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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Annelida
Classis: Clitellata
Subclassis: Oligochaeta
Ordo: Haplotaxida
Subordines: Haplotaxina - Lumbricina - Moniligastrina - Tubificina -
Haplotaxida familiae Incertae sedis

Capilloventridae - Diporodrilidae - Hippoperidae - Kazimierzidae – Komarekionidae - Kurenkovidae - Lycodrilidae - Microchaetidae - Narapidae - Randiellidae - Tiguassidae
References

Nxele, T.C., Plisko, J.D., Mwabvu, T. & Zishiri, T.O. 2016. A new family Kazimierzidae for the genus Kazimierzus, earlier recorded to the composite Microchaetidae (Annelida, Oligochaeta). African Invertebrates 57(2): 111–117. DOI: 10.3897/AfrInvertebr.57.10042. Reference page.
Nxele, T.C., Plisko, J.D., Mwabvu, T. & Zishiri, O.T. 2017. Four new earthworm species of Kazimierzus Plisko, 2006 (Clitellata, Kazimierzidae). Zootaxa 4353(1): 187–194. DOI: 10.11646/zootaxa.4353.1.12. Reference page.

Vernacular names
English: Haplotaxids

The Haplotaxida are one of two orders within the annelid subclass Oligochaeta, the other being the Lumbriculida. No real common name exists, but they are simply referred to as haplotaxids.

Given that the other clitellatan annelids are embedded between and around the Haplotaxida and Lumbriculida, the traditional Oligochaeta are a paraphyletic assemblage. Thus, the Haplotaxida might eventually be up-ranked to subclass status within the Clitellata or an expanded Oligochaeta, with the present suborders advancing to order rank. The latter – though without merging the Oligochaeta and Clitellata – has been proposed time and again in the past, most prominently for the distinct Moniligastrina.
Families

Of the four suborders of Haplotaxida, two are minor lineages, monotypic at family level. Another one, the Tubificina, is sizeable and contains the aquatic worms, while the fourth, the earthworms or Lumbricina, unites the bulk of the order's families:

Suborder Haplotaxina

Haplotaxidae

Suborder Moniligastrina

Moniligastridae

Suborder Lumbricina

Alluroididae
Eudrilidae
Glossoscolecidae
Lumbricidae
Hormogastridae
Ailoscolidae
Lutodrilidae
Sparganophilidae
Criodrilidae
Ocnerodrilidae
Acanthodrilidae
Octochaetidae
Exxidae
Megascolecidae
Microchaetidae

Suborder Tubificina

Dorydrilidae
Enchytraeidae
Naididae (including Tubificidae)
Opistocystidae
Phreodrilidae

Biology Encyclopedia

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