Acanthodrilinae Claus, 1880 accepted as Acanthodrilidae Claus, 1880 (basis of record)
Acanthodrilus africanus Beddard, 1897 accepted as Chilota africanus (Beddard, 1897) (new combination reference)
Acanthodrilus capensis Beddard, 1885 accepted as Chilota capensis (Beddard, 1885) (new combination reference)
Acanthodrilus excavatus Beddard, 1897 accepted as Chilota excavatus (Beddard, 1897) accepted as Parachilota excavatus (Beddard, 1897) (new combination reference)
Acanthodrilus lucifuga Beddard, 1897 accepted as Chilota lucifuga (Beddard, 1897) accepted as Chilota lucifugus (Beddard, 1897) (new combination reference)
Acanthodrilus photodilus Beddard, 1897 accepted as Chilota photodilus (Beddard, 1897) accepted as Parachilota photodilus (Beddard, 1897) (new combination reference)
Acanthodrilus purcelli Beddard, 1897 accepted as Chilota purcelli (Beddard, 1897) (new combination reference)
Achaeta eisenii Vejdovský, 1878 accepted as Achaeta eiseni Vejdovský, 1878 (source of synonymy)
Aeolosoma beddardi Michaelsen, 1900 (original description)
Allolobophora cambrica Friend, 1892 accepted as Allolobophora chlorotica (Savigny in Cuvier, 1826) (source of synonymy)
Allolobophora dugesii Rosa, 1895 accepted as Allolobophora dugesi Rosa, 1895 accepted as Scherotheca (Scherotheca) dugesi (Rosa, 1895) (replacement name source)
Allolobophora lissaensis Michaelsen, 1891 accepted as Octolasium lissaense (Michaelsen, 1891) (new combination reference)
Alluroididae Michaelsen, 1900 (original description)
Anteus savanicola Michaelsen, 1900 accepted as Thamnodrilus savanicola (Michaelsen, 1900) (new combination reference)
Benhamia modiglianii Rosa, 1896 accepted as Dichogaster modiglianii (Rosa, 1896) represented as Dichogaster (Diplothecodrilus) modiglianii (Rosa, 1896) (new combination reference)
Bothrioneuron Stolč, 1886 accepted as Bothrioneurum Stolč, 1886 (source of synonymy)
Bothrioneurum Stolč, 1886 (replacement name source)
Brachydrilus benhami Michaelsen, 1900 accepted as Tritogenia benhami (Michaelsen, 1900) (original description)
Branchiodrilus Michaelsen, 1900 (original description)
Chaetodemus panduratus Leidy, 1852 accepted as Aeolosoma panduratum (Leidy, 1851) (status source)
Chaetogaster crystallinus Vejdovský, 1884 accepted as Chaetogaster cristallinus Vejdovský, 1884 (additional source)
Chilota patagonica (Kinberg, 1866) (status source)
Chirodrilus Smith & Verrill, 1871 accepted as Chirodrillus Smith & Verrill, 1871 (basis of record)
Chirodrilus abyssorum Verrill, 1871 accepted as Chirodrillus abyssorum Verrill, 1871 (basis of record)
Chirodrilus larviformis Verrill, 1871 accepted as Chirodrillus larviformis Verrill, 1871 (basis of record)
Claparedeilla Vejdovský, 1884 accepted as Claparedilla Vejdovský, 1884 accepted as Stylodrilus Claparède, 1862 (replacement name source)
Dero borellii Michaelsen, 1900 accepted as Aulophorus borellii (Michaelsen, 1900) (original description)
Dichogaster bolaui (Michaelsen, 1891) represented as Dichogaster (Diplothecodrilus) bolaui (Michaelsen, 1891) (basis of record)
Dichogaster bolaui (Michaelsen, 1891) represented as Dichogaster (Diplothecodrilus) bolaui (Michaelsen, 1891) (new combination reference)
Dichogaster modiglianii (Rosa, 1896) represented as Dichogaster (Diplothecodrilus) modiglianii (Rosa, 1896) (basis of record)
Diplocardiiinae Michaelsen, 1899 accepted as Acanthodrilidae Claus, 1880 (basis of record)
Diporochaeta Beddard, 1890 (taxonomy source)
Diporochaeta dilwynnia (Spencer, 1895) accepted as Perionychella (Vesiculodrilus) dilwynnia (Spencer, 1895) (basis of record)
Diporochaeta irregularis (Spencer, 1895) accepted as Perionychella (Perionychella) irregularis (Spencer, 1895) (basis of record)
Drawida Michaelsen, 1900 (original description)
Eiseniella Michaelsen, 1900 (original description)
Enchytraeus buchholzi Vejdovský, 1878 (source of synonymy)
Enchytraeus leydigii Vejdovský, 1878 accepted as Fridericia leydigi (Vejdovský, 1878) (new combination reference)
Enchytraeus triventralopectinatus Minor, 1863 accepted as Paranais litoralis (Müller, 1784) (source of synonymy)
Euaxes obtusirostris Menge, 1845 (status source)
Eudrilinae Claus, 1880 accepted as Eudrilidae Claus, 1880 (additional source)
Eupolygaster modiglianii (Rosa, 1896) (status source)
Eutyphoeus Michaelsen, 1900 (original description)
Eutyphoeus orientalis (Beddard, 1883) (new combination reference)
Glossoscolecidae Michaelsen, 1900 (original description)
Halodrilus littoralis Verrill, 1873 accepted as Enchytraeus albidus Henle, 1837 (source of synonymy)
Haplotaxidae Michaelsen, 1900 (original description)
