Lumbriculus japonicus
| Lumbriculus variegatus | |
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| Species: | L. japonicus
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| Lumbriculus japonicus | |
Lumbriculus japonicus was described by Yamaguchi in 1936 from locations on Hokkaido. It is distinguished from other species mainly by the location of the genital elements, which are positioned two segments posteriorly to their position in Lumbriculus variegatus.