Order Plectida Malakhov 1982

Family Plectidae Örley 1880

Genus Anaplectus De Coninck et Stekhoven 1933

• Anaplectus granulosus (Bastian 1865) – marine, supralittoral, free-living, dominant – own data

Cемейство Leptolaimidae Örley 1880

Genus Alaimella Cobb 1920

• Alaimella cincta Cobb 1920 – marine, sublittoral, free-living, rare. – Чесунов, Милютин, 2007.
• Alaimella macramphis Tchesunov & Miljutin 2007 – marine, sublittoral, free-living, rare. – Чесунов, Милютин, 2007.

Genus Camacolaimus De Man 1889

• Camacolaimus tardus De Man 1889 – marine, sublittoral, free-living, rare – own data

Genus Deontolaimus De Man 1880

• Deontolaimus papillatus De Man 1880 – marine, supralittoral, free-living, common – own data

Genus Leptolaimus De Man 1876

• Leptolaimus elegans (Stekhoven et De Coninck 1933) – marine, sublittoral, free-living, rare – own data
• Leptolaimus papilliger De Man 1876 – marine, littoral, free-living, common – own data

Family Ohridiidae Andrássy 1976

Genus Domorganus T. Goodey 1947

• Domorganus beklemishevi Valovaya 1989 – type locality, marine, supralittoral, symbiont of oligochaetes Enchytraeus albidus, common – Валовая, 1989.
• Domorganus oligochaetophilus von Thun 1967 – marine, supralittoral, symbiont oligochaetes Enchytraeus albidus, common – Валовая, 1989.

Family Peresianidae Vitiello et De Coninck 1968

Genus Manunema Gerlach 1957

• Manunema proboscidis Gerlach 1957 – marine, sublittoral, free-living, rare – own data

Family Ceramonematidae Cobb 1933

Genus Dasynemella Cobb 1933

• Dasynemella riemanni Haspeslagh 1973 – marine, sublittoral, free-living, rare. – Tchesunov & Miljutina, 2002.

Genus Pselionema Cobb 1933

• Pselionema simplex De Coninck 1942 – marine, sublittoral, free-living, common – Tchesunov, 1995; Tchesunov & Miljutina, 2002.

Family Cyartonematidae Tchesunov 1990

Genus Cyartonema Cobb 1920

• Cyartonema doris Tchesunov 1989 – type locality, marine, sublittoral, free-living, rare. – Чесунов, 1989.
• Cyartonema parvulum Tchesunov 1989 – type locality, marine, sublittoral, rare, free-living – Чесунов, 1989.
• Cyartonema zosterae (Allgén 1929) – marine, sublittoral, rare, free-living – Чесунов, 1989.

Family Diplopeltoididae Tchesunov 1990

Genus Diplopeltoides Gerlach 1962

• Diplopeltoides anatolii (Voronov 1982) – type locality, marine, sublittoral, free-living, common – Воронов, 1982.
• Diplopeltoides nudus (Gerlach 1956) – marine, sublittoral, free-living, rare – own data
• Diplopeltoides ornatus (Gerlach 1950) – marine, sublittoral, free-living, rare – own data
• Diplopeltoides striatus (Gerlach 1956) – marine, sublittoral, free-living, rare. - own data

Family Meyliidae De Coninck 1965

Genus Gerlachius Andrássy 1976

• Gerlachius lissus (Gerlach 1956) – marine, sublittoral, free-living, rare. – Tchesunov, 1994.

Family Paramicrolaimidae Lorenzen 1981

Genus Paramicrolaimus Wieser 1954

• Paramicrolaimus mirus Tchesunov 1988б – type locality, marine, sublittoral, free-living, rare. – Чесунов, 1988б.

Family Tarvaiidae Lorenzen 1981

Genus Tarvaia Allgén 1934

• Tarvaia heegeri Jensen 1991 – marine, sublittoral, free-living, rare – own data

Family Tubolaimoididae Lorenzen 1981

Genus Chitwoodia Gerlach 1956

• Chitwoodia tenuipharyngealis Tchesunov 1993 – type locality, marine, sublittoral, free-living, rare. – Tchesunov, 1993.

Genus Tubolaimoides Gerlach 1963

• Tubolaimoides tenuicaudatus (Allgén 1934) – marine, sublittoral, free-living, rare. - Tchesunov, 1993.

rus:Отряд Plectida Malakhov 1982