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The annelids (/ ˈ æ n ə l ɪ d z /), also known as the segmented worms, comprise a large phylum called Annelida (/ ə ˈ n ɛ l ɪ d ə /; from Latin anellus 'little ring'). [ 3 ] [ a ] The phylum contains over 22,000 extant species , including ragworms , earthworms , and leeches .
For much of the year, these worms look like any other burrow-dwelling polychaete, but as the breeding season approaches, the worm undergoes a remarkable transformation as new, specialized segments begin to grow from its rear end until the worm can be clearly divided into two halves. The front half, the atoke, is asexual.
Limnodrilus hoffmeisteri is a segmented oligochaete worm with tapering end and typical body length of 25–40 mm. It has a simple conical shaped head without eyespots and a long cylindrical body with 55-95 segments. Each of segments can regenerate into a new individual when separated from the worm body.
Leeches are segmented parasitic or predatory worms that comprise the subclass Hirudinea within the phylum Annelida.They are closely related to the oligochaetes, which include the earthworm, and like them have soft, muscular segmented bodies that can lengthen and contract.
Oligochaetes are well-segmented worms and most have a spacious body cavity (coelom) used as a hydroskeleton.They range in length from less than 0.5 mm (0.02 in) up to 2 to 3 metres (6.6 to 9.8 ft) in the 'giant' species such as the giant Gippsland earthworm (Megascolides australis) and the Mekong worm (Amynthas mekongianus).
Tubifex, in Aa River (north of France) in a polluted zone, circa 1990. Tubifex tubifex, also called the sludge worm or sewage worm, is a species of tubificid segmented worm which inhabits the sediments of lakes and rivers on several continents.
parasitic worm: ranges from a few millimeters up to 65 centimetres (26 in) Annelida: phylum: segmented worms: ranges from microscopic to 3 metres (9.8 ft) Aplacophora: Sub-phylum: molluscs that look like worms: a few millimeters to several centimeters Chaetognatha: phylum: arrow worms: 2 to 120 millimetres (0.079 to 4.724 in) Cycliophora: phylum
An example of a marine worm, the Parborlasia corrugatus lives at depths of up to 4,000 metres.. Any worm that lives in a marine environment is considered a water worm. Marine worms are found in several different phyla, including the Platyhelminthes, Nematoda, Annelida (segmented worms), Chaetognatha, Hemichordata, and Phoronida.