Helodrilus (Allolobophora) jassyensis (Michaelsen, 1891) accepted as Aporrectodea jassyensis (Michaelsen, 1891) (basis of record)
Helodrilus (Allolobophora) longus (Ude, 1885) accepted as Aporrectodea longa (Ude, 1885) (basis of record)
Helodrilus (Dendrobaena) handlirschi (Rosa, 1897) accepted as Aporrectodea handlirschi (Rosa, 1897) (basis of record)
Helodrilus (Dendrobaena) rhenani (Bretscher, 1899) accepted as Aporrectodea handlirschi (Rosa, 1897) (basis of record)
Helodrilus (Eophila) ictericus (Savigny in Cuvier, 1826) accepted as Eophila icterica (Savigny in Cuvier, 1826) accepted as Aporrectodea icterica (Savigny in Cuvier, 1826) (new combination reference)
Helodrilus dugesi (Rosa, 1895) accepted as Scherotheca (Scherotheca) dugesi (Rosa, 1895) (basis of record)
Helodrilus leoni (Michaelsen, 1891) accepted as Allolobophora leoni Michaelsen, 1891 accepted as Allolobophora (Panoniona) Mrsic et Sapkarev, 1988 (basis of record)
Hesperoscolex Michaelsen, 1900 (original description)
Hesperoscolex barbadensis (Beddard, 1893) (basis of record)
Hesperoscolex columbianus (Michaelsen, 1900) (basis of record)
Hesperoscolex hesperidum (Beddard, 1893) (basis of record)
Hoplochaetella Michaelsen, 1900 (original description)
Hoplochaetella stuarti (Bourne, 1886) (new combination reference)
Hormogastridae Michaelsen, 1900 (original description)
Limnodrilus claparedeianus Michaelsen, 1900 accepted as Limnodrilus claparedianus Ratzel, 1868 (original description)
Lumbricus baicalensis Michaelsen, 1900 (additional source)
Lumbricus freyeri Ehrenberg, 1862 (status source)
Mandane litoralis Kinberg, 1866 accepted as Mandane patagonica Kinberg, 1866 accepted as Chilota patagonica (Kinberg, 1866) (taxonomy source)
Mandane patagonica Kinberg, 1866 accepted as Chilota patagonica (Kinberg, 1866) (taxonomy source)
Megascolecinae Rosa, 1891 accepted as Megascolecidae Rosa, 1891 (basis of record)
Megascolex (Perichaeta) sanctaehelenae Baird, 1871 (additional source)
Nais brumati Nardo, 1847 (status source)
Nais filiformis [auct. mistaken attribution to Williams, 1852] accepted as Tubifex tubifex (Müller, 1774) (status source)
Nais rigidula Nardo, 1847 (status source)
Nais variegata Schweigger, 1820 accepted as Lumbriculus variegatus (Müller, 1774) (source of synonymy)
Notiodrilus luisae Michaelsen, 1899 accepted as Microscolex luisae (Michaelsen, 1899) (new combination reference)
Ocnerodrilinae Beddard, 1891 accepted as Ocnerodrilidae Beddard, 1891 (basis of record)
Octochaetidae Michaelsen, 1900 (original description)
Octochaetinae Michaelsen, 1900 accepted as Octochaetidae Michaelsen, 1900 (original description)
Octochaetus aitkeni (Fedarb, 1898) (basis of record)
Octochaetus antarcticus (Beddard, 1889) (basis of record)
Octochaetus huttoni Beddard, 1893 (additional source)
Octochaetus levis (Hutton, 1877) (basis of record)
Octochaetus multiporus (Beddard, 1885) (basis of record)
Octolasium Michaelsen, 1900 accepted as Octolasion Örley, 1885 (original description)
Paranais litoralis (Müller, 1784) (taxonomy source)
Pleurophleps Vaillant, 1890 accepted as Pleurophlebs Vaillant, 1890 accepted as Aeolosoma Ehrenberg, 1828 (basis of record)
Polytoreutus silvestris Michaelsen, 1896 accepted as Polytoreutus kirimaensis Michaelsen, 1896 (additional source)
Pontoscolex hawaiensis Beddard, 1895 accepted as Pontoscolex corethrurus (Muller, 1856) (source of synonymy)
Pristina equiseta Bourne, 1891 accepted as Pristina aequiseta Bourne, 1891 represented as Pristina (Pristina) aequiseta Bourne, 1891 (taxonomy source)
Proto Ørsted, 1842 accepted as Dero Oken, 1815 (source of synonymy)
Rhinodrilus proboscideus Schneider, 1892 (status source)
Schmardaella Michaelsen, 1900 (original description)
Thamnodrilus tenkatei (Horst, 1887) accepted as Martiodrilus (Maipure) tenkatei (Horst, 1887) (additional source)
Trichochaeta barbadensis Beddard, 1893 accepted as Hesperoscolex barbadensis (Beddard, 1893) (new combination reference)
Trichochaeta columbiana Michaelsen, 1900 accepted as Hesperoscolex columbianus (Michaelsen, 1900) (new combination reference)
Trichochaeta hesperidum Beddard, 1893 accepted as Hesperoscolex hesperidum (Beddard, 1893) (new combination reference)
Trichodrilus inconstans (F. Smith, 1895) accepted as Thinodrilus inconstans F. Smith, 1895 accepted as Lumbriculus variegatus inconstans F. Smith, 1895 accepted as Lumbriculus inconstans (Smith, 1895) (basis of record)
Trigastrinae Michaelsen, 1900 accepted as Ocnerodrilidae Beddard, 1891 (original description)
Typhoeus Beddard, 1883 accepted as Eutyphoeus Michaelsen, 1900 (taxonomy source)
Xantho Dutrochet, 1819 accepted as Dero Oken, 1815 (source of synonymy)

