Haplotaxida

Haplotaxida
Lumbricus terrestris, the Common European Earthworm
Scientific classification
Kingdom:	Animalia
Phylum:	Annelida
Class:	Clitellata
Subclass:	Oligochaeta
Order:	Haplotaxida
Families
Suborder Haplotaxina   Haplotaxidae Suborder Moniligastrina   Moniligastridae Suborder Lumbricina   Alluroididae   Eudrilidae   Glossoscolecidae   Lumbricidae   Hormogastridae   Ailoscolidae   Lutodrilidae   Sparganophilidae   Criodrilidae   Ocnerodrilidae   Acanthodrilidae   Octochaetidae   Exxidae   Megascolecidae   Microchaetidae   Eudrilidae Suborder Tubificina   Dorydrilidae   Enchytraeidae   Naididae (including Tubificidae)   Opistocystidae   Phreodrilidae

The Haplotaxida is one of two orders within the subclass oligochaeta, the other being the lumbriculida it is also related with the earthworm. Haplotaxida contains such animals which are invertebrates such an earthworms or aquaworms