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(ŏl′ĭ-gō-kēt′, ō′lĭ-)
Any of various annelid worms of the class (or subclass) Oligochaeta, including the earthworms and aquatic species found chiefly in freshwater, which lack the appendages typical of polychaetes.

ol′i·go·chae′tous (-kē′təs) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


any ANNELID worm of the class Oligochaeta, including the earthworms. They occur mainly in nonacidic soils and in freshwater, and are distinguished from the other major order of CHAETOPODS, the POLYCHAETES, by a lack of PARAPODIA (projections from the body), few CHAETAE and lack of a well-developed head. Fertilization is internal (external in polychaetes).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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Recent studies (Gorni et al., 2015) recorded 75 species of aquatic oligochaetes in the State of Sao Paulo, in which 64 species (85%) belong to the Naididae family.
Dero (Allodero) hylae, an oligochaete symbiont in hylid frogs in Mississippi.
renale in maned wolves is related to the ingestion of water containing the oligochaete or to the ingestion of the paratenic host, a fish or an amphibian, containing the third-instar larva of D.
and Dallinger, R., 1999, "Mitochondrial DNA reveals cryptic oligochaete species differing in cadmium resistance," Molecular Biology and Evolution, 16, 967-974.
(1) Artificial diet with 45% Protein (LFd 1) (2) Rotifers like Asplanchna and Brachionus (LFd2) (3) Wild Zooplankton (LFd3) (4) Bioenriched zooplanktons (raised on Chlorella, cod liver oil and vitamin C) (LFd4) (5) Artemia (LFd5) (6) Chironomus (LFd6) (7) Oligochaetes (LFd7)
The bottom fauna consists exclusively of freshwater species, except for the single brackish-water oligochaete Potamothrix bavaricus common also in Suurlaht.
Spermatogenesis including spermiogenesis and the mature spermatozoon ultraestructure have been studied in several orders and oligochaete families (Jamieson et al., 1981; Anderson et al., 1967; Gluzman, 1999; Ferraguti, 1984).
This result indicates that no-till systems are meeting the objective of reducing the amount of fine sediments entering streams, since oligochaete worms and sphaeriid clams prefer conditions with large amounts of fine sediments (Thorpe and Covich, 2001).
For example, a resistant population of the oligochaete worm Limnodrilus hoffmeisteri was restricted to one cove of the Hudson River where unusually high levels of metals were detected in the sediments (Klerks and Levinton 1989).
Twenty-six species from various animal groups bear his name, including twelve spiders, four flies, a tardigrade and an oligochaete worm.
Eighty percent of the species are insects, and the other 20% comprise spiders, scorpions and mites, nematode, oligochaete and annelid worms, millipedes and centipedes, slugs, snails, freshwater bivalves, and crustaceans.
This study is designed to understand the genetic architecture of resistance to metal in a metal-tolerant aquatic oligochaete. Our results suggest the control by one gene, and further support the genetic simplicity and potential evolutionary responsiveness of metal tolerance in animals.