Mato Grosso for Dero borellii Michaelsen, 1900 

 Classification

 for Hormogastridae Michaelsen, 1900

Originally created as as subfamily Hormogastrinae in family Glossoscolecidae for genus Hormogaster [details]

 Editor's comment

 for Megascolex (Perichaeta) sanctaehelenae Baird, 1871

Perichaeta is valid at genus-level, but it is apparently not known whether Baird's Megascolex (Perichaeta) ... [details]

 Etymology

 for Benhamia bolavi Michaelsen, 1891

As it was named after the collecter Mr. Bolau, it is unclear why Michaelsen named it bolavi. Michaelsen (1900:340) ... [details]

 Homonymy

 for Eutyphoeus Michaelsen, 1900

Michaelsen (1900) in a footnote states that Eutyphoeus is a replacement name for the junior homonym Typhaeus ... [details]

 Homonymy

 for Typhoeus Beddard, 1883

Although because of prevailing usage it would be difficult to revert to 'Typhoeus', which was the original genus ... [details]

 Nomenclature

 for Bothrioneurum Stolč, 1886

originally described by Stolc (1886) as Bothrioneuron but corrected by Michaelsen (1900) to Bothrioneurum Stolc [details]

 Nomenclature

 for Microchaeta Beddard, 1886

Originally as Microchaetus Rappe, 1849, later als Microcheta Perrier, 1881 and again as Microchaeta Beddard, 1886 [details]

 Spelling

 for Limnodrilus claparedeianus Michaelsen, 1900

Michaelsen (1900: 45) deliberately changed the original spelling of Ratzel's species name to 'claparedeianus', ... [details]

 Spelling

 for Typhaeus [auct. misspelling for 'Typhoeus']

Typhoeus Beddard (1883) was clearly spelled with an 'oe' ligature as subsequently correctly recorded as the ... [details]

 Type locality

 for Dero borellii Michaelsen, 1900

It was first insufficiently described by Cognettii (1900) as Dero sp. on the basis of material collected by A. ... [details]

 Type locality

 for Hesperodrilus albus Beddard, 1894

In Beddard's (1894) original paper he writes that the four new species of Hesperodrilus were from either Valdivia, ... [details]

 Type locality

 for Hesperodrilus branchiatus Beddard, 1894

In Beddard's (1894) original paper he writes that the four new species of Hesperodrilus were from either Valdivia, ... [details]

 Type locality

 for Hesperodrilus niger Beddard, 1894

In Beddard's (1894) original paper he writes that the four new species of Hesperodrilus were from either Valdivia, ... [details]

 Type locality

 for Hesperodrilus pellucidus Beddard, 1894

In Beddard's (1894) original paper he writes that the four new species of Hesperodrilus were from either Valdivia, ... [details]

 Type species

 for Diporochaeta Beddard, 1890

Beddard's first Perichaeta novaezelandiae was a nomen nudum, and it was not until his 1890 article creating ... [details]