A literature revision of Pararhyacodrilus Snimščikova, 1986, with the erection of a new genus, Semernodrilus gen. nov. (Oligochaeta, Tubificidae, Rhyacodrilinae) Timm, Tarmo Zootaxa 2020 2020-06-03 4786 3 431 436 Snimscikova 1986 [198,410,1269,1296] Clitellata Naididae Pararhyacodrilus GBIF,CoL Animalia Haplotaxida 2 433 Annelida genus  Proceeding from the above discussion, the connection between the spermathecae and the intestine is the only di- agnostic character separating the genus  Pararhyacodrilusfrom  Rhyacodrilus. This character is furthermore unique in Tubificidaewith hair chaetae [ Tubificidaehere in the traditional understanding; in the classification of Erséus et al.(2008)and followers, these would be equivalent to all subfamilies of Naididaeexcept Naidinaeand Pris- tininae]. The only two valid species corresponding to the diagnosis of this genus are  Pararhyacodrilus aspersus Snimščikova, 1986( typespecies, in Lake Baikal) and  P. ekmani( Piguet, 1928)(syn.  Rhyacodrilus ekmani, in Lake Vättern, Sweden). Two more taxa associated with  Pararhyacodrilusin the literature, i. e.  Rhyacodrilus palustris( Ditlevsen, 1904)(syn.  Ilyodrilus palustris) and  Rhyacodrilus profundalis Lastočkin, 1937(syn.  Rhyacodrilus ekmanivar. profundalis), do not belong to this genus, as has been shown above. As to  Pararhyacodrilus confusus, see below.