Lumbricus | oligochaete genus | Britannica (original) (raw)

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annotated classification

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  In annelid: Annotated classification
  Eisenia, Lumbricus (earthworm), Megascolides. Order Moniligastrida Male gonopores, 1 or 2 pairs on segment posterior to testes; clitellum 1 cell thick; 4 pairs of setae per segment; size, minute to 3 m; examples of genera: Moniligaster, Drawida.
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characteristics of earthworms

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  In earthworm
  …particular, members of the genus Lumbricus. Seventeen native species and 13 introduced species (from Europe) occur in the eastern United States, L. terrestris being the most common. Earthworms occur in virtually all soils of the world in which the moisture and organic content are sufficient to sustain them. One of…
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