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  Animalia
      Annelida
            Clitellata
              Oligochaeta
                    Haplotaxida
                      Tubificina
                            Tubificidae
                                     Adelodrilus
                                             Adelodrilus anisosetosus
                                             Adelodrilus cooki
                                             Adelodrilus cristatus
                                             Adelodrilus fimbriatus
                                             Adelodrilus inopinatus
                                             Adelodrilus multispinosus
                                             Adelodrilus pusillus
                                             Adelodrilus voraginus
                                     Antipodrilus
                                             Antipodrilus dividis
                                                   [Tubifex davidis]
                                     Arctodrilus
                                             Arctodrilus wulikensis
                                     Aulodrilus
                                             Aulodrilus americanus
                                             Aulodrilus limnobius
                                             Aulodrilus paucichaeta
                                             Aulodrilus pigueti
                                                   [Aulodrilus stephensoni]
                                             Aulodrilus pluriseta
                                                   [Naidium pluriseta]
                                     Bathydrilus
                                             Bathydrilus adriaticus
                                             Bathydrilus asymmetricus
                                             Bathydrilus atlanticus
                                             Bathydrilus ingens
                                             Bathydrilus longus
                                             Bathydrilus rarisetis
                                             Bathydrilus sandersi
                                     Bothrioneuron
                                             Bothrioneuron iris
                                             Bothrioneuron veejdovskyanum
                                     Bothrioneurum
                                             Bothrioneurum vejdovskyanum
                                     Branchiura
                                             Branchiura sowerbyi
                                     Clitellio
                                             Clitellio arenarius
                                                   [Lumbricus arenarius]
                                             Clitellio arenicolus
                                                   [Heterodrilus arenicolus]
                                     Epirodrilus
                                             Epirodrilus michaelseni
                                     Haber
                                             Haber speciosus
                                     Heterochaeta
                                             Heterochaeta costata
                                                   [Tubifex costatus]
                                     Heterodrilus
                                             Heterodrilus keenani
                                             Heterodrilus occidentalis
                                     Ilyodrilus
                                             Ilyodrilus asiaticus
                                             Ilyodrilus coccineus
                                             Ilyodrilus frantzi
                                               Ilyodrilus frantzi capillatus
                                               Ilyodrilus frantzi frantzi
                                             Ilyodrilus mastix
                                             Ilyodrilus montana
                                             Ilyodrilus perrieri
                                             Ilyodrilus sodalis
                                             Ilyodrilus templetoni
                                                   [Tubifex templetoni]
                                     Inanidrilus
                                             Inanidrilus bulbosus
                                             Inanidrilus leukodermatus
                                             Inanidrilus mexicanus
                                     Isochaeta
                                             Isochaeta hamata
                                                   [Tubifex hamatus]
                                             Isochaeta nevadana
                                             Isochaeta ovalis
                                             Isochaeta virulenta
                                     Isochaetides
                                             Isochaetides columbiensis
                                             Isochaetides curvisetosus
                                             Isochaetides freyi
                                     Jolydrilus
                                             Jolydrilus jaulus
                                     Limnodriloides
                                             Limnodriloides agnes
                                             Limnodriloides appendiculatus
                                             Limnodriloides barnardi
                                             Limnodriloides medioporus
                                             Limnodriloides monothecus
                                             Limnodriloides rubicundus
                                             Limnodriloides scandinavicus
                                             Limnodriloides victoriensis
                                     Limnodrilus
                                             Limnodrilus angustipenis
                                             Limnodrilus cervix
                                             Limnodrilus claparedianus
                                             Limnodrilus hoffmeisteri
                                                   [Camptodrilus californicus]
                                                   [Limnodrilus aurantiacus]
                                               Limnodrilus hoffmeisteri hoffmeisteri
                                               Limnodrilus hoffmeisteri spiralis
                                             Limnodrilus maumeensis
                                             Limnodrilus profundicola
                                                   [Tubifex helveticus]
                                                   [Tubifex profundicola]
                                             Limnodrilus psamnophilus
                                             Limnodrilus rubripenis
                                             Limnodrilus silvani
                                             Limnodrilus tortilipenis
                                             Limnodrilus udekemianus
                                                   [Limnodrilus ornatus]
                                                   [Limnodrilus steigerwaldi]
                                                   [Limnodrilus willeyi]
                                             Limnodrilus variatus
                                     Macquaridrilus
                                             Macquaridrilus benettae
                                     Marcusaedrilus
                                             Marcusaedrilus capricornae
                                     Monopylephorus
                                             Monopylephorus frigidus
                                             Monopylephorus helobius
                                             Monopylephorus irroratus
                                                   [Clitellio irrorata]
                                             Monopylephorus lacteus
                                             Monopylephorus parvus
                                             Monopylephorus rubroniveus
                                     Olavius
                                             Olavius alius
                                     Paranadrilus
                                             Paranadrilus descolei
                                     Peloscolex
                                             Peloscolex aculeatus
                                             Peloscolex apectinatus
                                                   [Peloscolex gabriellae apectinata]
                                             Peloscolex beetoni
                                             Peloscolex benedeni
                                                   [Tubifex benedeni]
                                                   [Tubificoides benedeni]
                                             Peloscolex carolinensis
                                             Peloscolex dukei
                                             Peloscolex ferox
                                                   [Spirosperma ferox]
                                             Peloscolex freyi
                                             Peloscolex gabriellae
                                                   [Tubificoides gabriellae]
                                             Peloscolex heterochaetus
                                                   [Limnodrilus heterochaetus]
