FAMILY Sphaerolaimidae Filipjev, 1918 [ref. Fadeeva 1982; Chesunov 1980 p.981] GENUS Buccolaimus Allgén, 1960:494 SPECIES Buccolaimus grahami Allgén, 1959 GENUS Doliolaimus Lorenzen, 1966 SPECIES Doliolaimus agilis Lorenzen, 1966 GENUS Hofmaenneria Schneider, 1940 SPECIES Hofmaenneria brachystoma (Hofmänner in Hofmänner & Menzel, 1914) [Diagnostic; Alekseev 1983 p.1611] [=Cylindrolaimus brachystoma Hofmänner in Hofmänner & Menzel, 1914] [=Desmolaimus thienemanni Micoletzky, 1922] SPECIES Hofmaenneria elongatus Gagarin, 1987:454 SPECIES Hofmaenneria gratiosa Alekseev, 1983:1609 SPECIES Hofmaenneria hazenensis Mulvey, 1969 SPECIES Hofmaenneria keoladeoensis Khan, Hussain, Sultana & Tahseen, 2005:70 SPECIES Hofmaenneria longicaudata Gagarin, 1999:206 [Yaroslavl Province, Borok] SPECIES Hofmaenneria niddensis (Skwarra, 1921) [Diagnostic; Gagarin 1987 p.454] [=Cylindrolaimus niddensis Skwarra, 1921] SPECIES Hofmaenneria optata Alekseev, 1983:1610 GENUS Megalamphis de Coninck, 1965 TYPE SPECIES Megalamphis sphaerolaimoides (Timm, 1961) [=Macramphis sphaerolaimoides Timm, 1961] GENUS Metasphaerolaimus Gourbault & Boucher, 1982:1045 [=Ceratosphaerolaimus Fadeeva, 1983:1329] [as 1982; syn. Jensen 1992 p.8] SPECIES Metasphaerolaimus badalis (Freudenhammer, 1975) [syn. Fadeeva 1982 p.1329] [=Sphaerolaimus badalis Freudenhammer, 1975] SPECIES Metasphaerolaimus campbelli (Allgén, 1927) [syn. Fadeeva 1982 p.1329] [=Sphaerolaimus campbelli Allgén, 1927] SPECIES Metasphaerolaimus cancellatus Gourbault & Boucher, 1982:1045 SPECIES Metasphaerolaimus crassicauda (Freudenhammer, 1975) [described by Jensen 1992 p.11; syn. Fadeeva 1982 p.1329 as Ceratosphaerolaimus; Diagnostic; Sergeeva 1981 p.1579] [=Sphaerolaimus crassicauda Freudenhammer, 1975] SPECIES Metasphaerolaimus gerlachi Jensen, 1992:11 SPECIES Metasphaerolaimus hamatus Gourbault & Boucher, 1982:1048 [described by Jensen 1992 p.13] SPECIES Metasphaerolaimus horrendus (Sergeeva, 1981):1578 [syn. Fadeeva 1982 p.1329] [=Sphaerolaimus horrendus Sergeeva, 1981] SPECIES Metasphaerolaimus inglisi Gourbault & Boucher, 1982:1050 SPECIES Metasphaerolaimus japonicus (Fadeeva, 1983):1329 [=Ceratosphaerolaimus japonicus Fadeeva, 1983] GENUS Parasphaerolaimus Ditlevsen, 1918 SPECIES Parasphaerolaimus antiae Jensen, 1992:7 GENUS Sphaerolaimus Bastian, 1865c [=Euthoracostomopsis Sergeeva, 1974] [syn. Lorenzen 1978 p.67] SPECIES Sphaerolaimus abeskunus Chesunov, 1980:983 SPECIES Sphaerolaimus abyssorum Allgén, 1933 SPECIES Sphaerolaimus anterides Inglis, 1961 SPECIES Sphaerolaimus arcospiculum Allgén, 1959 SPECIES Sphaerolaimus asetosus Allgén, 1952 SPECIES Sphaerolaimus balticus G. Schneider, 1906 [Redescription; Jensen 1979 p.152; Diagnostic; Chesunov 1987 p.39] [=Sphaerolaimus bretonicus Kreis, 1929] [=Sphaerolaimus ditlevseni Kreis, 1924] SPECIES Sphaerolaimus brevicollis Ssaweljev, 1912 SPECIES Sphaerolaimus caspius Chesunov, 1980:984 SPECIES Sphaerolaimus crenellatus Warwick, 1973 SPECIES Sphaerolaimus