FIGURE 5. Tubifex gracilentus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 5. Tubifex gracilentus n. sp. A. Ventral chaeta in II. B. Ventral chaeta in IV. C. Ventral chaeta in a posterior segment. D. Distal tip of dorsal pectinate chaeta in VIII. E. Spermatheca. F. Penial sheath. G. Male genitalia in X–XII, dorsal view. H. Male genitalia in X–XII, lateral view. Scale bars: A–D. 20 µm; E–H. 100 µm.