Order Monhysterida Filipjev 1929

Family Linhomoeidae Filipjev 1922

Genus Desmolaimus de Man 1880

• Desmolaimus zeelandicus De Man 1880 – marine, littoral, free-living, dominant - Чесунов, 1991.

Genus Eleutherolaimus Filipjev 1922

• Eleutherolaimus stenosoma (De Man 1907) – marine, littoral, free-living, dominant – Чесунов, 1991 (= Eleutherolaimus sp.).

Genus Linhomoeus Bastian 1865

• Linhomoeus elongatus Bastian 1865 – marine, sublittoral, free-living, common – own data

Genus Metalinhomoeus De Man 1907

• Metalinhomoeus typicus De Man 1907 – marine, sublittoral, free-living, common – own data

Genus Terschellingia De Man 1888

• Terschellingia longicaudata De Man 1907 – marine, sublittoral, free-living, dominant – Чесунов, 1991.
• Terschellingia distalamphida Yuario 1974 – marine, sublittoral, free-living, dominant, Kastyan island - own data

Family Siphonolaimidae Filipjev 1918

Genus Siphonolaimus De Man 1893

• Siphonolaimus roervikensis Allgén 1946 – marine, sublittoral, free-living, common – own data

Family Fusivermidae Tchesunov 1996

Genus Fusivermis Tchesunov 1996

• Fusivermis fertilis Tchesunov 1996 – type locality, marine, sublittoral, free-living, common – Tchesunov, 1996.

Family Monhysteridae De Man 1876

Genus Diplolaimella Allgén 1929

• Diplolaimella ocellata (Bütschli 1874) – marine, littoral, free-living, common - own data

Genus Diplolaimelloides Meyl 1954

• Diplolaimelloides altherri Meyl 1954 – marine, littoral, free-living, rare – own data

Genus Gammarinema Kinne et Gerlach 1953

• Gammarinema gammari Kinne et Gerlach 1953 – marine, littoral, symbiont of gammarid amphipods, common – Чесунов, Плетникова, 1986.

Genus Geomonhystera Andrássy 1981

• Geomonhystera disjuncta (Bastian 1865) – marine, supralittoral, littoral, free-living, common – own data

Genus Monhystrella Cobb 1918

• Monhystrella anophthalma (Lorenzen 1969) – marine, littoral, free-living, common – own data

Family Xyalidae Chitwood 1951

Genus Amphimonhystera Allgén 1929

• Amphimonhystera anechma (Southern 1914) – marine, sublittoral, free-living, rare – own data
• Amphimonhystera galea Fadeeva 1984 – marine, sublittoral, free-living, rare, Kastyan island - own data

Genus Cobbia De Man 1907

• Cobbia trefusiaeformis De Man 1907 – marine, sublittoral, free-living, common – own data

Genus Daptonema Cobb 1920

• Daptonema kornoeense (Allgén 1929) – marine, sublittoral, free-living, common – own data
• Daptonema modestum Tchesunov 1990 – type locality, marine, sublittoral, free-living, rare, Kastyan island – Чесунов, 1990г.
• Daptonema procerum (Gerlach 1951) – marine, littoral, free-living, common – own data
• Daptonema setosum (Bütschli 1874) – marine, littoral, free-living, dominant – Чесунов, 1990а.
• Daptonema voskresenskii Tchesunov 1990а – type locality, marine, littoral, free-living, rare. – Чесунов, 1990а.

Genus Filipjeva Ditlevsen 1928

• Filipjeva filipjevi Tchesunov 1988 – type locality, marine, sublittoral, free-living, common, Kastyan island – Чесунов, 1988а.
• Filipjeva teratospicula Tchesunov 1988 – type locality, marine, sublittoral, free-living, rare, Kastyan island – Чесунов, 1988а.

Genus Metadesmolaimus Stekhoven 1935

• Metadesmolaimus similis Tchesunov 1990 – type locality, marine, sublittoral, free-living, common – Чесунов, 1990г.

Genus Paramonhystera Steiner 1916

• Paramonhystera filamentosa (Ditlevsen 1928) – marine, littoral, sublittoral, free-living, common – own data

Genus Pseudosteineria Wieser 1956

• Pseudosteineria ventropapillata Tchesunov 2000 – type locality, marine, sublittoral, free-living, common – Tchesunov, 2000a.

Genus Rhynchonema Cobb 1920

• Rhynchonema lyngei (Allgén 1940) – marine, littoral, free-living, common – Чесунов, 1990в.

Genus Steineria Micoletzky 1922

• Steineria pilosa (Cobb 1914) – marine, sublittoral, free-living, common – Чесунов, 1990а.

Genus Theristus Bastian 1865

• Theristus acer Bastian 1865 – marine, littoral, free-living, rare – own data
• Theristus blandicor Rachor 1971 – marine, littoral, free-living, common – own data
• Theristus flevensis Stekhoven 1935 – marine, littoral, free-living, common – Чесунов, 1990б.
• Theristus pertenuis Bresslau et Stekhoven in Stekhoven 1935 – marine, supralittoral, free-living, dominant – own data

Genus Xyala Cobb 1920

• Xyala striata Cobb 1920 – marine, sublittoral, free-living, rare - own data

Family Sphaerolaimidae Filipjev 1918

Genus Sphaerolaimus Bastian 1865

• Sphaerolaimus balticus G. Schneider 1906 – marine, littoral, free-living, common – Чесунов, 1987.

Genus Parasphaerolaimus Ditlevsen 1918

• Parasphaerolaimus paradoxus Ditlevsen 1918 – marine, sublittoral, free-living, rare – own data

rus:Отряд Monhysterida Filipjev 1929