cuneatus Paramonov, 1929 [Diagnostic; Chesunov 1980 p.982] SPECIES Sphaerolaimus duplex Allgén, 1952 SPECIES Sphaerolaimus ferulaceus Gourbault & Boucher, 1982:1042 SPECIES Sphaerolaimus glaphyrus Vitiello, 1971 SPECIES Sphaerolaimus gracilis de Man, 1876 [Redescription Turpeenniemi 1997 p.72] [=Sphaerolaimus buetschlii Schulz, 1932] [=Sphaerolaimus demani Filipjev, 1922] [=Cothonolaimus tenuis Kreis, 1924] [syn. Lorenzen 1978 p.68] TYPE SPECIES Sphaerolaimus hirsutus Bastian, 1865c SPECIES Sphaerolaimus hirticollis Cobb, 1898 SPECIES Sphaerolaimus islandicus Ditlevsen, 1926 [=Sphaerolaimus sabulosus Schulz, 1932] SPECIES Sphaerolaimus kleini Jensen, 1992:4 SPECIES Sphaerolaimus latilaimus Allgén, 1958 SPECIES Sphaerolaimus limosus Fadeeva, 1982:1321 SPECIES Sphaerolaimus lodosus Gerlach, 1956 SPECIES Sphaerolaimus lutarius Gourbault & Boucher, 1982:1039 SPECIES Sphaerolaimus macrocirculoides Wieser, 1954 SPECIES Sphaerolaimus macrocirculus Filipjev, 1918 SPECIES Sphaerolaimus maeoticus Filipjev, 1922 SPECIES Sphaerolaimus makrolasius Schulz, 1932 SPECIES Sphaerolaimus megamphis Wieser, 1956 SPECIES Sphaerolaimus micropapillatus Tchesunov & Miljutin, 2006:58 [Arctic Ocean] SPECIES Sphaerolaimus minutus Vitiello, 1971 SPECIES Sphaerolaimus occidentalis Turpeenniemi, 1997:67 [Bothnian Bay] SPECIES Sphaerolaimus ostreae Filipjev, 1918 SPECIES Sphaerolaimus pacificus Allgén, 1947 SPECIES Sphaerolaimus papillatus Kreis, 1929 SPECIES Sphaerolaimus paradoxus (Ditlevsen, 1918) [=Parasphaerolaimus paradoxus Ditlevsen, 1918] SUBSPECIES Sphaerolaimus crassus Timm, 1971 SUBSPECIES Sphaerolaimus paradoxus (Ditlevsen, 1918) [=Parasphaerolaimus paradoxus Ditlevsen, 1918] [=Sphaerolaimus dispar Filipjev, 1918] [syn. Lorenzen 1978 p.71] [=Parasphaerolaimus polaris Filipjev, 1946] [syn. Lorenzen 1978 p.71] SPECIES Sphaerolaimus paragracilis Vitiello, 1971 SPECIES Sphaerolaimus penicillus Gerlach, 1956 SUBSPECIES Sphaerolaimus penicillus Gerlach, 1956 SUBSPECIES Sphaerolaimus pugetensis Wieser, 1959 SPECIES Sphaerolaimus pentasetus Pastor-de Ward, 1984:2 [Argentina, Santa Cruz, Ria Deseado, Embarcadero] SPECIES Sphaerolaimus profundus Vitiello, 1971 SPECIES Sphaerolaimus setosus Paramonov, 1927 SPECIES Sphaerolaimus solivagus Galtsova, Platonova, Streltsova & Petukhov, 1980:23 SPECIES Sphaerolaimus striatus Allgén, 1935 SPECIES Sphaerolaimus Tchesunov, 1980 [Description; Chesunov 1987 p.41] SPECIES Sphaerolaimus uncinatus Freudenhammer, 1970 SPECIES Sphaerolaimus valentinae Tchesunov in Chesunov, 1987:37 GENUS Subsphaerolaimus Lorenzen, 1978:64 SPECIES Subsphaerolaimus brevicauda Jensen, 1992:3 SPECIES Subsphaerolaimus gerlachi (Wieser, 1959) [syn. Lorenzen 1978 p.64] [=Sphaerolaimus gerlachi Wieser, 1959] SPECIES Subsphaerolaimus lamasus (Gerlach, 1956) [syn. Lorenzen 1978 p.64] [=Sphaerolaimus lamasus Gerlach, 1956] SPECIES Subsphaerolaimus litoralis Lorenzen, 1978:64 SPECIES Subsphaerolaimus seticaudatus Gourbault & Boucher, 1982:1043