Earthworm
Overview
Earthworm is the common name for the largest members of Oligochaeta
(which is either a class or subclass depending on the author) in the phylum Annelid
a. In classical systems they were placed in the order Opisthopora, on the basis of the male pores opening posterior to the female pores, even though the internal male segments are anterior to the female. Theoretical cladistic
studies have placed them instead in the suborder Lumbricina of the order Haplotaxida, but this may again soon change.
Oligochaeta
Oligochaeta is a subclass of animals in the biological phylum Annelida, which is made up of many types of aquatic and terrestrial worms, and this includes all of the various earthworms...
(which is either a class or subclass depending on the author) in the phylum Annelid
Annelid
The annelids , formally called Annelida , are a large phylum of segmented worms, with over 17,000 modern species including ragworms, earthworms and leeches...
a. In classical systems they were placed in the order Opisthopora, on the basis of the male pores opening posterior to the female pores, even though the internal male segments are anterior to the female. Theoretical cladistic
Cladistics
Cladistics is a method of classifying species of organisms into groups called clades, which consist of an ancestor organism and all its descendants . For example, birds, dinosaurs, crocodiles, and all descendants of their most recent common ancestor form a clade...
studies have placed them instead in the suborder Lumbricina of the order Haplotaxida, but this may again soon change.
