• Amphichaeta leydigii Tauber, 1879: first-order opportunistic
• Amphichaeta sannio Kallstenius, 1892: first-order opportunistic
• Baltidrilus costatus (Claparède, 1863): first-order opportunistic
• Branchiocapitella abranchiata Hartmann-Schröder, 1962: first-order opportunistic
• Capitella capitata (Fabricius, 1780): first-order opportunistic
• Capitella giardi (Mesnil, 1897): first-order opportunistic
• Capitella jonesi (Hartman, 1959): first-order opportunistic
• Capitella minima Langerhans, 1880: first-order opportunistic
• Capitella perarmata (Gravier, 1911): first-order opportunistic
• Capitella singularis (Fauvel, 1932): first-order opportunistic
• Capitella teleta Blake, Grassle & Eckelbarger, 2009: first-order opportunistic
• Christerius litoralis (Erséus, 1976): first-order opportunistic
• Clitellio (Clitellio) arenarius (Müller, 1776): first-order opportunistic
• Duridrilus tardus Erséus, 1983: first-order opportunistic
• Enchytraeus albidus Henle, 1837: first-order opportunistic
• Grania ovitheca Erséus, 1977: first-order opportunistic
• Heteroclymene robusta Arwidsson, 1906: first-order opportunistic
• Jassa falcata (Montagu, 1808): first-order opportunistic
• Jassa marmorata Holmes, 1905: first-order opportunistic
• Jassa pusilla (G.O. Sars, 1894): first-order opportunistic
• Leiocapitella dollfusi (Fauvel, 1936): first-order opportunistic
• Limnodrilus cervix Brinkhurst, 1963: first-order opportunistic
• Limnodrilus claparedianus Ratzel, 1868: first-order opportunistic
• Limnodrilus hoffmeisteri Claparède, 1862: first-order opportunistic
• Limnodrilus udekemianus Claparède, 1862: first-order opportunistic
• Lumbriculus variegatus (Müller, 1774): first-order opportunistic
• Malacoceros fuliginosus (Claparède, 1868): first-order opportunistic
• Malacoceros vulgaris (Johnston, 1827): first-order opportunistic
• Maldanella capensis Day, 1961: first-order opportunistic
• Maldanella fibrillata Chamberlin, 1919: first-order opportunistic
• Maldanella robusta Moore, 1906: first-order opportunistic
• Marionina argentea (Michaelsen, 1889): first-order opportunistic
• Mastobranchus trinchesii Eisig, 1887: first-order opportunistic
• Mastobranchus variabilis Ewing, 1984: first-order opportunistic
• Meiodorvillea chilensis (Hartmann-Schröder, 1965): first-order opportunistic
• Monopylephorus irroratus (Verrill, 1873): first-order opportunistic
• Monopylephorus rubroniveus Levinsen, 1884: first-order opportunistic
• Nebalia bipes (Fabricius, 1780): first-order opportunistic
• Nebalia herbstii Leach, 1814: first-order opportunistic
• Nebalia reboredae Moreira & Urgorri, 2009: first-order opportunistic
• Nebalia strausi Risso, 1827: first-order opportunistic
• Nebalia troncosoi Moreira, Cacabelos & Dominguez, 2003: first-order opportunistic
• Notomastus mossambicus (Thomassin, 1970): first-order opportunistic
• Paranais frici Hrabĕ, 1941: first-order opportunistic
• Paranais litoralis (Müller, 1784): first-order opportunistic
• Parheteromastus tenuis Monro, 1937: first-order opportunistic
• Potamocorbula amurensis (Schrenck, 1861): first-order opportunistic
• Potamocorbula laevis (Hinds, 1843): first-order opportunistic
• Pseudocapitella incerta Fauvel, 1913: first-order opportunistic
• Pseudoleiocapitella fauveli Harmelin, 1964: first-order opportunistic
• Sabatieria punctata (Kreis, 1924): first-order opportunistic
• Schistomeringos annulata (Moore, 1906): first-order opportunistic
• Schistomeringos longicornis (Ehlers, 1901): first-order opportunistic
• Scyphoproctus djiboutiensis Gravier, 1904: first-order opportunistic
• Sphaeroma serratum (J. C. Fabricius, 1787): maximum
• Stylaria lacustris (Linnaeus, 1758): first-order opportunistic
• Torodrilus lowryi Cook, 1970: first-order opportunistic
• Tubifex nerthus Michaelsen, 1908: first-order opportunistic
• Tubifex tubifex (Müller, 1774): first-order opportunistic
• Tubificoides amplivasatus (Erséus, 1975): first-order opportunistic
• Tubificoides benedii (d'Udekem, 1855): first-order opportunistic
• Tubificoides brownae Brinkhurst & Baker, 1979: first-order opportunistic
• Tubificoides crenacoleus Baker, 1983: first-order opportunistic
• Tubificoides fraseri Brinkhurst, 1986: first-order opportunistic
• Tubificoides galiciensis Martinez-Ansemil & Giani, 1987: first-order opportunistic
• Tubificoides heterochaetus (Michaelsen, 1926): first-order opportunistic
• Tubificoides insularis (Stephenson, 1922): first-order opportunistic
• Tubificoides pseudogaster (Dahl, 1960): first-order opportunistic
• Tubificoides swirencoides Brinkhurst, 1985: first-order opportunistic
• Tubificoides vestibulatus Erséus & Bonomi, 1987: first-order opportunistic
• Tubificoides wasselli Brinkhurst & Baker, 1979: first-order opportunistic
• Uncinais uncinata (Ørsted, 1842): first-order opportunistic