Abacion Rafinesque, 1820 (additional source)
Abacion tesselatum Rafinesque, 1820 (additional source)
Abacion tesselatum creolum (Chamberlin, 1942) (source of synonymy)
Abacion texensis (Loomis, 1937) (additional source)
Abacionidae Shelley, 1979 (additional source)
Acakandra austrina Loomis, 1964 accepted as Cleidogona austrina (Loomis, 1964) (additional source)
Acentronus Chamberlin, 1943 accepted as Rhysodesmus Cook, 1895 (source of synonymy)
Acentronus minor Chamberlin, 1943 accepted as Rhysodesmus minor (Chamberlin, 1943) (additional source)
Acentronus minor Chamberlin, 1943 accepted as Rhysodesmus minor (Chamberlin, 1943) (source of synonymy)
Aceratophallus calcehtokanus Chamberlin, 1938 (additional source)
Aceratophallus dux Chamberlin, 1914 (additional source)
Aceratophallus guatemalae Chamberlin, 1947 (additional source)
Aceratophallus hoctunanus Chamberlin, 1938 (additional source)
Aceratophallus lamellifer Brölemann, 1905 (additional source)
Aceratophallus maya Loomis, 1964 (additional source)
Aceratophallus oxkutzcabus Chamberlin, 1938 (additional source)
Aceratophallus quadratus Loomis, 1961 (additional source)
Aceratophallus scutigeroides Shear, 1973 (additional source)
Aceratophallus sumucus Chamberlin, 1956 (additional source)
Aceratophallus unicolor Carl, 1902 (additional source)
Aceratophallus unicolor lamellifer Brölemann, 1905 (source of synonymy)
Achromoporus coloratus Loomis, 1936 (additional source)
Achromoporus concolor (Loomis, 1941) (additional source)
Achromoporus enneryensis Loomis, 1936 (additional source)
Achromoporus furcipes Loomis, 1936 (additional source)
Achromoporus heteromus Loomis, 1937 (additional source)
Achromoporus robustus Loomis, 1936 (additional source)
Acutangulus alius Causey, 1973 (additional source)
Acutangulus neglectus Carl, 1903 (additional source)
Acutangulus pictus Causey, 1973 (additional source)
Acutangulus sororius Causey, 1973 (additional source)
Adrityla brevis Causey, 1972 (additional source)
Adrityla cucullata Loomis & Schmitt, 1971 (additional source)
Aenigmopus alatus Loomis & Hoffman, 1962 (additional source)
Agenodesmus reticulatus Loomis, 1934 (additional source)
Aigon Chamberlin, 1949 accepted as Californiulus Verhoeff, 1938 (source of synonymy)
Aigon parvior (Chamberlin, 1940) accepted as Californiulus parvior (Chamberlin, 1940) (source of synonymy)
Aigon rodocki Chamberlin, 1949 accepted as Californiulus parvior (Chamberlin, 1940) (source of synonymy)
Airocaulon humerosum Loomis, 1964 (additional source)
Akacandra Loomis, 1964 accepted as Acakandra Loomis, 1964 accepted as Cleidogona Cook & Collins, 1895 (source of synonymy)
Alakene simplex Chamberlin, 1941 (additional source)
Alcimobolus angustipes Loomis, 1936 accepted as Alcimobolus domingensis (Humbert & De Saussure, 1872) (additional source)
Alcimobolus angustipes Loomis, 1936 accepted as Alcimobolus domingensis (Humbert & De Saussure, 1872) (source of synonymy)
Aliulus caddoensis Causey, 1950 (additional source)
Aliulus carrollus Causey, 1950 (additional source)
Allarithmus parvulus Attems, 1933 (additional source)
Allopocockia Brölemann, 1913 (additional source)
Allopocockia atriculus (Pocock, 1908) accepted as Chelogonobolus atriculus (Pocock, 1908) (source of synonymy)
Allopocockia purulana (Chamberlin, 1922) accepted as Arolus purulanus Chamberlin, 1922 (source of synonymy)
Allopocockia rotundata Kraus, 1954 (additional source)
Allopocockiidae Keeton, 1960 (additional source)
Alloporus americanus Silvestri, 1895 accepted as Orthoporus americanus (Silvestri, 1895) (additional source)
