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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.


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).
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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)
However, also the brackish-water oligochaete Potamothrix bavaricus was repeatedly found here; the ostracod Cyprideis torosa and the calanoid Centropages sp.
The spermatozoon of Eudrilus eugeniae (Oligochaeta: Annelida): the first record of an endonuclear canal in Oligochaete spermatozoa.
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).
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.
Oligochaete taxa were grouped, and voltinism was uncertain; thus production was estimated using a P/B value of 5.
This study is designed to understand the genetic architecture of resistance to metal in a metal-tolerant aquatic oligochaete.
Benthic communities are usually dominated by different species of polychaete, oligochaete worms, gastropods, bivalvia and various minor insect larvae.
Oligochaete assemblages in the hyporheic zone and coarse surface sediments: their importance for understanding of ecological functioning of watercourses.