''Rhynchelmis orientalis'' is a freshwater worm. It was described by Yamaguchi in 1936 from specimens collected on

Hokkaidō is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

. It can be distinguished from other species in the genus by the very long spermathecae running in several posterior segments into spermsacs, disconnected to the alimentary tract, as well as a vestigial anterior vas deferens. The genital elements are positioned in a fashion similar to that of '' Rhynchelmis vejdovskyi''. ''Rhynchelmis orientalis'' is pinkish to purplish, of variable size. The number of segments is between 196 and 245, and the setae are one-pointed.

References

{{Taxonbar, from=Q7321678 Lumbriculidae Animals described in 1936