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.