Annelids

An earthworm is a soil-dwelling terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class (or subclass, depending on the author) Oligochaeta. In classical systems, they were in the order of Opisthopora since the male pores opened posterior to the female pores, although the internal male segments are anterior to the female. Theoretical cladistic studies have placed them in the suborder Lumbricina of the order Haplotaxida, but this may change. Other slang names for earthworms include "dew-worm", "rainworm", "nightcrawler", and

The annelids (), also known as the segmented worms, are animals that comprise the phylum Annelida (; ). The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments.

thumb|right|120px|Echiurus

Oligochaeta is a subclass of soft-bodied animals in the phylum Annelida, which is made up of many types of aquatic and terrestrial worms, including all of the various earthworms. Specifically, oligochaetes comprise the terrestrial megadrile earthworms (some of which are semiaquatic or fully aquatic), and freshwater or semiterrestrial microdrile forms, including the tubificids, pot worms and ice worms (Enchytraeidae), blackworms (Lumbriculidae) and several interstitial marine worms.

Sedentaria is a diverse clade of annelid worms. It is traditionally treated as a subclass of the paraphyletic class Polychaeta, but it is also a monophyletic group uniting several polychaetes and the monophyletic class Clitellata. It is the sister group of Errantia.''''''

species of invertebrate in the Eunicidae family

Scientific book about earthworms by Charles Darwin, 1881

methods of attracting earthworms from the ground

Crassiclitellata is an order of annelids belonging to the class Clitellata.

Branchiobdellidae is the singular family of annelids belonging to the monotypic order Branchiobdellida.

Magelonidae is a family of annelid worms in Palaeoannelida.

Abarenicola is a genus of polychaetes belonging to the family Arenicolidae.

Polygordiidae is a family of polychaetes belonging to the class Polychaeta, order unknown.

Diurodrilus is a genus of tiny marine animals classified as orbiniid annelid worms. With a maximum length of 0.45 mm, it has an unusual morphology with many traits not found in other annelids, including a ventral creeping foot. Analyses of DNA have both refuted and supported placement within the annelids, with the unusual morphology perhaps due to evolutionary progenesis, in which organisms develop sexual maturity while retaining the larval traits of their ancestors.

Metaphire is a genus of annelids belonging to the family Megascolecidae. The species of this genus are found in south-eastern Asia.

Sabellidites is a genus of annelid from the Late Ediacaran and Early Cambrian periods. It is among the oldest annelid body fossils.

Histriobdellidae is a family of annelids belonging to the order Eunicida.

Marenzelleria is a genus of annelids belonging to the family Spionidae.

Scoloplos is a genus of annelids belonging to the family Orbiniidae.

Alluroididae is a family of annelids belonging to the order Haplotaxida.

species of annelid

Naineris is a genus of polychaete annelids belonging to the family Orbiniidae. It was first described by Henri Marie Ducrotay de Blainville in 1828. The type species is Nais quadricuspida Fabricius, 1780, currently accepted as Naineris quadricuspida (Fabricius, 1780). The genus has cosmopolitan distribution.

Henlea is a genus of annelids belonging to the family Enchytraeidae.

Acanthobdella is a genus of annelids belonging to the family Acanthobdellidae.

Dorydrilidae is a family of annelids belonging to the order Haplotaxida.

Marphysa is a genus of annelids belonging to the family Eunicidae.

Palola is a genus of polychaetes belonging to the family Eunicidae.

Alvinella is a genus of annelids belonging to the family Alvinellidae.

species of annelid

Salifidae is a family of annelids belonging to the order Arhynchobdellida. Like all leeches, salifids are hermaphrodites and most are very good swimmers. Salifids live in aerated streams in Africa, Asia, and some Pacific islands. They are macrophagous carnivores, rather than haematophagous (blood-sucking), and swallow their prey whole. Prey animals include mainly chironomid larvae. Salifids have pharyngeal stylets rather than the jaws or probosces present in other leeches.

Ficopomatus is a genus of annelids belonging to the family Serpulidae.

Marionina is a genus of annelids belonging to the family Enchytraeidae.

Dichogaster is a genus of annelids belonging to the family Acanthodrilidae.

Aberrantidae is a family of annelids belonging to the order Spionida.

Aonides is a genus of annelids belonging to the family Spionidae.

thumb | 220x124px | right | Cirratulus cirratus Cirratulus is a genus of annelids belonging to the family Cirratulidae.

Abyssidrilus is a genus of annelids belonging to the family Naididae.

Monopylephorus is a genus of annelids belonging to the family Naididae.

Eupolymnia is a genus of annelids belonging to the family Terebellidae.

Eumida is a genus of polychaetes belonging to the family Phyllodocidae.

Microscolex is a genus of annelids belonging to the family Acanthodrilidae. The genus has cosmopolitan distribution.

genus of annelids

Gianius is a genus of annelids belonging to the family Naididae.

Sagitella is a genus of annelids belonging to the family Typhloscolecidae.

Enchytraeida is an order of annelids belonging to the class Clitellata.

Manayunkia is a genus of annelids belonging to the family Fabriciidae.

Euphione is a genus of polychaetes belonging to the family Polynoidae.

Xironogiton is a genus of annelids belonging to the family Branchiobdellidae.

Phragmatopoma is a genus of polychaetes belonging to the family Sabellariidae.

Cambarincola is a genus of annelids belonging to the family Branchiobdellidae.

Aktedrilus is a genus of annelids belonging to the family Naididae.

species of annelid

Heronidrilus is a genus of annelids belonging to the family Naididae, first described by Christer Erséus and Barrie Jamieson in 1981.

Uncinais is a genus of annelids belonging to the family Naididae.

Exallopus is a genus of polychaetes belonging to the family Dorvilleidae.

Cernosvitoviella is a genus of annelids belonging to the family Enchytraeidae.

Ocnerodrilidae is a family of annelids belonging to the order Haplotaxida.

thumb|right|An Ordovician scolecodont from Estonia

Varichaetadrilus is a genus of annelids belonging to the family Naididae.

Heteromastus is a genus of annelids belonging to the family Capitellidae.