Acanthonchus Cobb, 1920 (original description)
Acanthonchus viviparus Cobb, 1920 accepted as Acanthonchus (Acanthonchus) viviparus Cobb, 1920 (original description)
Actinonema Cobb, 1920 (original description)
Actinonema pachydermatum Cobb, 1920 (original description)
Alaimella Cobb, 1920 (original description)
Alaimella cincta Cobb, 1920 (original description)
Alaimella truncata Cobb, 1920 (original description)
Alaimonema Cobb, 1920 (original description)
Alaimonema multicinctum Cobb, 1920 (original description)
Amphispira Cobb, 1920 (original description)
Amphispira rotundicephala Cobb, 1920 (original description)
Anaxonchium Cobb, 1920 accepted as Pomponema Cobb, 1917 (original description)
Anaxonchium litorium Cobb, 1920 accepted as Pomponema litorium (Cobb, 1920) Lorenzen, 1972 (original description)
Anoncholaimus Cobb, 1920 (original description)
Anoncholaimus mobilis Cobb, 1920 (original description)
Anticyathus Cobb, 1920 (original description)
Anticyathus tenuicaudatus Cobb, 1920 (original description)
Anticyclus Cobb, 1920 (original description)
Anticyclus exilis Cobb, 1920 (original description)
Antomicron Cobb, 1920 (original description)
Antomicron pellucidum Cobb, 1920 (original description)
Apodontium Cobb, 1920 (original description)
Apodontium pacificum Cobb, 1920 (original description)
Aponchium Cobb, 1920 (original description)
Aponchium cylindricolle Cobb, 1920 (original description)
Asymmetrella Cobb, 1920 (original description)
Asymmetrella glabra Cobb, 1920 (original description)
Axonchium Cobb, 1920 (original description)
Axonchium (Axonchium) Cobb, 1920 accepted as Axonchium Cobb, 1920 (original description)
Axonchium amplicolle Cobb, 1920 (original description)
Belbolla Andrássy, 1973 (original description)
Blattophila Cobb, 1920 (original description)
Bolbella Cobb, 1920 accepted as Belbolla Andrássy, 1973 (original description)
Bolbella tenuidens Cobb, 1920 accepted as Belbolla tenuidens (Cobb, 1920) Andrássy, 1973 (original description)
Bolbinium Cobb, 1920 (original description)
Bolbolaimus Cobb, 1920 (original description)
Bolbolaimus pellucidus Cobb, 1920 accepted as Chromaspirina pellucida (Cobb, 1920) Luc & Deconinck, 1959 (original description)
Bolbolaimus punctatus Cobb, 1920 (original description)
Bolbonema Cobb, 1920 (original description)
Bolbonema brevicolle Cobb, 1920 (original description)
Campydora Cobb, 1920 (original description)
Campydora demonstrans Cobb, 1920 (original description)
Campylaimus Cobb, 1920 (original description)
Campylaimus inaequalis Cobb, 1920 (original description)
Catalaimus Cobb, 1920 accepted as Calyptronema Marion, 1870 (original description)
Catalaimus acuminatus Cobb, 1920 accepted as Calyptronema cobbi (Cobb, 1920) Wieser, 1953 (original description)
Cephalobellus Cobb, 1920 (original description)
Cephalobellus papilliger Cobb, 1920 (original description)
Cephalobium Cobb, 1920 (original description)
Ceramonema Cobb, 1920 (original description)
Ceramonema attenuatum Cobb, 1920 (original description)
Chambersiella Cobb, 1920 (original description)
Choronema Cobb, 1920 (original description)
Chromaspirina punctata (Cobb, 1920) accepted as Pomponema punctata (Cobb, 1920) Luc & Deconinck, 1959 (original description)
Cinctonema Cobb, 1920 (original description)
Cinctonema tenue Cobb, 1920 (original description)
Coinonema Cobb, 1920 accepted as Araeolaimus de Man, 1888 (original description)
Coinonema punctatum Cobb, 1920 accepted as Araeolaimus punctatus (Cobb, 1920) accepted as Araeolaimus elegans de Man, 1888 (original description)
Cophonchus Cobb, 1920 accepted as Phanoderma Bastian, 1865 (original description)
Cophonchus ocellatus Cobb, 1920 (original description)
Crystallonema Cobb, 1920 accepted as Paralinhomoeus de Man, 1907 accepted as Linhomoeus Bastian, 1865 (original description)
Crystallonema fuscacephalum Cobb, 1920 accepted as Paralinhomoeus fuscacephalum (Cobb, 1920) Gerlach, 1963 accepted as Linhomoeus fuscacephalum (Cobb, 1920) Gerlach, 1963 (original description)
Crystallonema simile Cobb, 1920 accepted as Paralinhomoeus similis (Cobb, 1920) Gerlach, 1963 (original description)
Cyartonema Cobb, 1920 (original description)
Cyartonema flexile Cobb, 1920 (original description)
Cynura Cobb, 1920 (original description)
Cynura uniformis Cobb, 1920 (original description)
Cytolaimium Cobb, 1920 (original description)
Cytolaimium exile Cobb, 1920 (original description)
Dactylaimus Cobb, 1920 (original description)
Dactylaimus aequalis Cobb, 1920 (original description)
Daptonema Cobb, 1920 (original description)
Daptonema fimbriatus (Cobb, 1920) Hopper, 1969 (original description)
Daptonema fissidens Cobb, 1920 (original description)
Dasynema Cobb, 1920 accepted as Dasynemella Cobb, 1933 (original description)
Dasynema sexalineatum Cobb, 1920 accepted as Dasynemella sexalineata (Cobb, 1920) Tchesunov & Miljutina, 2002 (original description)
Desmodora (Croconema) Cobb, 1920 accepted as Croconema Cobb, 1920 (original description)
Didelta Cobb, 1920 (original description)
Didelta maculatum Cobb, 1920 (original description)
Digitonchus Cobb, 1920 accepted as Deontolaimus de Man, 1880 (original description)
Digitonchus uniformis Cobb, 1920 accepted as Deontolaimus uniformis (Cobb, 1920) Holovachov & Boström, 2015 (original description)
Dorylaimopsis perfectus 1920 accepted as Dorylaimopsis perfecta (Cobb, 1920) (original description)
Dorylaimus (Axonchium) Cobb, 1920 accepted as Axonchium Cobb, 1920 (original description)
Dorylaimus (Doryllium) Cobb, 1920 accepted as Doryllium Cobb, 1920 (original description)
Doryllium Cobb, 1920 (original description)
Doryllium uniforme Cobb, 1920 (original description)
Gammanema Cobb, 1920 (original description)
Gonionchus Cobb, 1920 (original description)
Gonionchus villosus Cobb, 1920 (original description)
Halalaimus pachydermatus (Cobb, 1920) Schneider, 1939 (ecology source)
Halanonchus Cobb, 1920 (original description)
Halanonchus macrurus Cobb, 1920 (original description)
Halinema Cobb, 1920 (original description)
Halinema spinosum Cobb, 1920 (original description)
Hyalaimus Cobb, 1920 (original description)
Illium Cobb, 1920 (original description)
Illium exile Cobb, 1920 (original description)
Ionema Cobb, 1920 (original description)
Ionema ocellatum Cobb, 1920 accepted as Ionema cobbi (Steiner, 1916) Micoletzky, 1924 (original description)
Iotadorus Cobb, 1920 accepted as Hypodontolaimus de Man, 1886 (original description)