Alloproctinus anisorhabdus Condé & Terver, 1964 accepted as Lophoturus anisorhabdus (Condé & Terver, 1964) (source of synonymy)
Alloproctinus niveus (Loomis, 1934) accepted as Lophoturus niveus (Loomis, 1934) (source of synonymy)
Alloproctus Silvestri, 1948 accepted as Lophoturus Brölemann, 1931 (source of synonymy)
Alloproctus madecassus Marquet & Condé, 1950 accepted as Lophoturus madecassus (Marquet & Condé, 1950) (additional source)
Alloproctus madecassus Marquet & Condé, 1950 accepted as Lophoturus madecassus (Marquet & Condé, 1950) (source of synonymy)
Alocodesmus Silvestri, 1896 (additional source)
Alocodesmus angustatus Silvestri, 1896 (additional source)
Alocodesmus dromeus Chamberlin, 1922 (additional source)
Alpertia lunatifrons Loomis, 1972 accepted as Polydesmus angustus Latzel, 1884 (additional source)
Alpertia lunatifrons Loomis, 1972 accepted as Polydesmus angustus Latzel, 1884 (source of synonymy)
Ameractis Causey, 1959 (additional source)
Ameractis chirogona Enghoff, 1982 (additional source)
Ameractis satis Causey, 1959 (additional source)
Amphelictogon Chamberlin, 1918 (additional source)
Amphelictogon alayoni Peréz-Asso, 1996 (additional source)
Amphelictogon atricolor Loomis, 1938 accepted as Amphelictogon magnus (Bollman, 1888) (additional source)
Amphelictogon bahamiensis Chamberlin, 1918 accepted as Amphelictogon subterraneus bahamiensis Chamberlin, 1918 (source of synonymy)
Amphelictogon couloni (Humbert & De Saussure, 1869) (additional source)
Amphelictogon cubanus Chamberlin, 1918 (additional source)
Amphelictogon dentatus Chamberlin, 1918 (additional source)
Amphelictogon dolius Chamberlin, 1922 accepted as Amphelictogon subterraneus dolius Chamberlin, 1922 (source of synonymy)
Amphelictogon flavipes Chamberlin, 1918 accepted as Amphelictogon cubanus Chamberlin, 1918 (additional source)
Amphelictogon flexus Loomis, 1938 (additional source)
Amphelictogon garridoi Peréz-Asso, 1996 (additional source)
Amphelictogon heteromus Hoffman, 1963 (additional source)
Amphelictogon hoffmani Peréz-Asso, 1996 (additional source)
Amphelictogon juvenis Chamberlin, 1918 (additional source)
Amphelictogon maculatus Chamberlin, 1918 (additional source)
Amphelictogon magnus (Bollman, 1888) (additional source)
Amphelictogon manni Chamberlin, 1918 (additional source)
Amphelictogon obscurus Chamberlin, 1918 (additional source)
Amphelictogon pallidipes Chamberlin, 1918 (additional source)
Amphelictogon pinetorum Chamberlin, 1922 accepted as Amphelictogon subterraneus pinetorum Chamberlin, 1922 (additional source)
Amphelictogon pinetorum Chamberlin, 1922 accepted as Amphelictogon subterraneus pinetorum Chamberlin, 1922 (source of synonymy)
Amphelictogon propinquus Loomis, 1938 (additional source)
Amphelictogon rex Loomis, 1941 (additional source)
Amphelictogon rubripes Chamberlin, 1918 accepted as Amphelictogon cubanus Chamberlin, 1918 (additional source)
Amphelictogon strumosus Loomis, 1938 (additional source)
Amphelictogon subterraneus (De Saussure, 1859) (source of synonymy)
Amphelictogon subterraneus bahamiensis Chamberlin, 1918 (additional source)
Amphelictogon subterraneus pinetorum Chamberlin, 1922 (additional source)
Amphelictogon thomasi Peréz-Asso, 1996 (additional source)
Amphelictogon zygethus Chamberlin, 1918 accepted as Amphelictogon cubanus Chamberlin, 1918 (additional source)
Amplaria causeyae (Chamberlin, 1940) accepted as Striaria causeyae Chamberlin, 1940 (source of synonymy)
Amplaria eutypa Chamberlin, 1941 (source of synonymy)
Amplaria nazinta (Chamberlin, 1910) (source of synonymy)
Amplinus areatus Pocock, 1910 (additional source)
Amplinus armatus Pocock, 1910 (additional source)

