Juget 1987. Contribution to the study of the Rhyacodrilinae (Tubificidae, Oligochaeta) with description of two new stygobiont species from the alluvial plain of the French upper Rhone, Rhyacodrilus amphigenus., sp. n. and Rhizodriloides phreaticola, g. n., sp. n. Hydrobiologia, 155 1987: 107-118