniscus paratuleari Grimaldi de Zio, D'Addabbo Gallo & Morone De Lucia, 1988 (basis of record)
Halechiniscus perfectus Schulz, 1955 (basis of record)
Halechiniscus remanei Schulz, 1955 (basis of record)
Halobiotus Kristensen, 1982 (basis of record)
Halobiotus arcturulius Crisp & Kristensen, 1983 (basis of record)
Halobiotus crispae Kristensen, 1982 (basis of record)
Halobiotus geddesi (Hallas, 1971) (basis of record)
Halobiotus stenostomus (Richters, 1908) (basis of record)
Hemitanarctus de Zio Grimaldi, d'Addabbo Gallo, Morone de Lucia & Troccoli, 1996 (basis of record)
Hemitanarctus chimaera de Zio Grimaldi, D'Addabbo Gallo, Morone De Lucia & Troccoli, 1995/96 accepted as Dipodarctus borrori Pollock, 1995 (basis of record)
Heterotardigrada (basis of record)
Hypsibiidae Pilato, 1969 (basis of record)
Megastygarctides McKirdy, Schmidt & McGinty-Bayly, 1976 (basis of record)
Megastygarctides setoloso Morgan & O'Reilly, 1989 (basis of record)
Mesostygarctus Renaud-Mornant, 1979 (basis of record)
Mesostygarctus intermedius Renaud-Mornant, 1979 (basis of record)
Neoarctus de Zio Grimaldi, D'Addabbo Gallo & Morone De Lucia, 1992 (basis of record)
Neoarctus primigenius de Zio Grimaldi, D'Addabbo Gallo & Morone De Lucia, 1992 (basis of record)
Neostygarctus Grimaldi de Zio, d'Addabbo Gallo & Morone de Lucia, 1982 (basis of record)
Neostygarctus acanthophorus Grimaldi de Zio, D'Addabbo Gallo & Morone de Lucia, 1982 (basis of record)
Orzeliscus du Bois-Reymond Marcus, 1952 (basis of record)
Orzeliscus belopus du Bois-Reymond Marcus, 1952 (basis of record)
Orzeliscus septentrionalis Schulz, 1953 accepted as Orzeliscus belopus du Bois-Reymond Marcus, 1952 (basis of record)
Parastygarctus Renaud-Debyser, 1965 (basis of record)
Parastygarctus biungulatus Morone de Lucia, Grimaldi de Zio & d'Addabbo Gallo, 1984 (basis of record)
Parastygarctus sterreri Renaud-Mornant, 1970 (basis of record)
Paratanarctus D'Addabbo Gallo, Grimaldi de Zio, Morone de Lucia & Troccoli, 1992 (basis of record)
Paratanarctus kristenseni D'Addabbo Gallo, Grimaldi de Zio, Morone de Lucia & Troccoli, 1992 (basis of record)
Pleocola Cantacuzène, 1951 (basis of record)
Pleocola limnoriae Cantacuzène, 1951 (basis of record)
Raiarctus Renaud-Mornant, 1981 (basis of record)
Raiarctus aureolatus Renaud-Mornant, 1981 (basis of record)
Raiarctus variabilis D'Addabbo Gallo, Grimaldi de Zio & Morone De Lucia, 1986 (basis of record)
Renaudarctidae Kristensen & Higgins, 1984 (basis of record)
Stygarctidae Schulz, 1951 (basis of record)
Stygarctus Schulz, 1951 (basis of record)
Stygarctus bradypus Schulz, 1951 (basis of record)
Styraconyx Thulin, 1942 (basis of record)
Styraconyx craticulus (Pollock, 1983) (basis of record)
Styraconyx hallasi Kristensen, 1977 (basis of record)
Styraconyx haploceros Thulin, 1942 (basis of record)
Styraconyx kristenseni Renaud-Mornant, 1981 (basis of record)
Styraconyx nanoqsunguak Kristensen & Higgins, 1984 (basis of record)
Styraconyx paulae Robotti, 1971 (basis of record)
Styraconyx qivitoq Kristensen & Higgins, 1984 (basis of record)
Styraconyx sardiniae D'Addabbo Gallo, Morone de Lucia & Grimaldi de Zio, 1989 (basis of record)
Styraconyx sargassi Thulin, 1942 (basis of record)
Styraconyx testudo D'Addabbo Gallo, Grimaldi de Zio & Morone de Lucia, 1984 (basis of record)
Styraconyx tyrrhenus D'Addabbo Gallo, Morone de Lucia & Grimaldi de Zio, 1989 (basis of record)