Haplotaxida

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Haplotaxida
Regenworm1.jpg
Helodrilus caliginosus (Lumbricina: Lumbricidae)
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
Phylum: Annelida
Class: Clitellata
Subclass: Oligochaeta (but see text)
Order: Haplotaxida
Suborders

Haplotaxina
Lumbricina
Moniligastrina
Tubificina

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 assemblege. 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 times and again in the past, most prominently for the distinct Moniligastrina.

Families[edit]

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

Suborder Haplotaxina

Suborder Moniligastrina

Suborder Lumbricina

Suborder Tubificina