                                                   [Tubificoides heterochaetus]
                                                   [Tubificoides swirencowi]
                                             Peloscolex methoides
                                                   [Peloscolex gabriellae merthoides]
                                             Peloscolex multisetosus
                                                   [Embolocephalus multisetosus]
                                               Peloscolex multisetosus longidentus
                                               Peloscolex multisetosus multisetosus
                                               Peloscolex multisetosus typica
                                             Peloscolex oregonensis
                                                   [Peloscolex insularis]
                                             Peloscolex superiorensis
                                             Peloscolex variegatus
                                     Peosidrilus
                                             Peosidrilus biprostatus
                                     Phallodrilus
                                             Phallodrilus aquaedulcis
                                             Phallodrilus biparis
                                             Phallodrilus coeloprostatus
                                             Phallodrilus curisetosus
                                             Phallodrilus freyi
                                             Phallodrilus grasslei
                                             Phallodrilus hallae
                                             Phallodrilus monospermathecus
                                             Phallodrilus obscurus
                                             Phallodrilus parthenopaeus
                                             Phallodrilus parviatriatus
                                             Phallodrilus profundus
                                             Phallodrilus tenuissimus
                                     Pontodrilus
                                             Pontodrilus bermudensis
                                     Potamothrix
                                             Potamothrix bavaricus
                                                   [Tubifex bavaricus]
                                             Potamothrix bedoti
                                             Potamothrix hammoniensis
                                             Potamothrix moldaviensis
                                             Potamothrix vejdovskyi
                                     Psammoryctides
                                             Psammoryctides barbatus
                                                   [Saenuris barbata]
                                             Psammoryctides californianus
                                             Psammoryctides convolutus
                                             Psammoryctides curvisetosus
                                     Quistradrilus
                                             Quistradrilus multisetosus
                                     Rhizodrilus
                                             Rhizodrilus lacteus
                                     Rhyacodrilis
                                             Rhyacodrilis brevidentatus
                                             Rhyacodrilis coccineus
                                             Rhyacodrilis falciformis
                                             Rhyacodrilis minutus
                                             Rhyacodrilis montana
                                             Rhyacodrilis ontarionis
                                             Rhyacodrilis punctatus
                                             Rhyacodrilis sodalis
                                     Rhyacodrilus
                                             Rhyacodrilus brevidentatus
                                             Rhyacodrilus coccineus
                                                   [Tubifex coccineus]
                                             Rhyacodrilus falciformis
                                             Rhyacodrilus montanus
                                                   [Edmondsonia montana]
                                             Rhyacodrilus riabuschinskii
                                             Rhyacodrilus sodalis
                                                   [Illyodrilus sodalis]
                                     Siolidrilus
                                             Siolidrilus adetus
                                     Smithsonidrilus
                                             Smithsonidrilus marinus
                                     Spiridion
                                             Spiridion insigne
                                             Spiridion modricensis
                                             Spiridion scrobiculare
                                     Spirosperma
                                             Spirosperma beetoni
                                             Spirosperma carolinensis
                                             Spirosperma nikolskyi
                                     Tectidrilus
                                             Tectidrilus diversus
                                     Telmatodrilus
                                             Telmatodrilus onegensis
                                             Telmatodrilus vejdovskyi
                                     Teneridrilus
                                             Teneridrilus mastix
                                     Thalassodrilus
                                             Thalassodrilus firmus
                                             Thalassodrilus klarae
                                             Thalassodrilus prostratus
                                                   [Rhyacodrilus prostrata]
                                     Trasserkidrilus
                                             Trasserkidrilus harmani
                                                   [Tubifex harmani]
                                             Trasserkidrilus kessleri
                                                   [Tubifex kessleri]
                                               Trasserkidrilus kessleri americanus
                                                     [Tubifex kessleri americanus]
                                               Trasserkidrilus kessleri kessleri
                                                     [Tubifex kessleri kessleri]
                                             Trasserkidrilus superiorensis
                                                   [Tubifex superiorensis]
                                     Tubifex
                                             Tubifex ignotus
                                                   [Lophochaeta ignota]
                                             Tubifex longipenis
                                             Tubifex nerthus
                                             Tubifex newaensis
                                                   [Limnodrilus newaensis]
                                             Tubifex newfei
                                             Tubifex tubifex
                                                   [Lumbricus tubifex]
                                     Tubificoides
                                             Tubificoides aculeatus
                                             Tubificoides amplivasatus
                                             Tubificoides apectinatus
                                             Tubificoides bakeri
                                             Tubificoides benedii
                                             Tubificoides brownae
                                             Tubificoides crenacoleus
                                             Tubificoides cuspisetosus
                                             Tubificoides diazi
                                             Tubificoides insularis
                                             Tubificoides intermedius
                                                   [Peloscolex intermedius]
                                             Tubificoides kozloffi
                                             Tubificoides maureri
                                             Tubificoides pseudogaster
                                                   [Isochaetides pseudogaster]
                                                   [Limnodrilus pseudogaster]
                                                   [Tubifex alpinus]
                                                   [Tubifex pseudogaster]
                                             Tubificoides scoticus
                                             Tubificoides swirencoides
                                             Tubificoides wasselli
                                     Uniporodrilus
                                             Uniporodrilus granulothecus
                                     Varichaetadrilus
                                             Varichaetadrilus fulleri
                                             Varichaetadrilus minutus
                                             Varichaetadrilus nevadana
                                             Varichaetadrilus pacificus
                                             Varichaetadrilus psammophilus