Arkansas for Ethojulus Chamberlin, 1918 
California for Conotyloidea Cook, 1896 
California for Tuniulus milpitanus (Chamberlin, 1940) 
Chiapas for Solaenogona Hoffman, 1950 
El Salvador for Allopocockiidae Keeton, 1960 
El Salvador for Messicobolidae Loomis, 1968 
Florida for Incobolus Chamberlin, 1955 
Guatemala for Allopocockiidae Keeton, 1960 
Guatemala for Messicobolidae Loomis, 1968 
Guatemala for Petenobolus Loomis, 1968 
Guatemala for Solaenogona Hoffman, 1950 
Honduras for Messicobolidae Loomis, 1968 
Illinois for Ethojulus Chamberlin, 1918 
Japan for Okeanobatidae Verhoeff, 1942 
Louisiana for Ethojulus Chamberlin, 1918 
Mexico for Messicobolidae Loomis, 1968 
Mississippi for Ethojulus Chamberlin, 1918 
Montana for Adritylidae Shear, 1971 
Montana for Conotyloidea Cook, 1896 
North Carolina for Cleidogona medialis Shelley, 1976 
North Carolina for Cleidogona medialis Shelley, 1976 
North Dakota for Archiboreoiulus pallidus (S. G. Brade-Birks, 1920) 
Northern America for Conotylidae Cook, 1896 
Ontario for Archiboreoiulus pallidus (S. G. Brade-Birks, 1920) 
Oregon for Conotyloidea Cook, 1896 
Texas for Ethojulus Chamberlin, 1918 
United States for Okeanobatidae Verhoeff, 1942 
Utah for Adritylidae Shear, 1971 
Utah for Conotyloidea Cook, 1896 
Virginia for Cleidogona medialis Shelley, 1976 
Virginia for Zosteractinidae Loomis, 1943 
Washington for Conotyloidea Cook, 1896 
Wyoming for Adritylidae Shear, 1971 
Wyoming for Conotyloidea Cook, 1896 

 Additional information

 for Californiulus vicinus Chamberlin, 1943

This name was erroneously left out of the checklist in Hoffman 1999 [details]

 Spelling

 for Rhiscosomides malcolmi Shear, 1973

This species was incorrectly spelled as "malcomi" in Hoffman, 1999, an error. [details]

 Status

 for Spirobolinus luciae Silvestri, 1898

Species not yet transferred to genus Spirobolellus. Synonymy of Spirobolinus with Spirobolellus proposed by Hoffman ... [details]

 Status

 for Spirobolinus nigritulus Silvestri, 1898

Species not yet transferred to genus Spirobolellus. Synonymy of Spirobolinus with Spirobolellus proposed by Hoffman ... [details]

 Status

 for Tylobolus viduus Chamberlin, 1940

Hoffman 1999 states: "The missing type specimen was collected at the same time and same place by the same collector ... [details]

 Taxonomic remark

 for Atopetholus paroicus Chamberlin, 1941

Hoffman (1999) lists this species as Atopetholinae of uncertain generic position. [details]