Atlantic Coast of Florida for Coinonema punctatum Cobb, 1920 
Atlantic Coast of United States of America for Digitonchus uniformis Cobb, 1920 
Atlantic Coast of United States of America for Nemella ocellata Cobb, 1920 
Atlantic Coast of United States of America for Onchulella ocellata Cobb, 1920 
Atlantic Coast of United States of America for Polylaimium exile Cobb, 1920 
Atlantic Coast of United States of America for Rhadinema flexile Cobb, 1920 
Biscayne Bay for Calyptronema cobbi (Cobb, 1920) Wieser, 1953 
California for Acanthonchus viviparus Cobb, 1920 
Costa Rican part of the North Pacific Ocean for Iotadorus punctulatus Cobb, 1920 
Costa Rican part of the North Pacific Ocean for Micromicron cephalatum Cobb, 1920 
Costa Rican part of the North Pacific Ocean for Pseudolella cephalata Cobb, 1920 
Costa Rican part of the North Pacific Ocean for Zygonemella striata Cobb, 1920 
East Indies for Symplocostoma acutum (Cobb, 1920) Wieser, 1953 
Florida for Crystallonema simile Cobb, 1920 
Florida Bay for Cytolaimium exile Cobb, 1920 
Gulf of Mexico for Neurella simplex Cobb, 1920 
Jamaican Exclusive Economic Zone for Xenonema Cobb, 1920 
Massachusetts for Bolbolaimus punctatus Cobb, 1920 
Massachusetts for Polysigma uniforme Cobb, 1920 
Massachusetts Bay for Nudora lineata Cobb, 1920 
New Hebrides for Rhinema retrorsum Cobb, 1920 
New Jersey for Anaxonchium litorium Cobb, 1920 
New Jersey for Bolbolaimus pellucidus Cobb, 1920 
Peruvian Exclusive Economic Zone for Apodontium pacificum Cobb, 1920 
USA for Pycnolaimus pygmaeus Cobb, 1920 
Woods Hole for Bolbella tenuidens Cobb, 1920 
Woods Hole for Trileptium guttatum (Cobb, 1920) Gerlach & Riemann, 1974 

Unknown type, verbatimGeounit Bathing Beach, Woods..., identified as Bolbella tenuidens Cobb, 1920
Unknown type, geounit Corfu, identified as Campydora demonstrans Cobb, 1920

 Biology

 for Monhystrium transitans Cobb, 1920

Commensal species. In land crabs. [details]

 Biology

 for Monhystrium wilsoni (Baylis, 1915) Cobb, 1920

Commensal species. In land crabs. [details]

 Distribution

 for Apodontium pacificum Cobb, 1920

Mollendo and Salaveny, coast of Peru, S. A.. [details]