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Rhynchelmis
''Rhynchelmis'' is the genus of 30 species of aquatic oligochaetes from the Northern Hemisphere, with 11 species from North America and 19 from Eurasia. They are part of the family Lumbriculidae, which are among the largest of the microdriles. They are generally defined as having atria in segment X and spermathecae in segment VIII (Fend & Brinkhurst, 2000). The prostomium generally has a proboscis, from which the genus has got its name. ''Rhynchelmis'' contains several subgenera, all of which have previously held genus rank: ''Rhynchelmoides'' with four species, ''Sutroa'' with six species, and ''Pseudorhynchelmis'' with nine species. Further, four species - ''Rh. aleutensis'', ''Rh. brooksi'', ''Rh. malevici'' and ''Rh. orientalis'' - cannot positively be placed in any of the subgenera. ==References==
* Fend, S. V. & Brinkhurst, R. O. (2000): New species of ''Rhynchelmis'' (Clitellata, Lumbriculidae), with observations on the Nearctic species. ''Hydrobiologia'' 428: 1-59.
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