Achaeta incisa Friend, 1913 (status source)
Aegialina sigma Friend, 1916 (status source)
Allolobophora cambrica Friend, 1892 accepted as Allolobophora chlorotica (Savigny in Cuvier, 1826) (source of synonymy)
Allolobophora veneta robusta Friend, 1909 accepted as Allolobophora hibernica Friend, 1892 accepted as Allolobophora veneta Rosa, 1886 accepted as Dendrobaena veneta (Rosa, 1886) (source of synonymy)
Allolobophora veneta tepidaria Friend, 1904 accepted as Eisenia veneta hortensis (Michaelsen, 1890) (source of synonymy)
Allurus mollis Friend, 1913 accepted as Eiseniella tetraedra (Savigny in Cuvier, 1826) (additional source)
Allurus tetraedrus luteus Friend, 1892 accepted as Eiseniella tetraedra (Savigny in Cuvier, 1826) (source of synonymy)
Allurus tetragonurus Friend, 1892 accepted as Eiseniella tetraedra (Savigny in Cuvier, 1826) (source of synonymy)
Anagaster fontinalis Friend, 1921 accepted as Helodrilus oculatus Hoffmeister, 1845 (status source)
Dendrobaena arborea pygmea Friend, 1923 (status source)
Dendrobaena merciensis Friend, 1911 accepted as Bimastos eiseni (Levinsen, 1884) (source of synonymy)
Dero olearia Friend, 1912 (status source)
Dichogaster lageniformis Friend, 1916 accepted as Dichogaster bolaui (Michaelsen, 1891) represented as Dichogaster (Diplothecodrilus) bolaui (Michaelsen, 1891) (basis of record)
Eisenia veneta carnea Friend, 1911 (basis of record)
Eisenia veneta tumida Friend, 1927 accepted as Eisenia veneta (Rosa, 1886) accepted as Dendrobaena veneta (Rosa, 1886) (source of synonymy)
Enchytraeus exiguus Friend, 1911 (status source)
Enchytraeus hyalinus densus Friend, 1912 (status source)
Fridericia anglica Friend, 1912 (status source)
Fridericia arborea Friend, 1914 (additional source)
Fridericia bulbifera Friend, 1914 accepted as Fridericia bulbosa (Rosa, 1887) (source of synonymy)
Fridericia clara Friend, 1913 accepted as Fridericia galba (Hoffmeister, 1843) (source of synonymy)
Fridericia coronata Friend, 1914 accepted as Fridericia hegemon (Vejdovský, 1878) (source of synonymy)
Fridericia hillmani Friend, 1913 accepted as Fridericia galba (Hoffmeister, 1843) (source of synonymy)
Fridericia inornata Friend, 1914 (status source)
Fridericia microcara Friend, 1912 (status source)
Fridericia nigrina Friend, 1913 (status source)
Fridericia obtusa Friend, 1913 (status source)
Fridericia peruviana Friend, 1911 (status source)
Fridericia pseudobulbifera Friend, 1912 accepted as Fridericia bulbifera Friend, 1914 accepted as Fridericia bulbosa (Rosa, 1887) (source of synonymy)
Fridericia pulchra Friend, 1911 accepted as Fridericia bulbosa (Rosa, 1887) (source of synonymy)
Fridericia reversa Friend, 1913 accepted as Fridericia galba (Hoffmeister, 1843) (additional source)
Fridericia rotunda Friend, 1913 accepted as Fridericia ratzeli (Eisen, 1872) (source of synonymy)
Fridericia ulmicola Friend, 1898 accepted as Fridericia galba (Hoffmeister, 1843) (status source)
Henlea alba Friend, 1913 (status source)
Henlea arenicola Friend, 1912 (status source)
Henlea dicksoni multispinus Friend, 1913 accepted as Henlea ventriculosa (d'Udekem, 1854) (source of synonymy)
Henlea glandulosa Friend, 1913 (status source)
Henlea heterotropa Friend, 1912 (status source)
Henlea insulae Friend, 1913 accepted as Fridericia callosa (Eisen, 1878) (source of synonymy)
Henlea mariona Friend, 1913 (status source)
Henlea minima Friend, 1913 accepted as Henlea perpusilla Friend, 1911 (source of synonymy)
Henlea pusilla Friend, 1913 (status source)
Henlea triloba Friend, 1912 (status source)
Henlea variata Friend, 1912 (status source)
Henlea variata polychaeta Friend, 1912 (status source)
Ilyodrilus glandulosus Friend, 1912 (status source)
Ilyodrilus meganymphus Friend, 1912 (status source)
Ilyodrilus pallescens Friend, 1912 (status source)
Kerria rubra Friend, 1916 (status source)
Limnodrilus aurantiacus Friend, 1911 accepted as Limnodrilus hoffmeisteri f. spiralis (Eisen, 1879) (additional source)
Limnodrilus galeritus Friend, 1912 (additional source)
Limnodrilus inaequidens Friend, 1912 (status source)
Limnodrilus nervosus Friend, 1912 (additional source)
Limnodrilus trisetosus Friend, 1912 (status source)
Limnodrilus wordsworthianus Friend, 1898 accepted as Limnodrilus udekemianus Claparède, 1862 (source of synonymy)
Mesenchytraeus oligosetosus Friend, 1913 accepted as Mesenchytraeus armatus (Levinsen, 1884) (additional source)
Octolasium intermedium Friend, 1909 accepted as Allolobophora longa Ude, 1885 accepted as Aporrectodea longa (Ude, 1885) (source of synonymy)
Rhyacodrilus bisetosus Friend, 1912 (status source)
Saenuris variabilis Friend, 1912 (status source)
Tubifex globulatus Friend, 1912 (status source)

 Nomenclature

 for Pristina variabilis Friend, 1916

As the species epithet variabilis was preoccupied by Nais variabilis Piguet 1906, Cernosvitov (1942) proposed the ... [details]