Hrabea
| Lumbriculus variegatus | |
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| Species: | H. ogumai
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| Binomial name | |
| Hrabea ogumai | |
Hrabea ogumai was originally described by Yamaguchi in 1936 from specimens collected from subterranean waters in Sapporo. The genus is named after the great oligochaete specialist Dr. Segej Hrabe, and the species after Prof. K. Oguma.
Hrabea ogumai is similar to the Stylodrilus subgenus Bythonomus, but lacks the transversal vessels of the middle and posterior parts of the body, has one testes and male funnel (in segment X) instead of two (in segments IX and X), and has a pear-shaped atrium, to which the vas deferens is connected at the apical end, rather than at the lower half.
The body of Hrabea is 7-8 cm long, and consists of 146-183 segments. The bodywall is thin and transparent, but when illumintaed, shows a light green tint. It swims actively by lateral undulating movements. The setae are one-pointed.