Lumbriculus multiatriatus
Encyclopedia
Lumbriculus multiatriatus was described by Yamaguchi in 1937 from several specimens from Sakhalin
Sakhalin
Sakhalin or Saghalien, is a large island in the North Pacific, lying between 45°50' and 54°24' N.It is part of Russia, and is Russia's largest island, and is administered as part of Sakhalin Oblast...

 and Hokkaidō
Hokkaido
, formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan's second largest island; it is also the largest and northernmost of Japan's 47 prefectural-level subdivisions. The Tsugaru Strait separates Hokkaido from Honshu, although the two islands are connected by the underwater railway Seikan Tunnel...

. As the name suggests, it is distinguished from other Lumbriculus
Lumbriculus
Lumbriculus is a genus of oligochaetes....

species by having four atria, as opposed to the one or two that is standard from the genus.
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