• Abderos minotaurus Schüller & Jirkov, 2013
• Aciculaspio anaximanderi Blake & Ramey-Balci, 2020
• Acrocirrus aciculigerus Kudenov, 1976
• Acrocirrus bansei Magalhães & Bailey-Brock, 2012
• Acrocirrus columbianus Banse, 1979
• Acrocirrus crassifilis Moore, 1923
• Acrocirrus frontifilis (Grube, 1860)
• Acrocirrus heterochaetus Annenkova, 1934
• Acrocirrus heterochaetus okotensis Imajima, 1963 accepted as Acrocirrus okotensis Imajima, 1963
• Acrocirrus incisa Kudenov, 1975
• Acrocirrus leidyi Verrill, 1882 accepted as Macrochaeta leidyi (Verrill, 1882)
• Acrocirrus muroranensis Okuda, 1934
• Acrocirrus occipitalis Banse, 1979
• Acrocirrus okotensis Imajima, 1963
• Acrocirrus trisectus Banse, 1969
• Acrocirrus uchidai Okuda, 1934
• Acrocirrus validus Marenzeller, 1879
• Acromegalomma acrophthalmos (Grube, 1878)
• Acromegalomma adriaticum (Giangrande, Caruso, Mikac & Licciano, 2015)
• Acromegalomma bioculatum (Ehlers, 1887)
• Acromegalomma carunculatum (Tovar-Hernández & Salazar-Vallejo, 2008)
• Acromegalomma cinctum (Fitzhugh, 2003)
• Acromegalomma circumspectum (Moore, 1923)
• Acromegalomma claparedei (Gravier, 1906)
• Acromegalomma coloratum (Chamberlin, 1919)
• Acromegalomma fauchaldi (Giangrande, Licciano & Gambi, 2007)
• Acromegalomma georgiense (Tovar-Hernández & Carrera-Parra, 2011)
• Acromegalomma gesae (Knight-Jones, 1997)
• Acromegalomma heterops (Perkins, 1984)
• Acromegalomma inflatum (Capa & Murray, 2009)
• Acromegalomma interruptum (Capa & Murray, 2009)
• Acromegalomma jubatum (Capa & Murray, 2015)
• Acromegalomma kaikourense (Knight-Jones, 1997)
• Acromegalomma lanigerum (Grube, 1846)
• Acromegalomma lobiferum (Ehlers, 1887)
• Acromegalomma longoventrale (Giangrande, Caruso, Mikac & Licciano, 2015)
• Acromegalomma messapicum (Giangrande & Licciano, 2008)
• Acromegalomma miyukiae (Nishi, 1998)
• Acromegalomma modestum (Quatrefages, 1866)
• Acromegalomma multioculatum (Fitzhugh, 2002)
• Acromegalomma mushaense (Gravier, 1906)
• Acromegalomma nechamae (Knight-Jones, 1997)
• Acromegalomma pacifici (Grube, 1859)
• Acromegalomma perkinsi (Tovar-Hernández & Salazar-Vallejo, 2006)
• Acromegalomma phyllisae (Capa & Murray, 2009)
• Acromegalomma pigmentum (Reish, 1963)
• Acromegalomma pseudogesae (Mikac, Giangrande & Licciano, 2013)
• Acromegalomma quadrioculatum (Willey, 1905)
• Acromegalomma roulei (Gravier, 1908)
• Acromegalomma schwindtae Tovar-Hernández, de León-González & Bybee, 2017
• Acromegalomma splendidum (Moore, 1905)
• Acromegalomma sumbense Tovar-Hernández, ten Hove & de León-González in Tovar-Hernández et al, 2020
• Acromegalomma suspiciens (Ehlers, 1904)
• Acromegalomma trioculatum (Reish, 1968)
• Acromegalomma vesiculosum (Montagu, 1813)
• Actaedrilus polyonyx (Eliason, 1962)
• Actaedrilus yanbarensis Jimi, Fujimoto & Imura, 2020
• Adercodon pleijeli Mackie, 1994
• Alaysia spiralis Southward, 1991
• Alkmaria romijni Horst, 1919
• Alkmaria rominji [auct.] accepted as Alkmaria romijni Horst, 1919
• Alkmaria ryckiana (Augener, 1928) accepted as Alkmaria romijni Horst, 1919
• Alveolaria arenosa Leach in Johnston, 1865 accepted as Sabellaria alveolata (Linnaeus, 1767)
• Alveolaria lumbricalis Leach in Johnston, 1865 accepted as Sabellaria spinulosa (Leuckart, 1849)
• Alvinella caudata Desbruyères & Laubier, 1986
• Alvinella pompejana Desbruyères & Laubier, 1980
• Amaea accraensis Augener, 1918 accepted as Amaeana accraensis (Augener, 1918)
• Amaea antipoda Augener, 1926 accepted as Amaeana antipoda (Augener, 1926)
• Amaea colei McIntosh, 1926 accepted as Amaeana colei (McIntosh, 1926)
• Amaea occidentalis Hartman, 1944 accepted as Amaeana occidentalis (Hartman, 1944)
• Amaea trilobata (Sars, 1863) accepted as Amaeana trilobata (Sars, 1863)
• Amaeana accraensis (Augener, 1918)
• Amaeana angulus Nogueira, Carrerette & Hutchings, 2015
• Amaeana antipoda (Augener, 1926)
• Amaeana apheles (Hutchings, 1974)
• Amaeana brasiliensis Nogueira, Carrerette & Hutchings, 2015
• Amaeana breviachaeta Nogueira, Carrerette & Hutchings, 2015
• Amaeana colei (McIntosh, 1926) (uncertain > nomen dubium)
• Amaeana crassispinulata Nogueira, Carrerette & Hutchings, 2015
• Amaeana dampierensis Nogueira, Carrerette & Hutchings, 2015
• Amaeana ellobophora Nogueira, Carrerette & Hutchings, 2015
• Amaeana gremarei Lavesque, Hutchings, Daffe & Londoño-Mesa, 2020
• Amaeana hsiehae Nogueira, Carrerette & Hutchings, 2015
• Amaeana occidentalis (Hartman, 1944)
• Amaeana trilobata (Sars, 1863)
• Amaeana yirrarn Hutchings, 1997
• Amage adspersa (Grube, 1863)
• Amage anops (Johnson, 1901)
• Amage arieticornuta Moore, 1923
• Amage asiaticus Uschakov, 1955
• Amage auricula Malmgren, 1866
• Amage auricula sibogae Caullery, 1944
• Amage benhami Reuscher, Fiege & Wehe, 2009
• Amage corrugata (Fauchald, 1972)
• Amage delus (Chamberlin, 1919)
• Amage ehlersi Reuscher, Fiege & Imajima, 2015
• Amage gallasii Marion, 1875
• Amage gallasii Marion, 1876 accepted as Amage gallasii Marion, 1875
• Amage giacomobovei Schiaparelli & Jirkov, 2021
• Amage imajimai Reuscher, 2015