title: Limnodrilus simplex sp. nov. (Oligochaeta: Naididae: Tubificinae) from Changjiang River, China.
abstract: Limnodrilus simplex sp. nov. (Oligochaeta: Naididae: Tubificinae) is described based on a single specimen from the mainstream of the Changjiang River near Anqing City, Anhui Province, China. The new species is assigned to Limnodrilus by the presence of long vasa deferentia, spindle-shaped atria with long ejaculatory ducts, large prostate glands, and thick cylindrical penial sheaths. It differs from its congeners in having simple-pointed chaetae and cuticularized penial sheaths without hoods. Limnodrilus simplex is closer to L. paramblysetus and L. amblysetus in possessing penial sheaths with relatively low length/maximum width ratio.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.
authors.forename: Xuebao
authors.initials: X
authors.lastname: He
authors.forename: Yongde
authors.initials: Y
authors.lastname: Cui
authors.forename: Hongzhu
authors.initials: H
authors.lastname: Wang
mesh_terms: D000818:Animals; D002681:China; D017753:Ecosystem; D009835:Oligochaeta / Q000033:anatomy & histology* / Q000145:classification*; D045483:Rivers