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FIGURE 6. Tubifex tubifex, cross sections from genital region. A in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 6. Tubifex tubifex, cross sections from genital region. A, anterior portion of XI. B, median portion of XI, with penial sacs. C, posterior portion of XI, with atrial ampullae and prostates. Scale bar 50 µm.

FIGURE 3. Varichaetadrilus harmani, cross sections from genital region. A in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 3. Varichaetadrilus harmani, cross sections from genital region. A, end of IX (below) and beginning of X (above). B, X. C and D, XI. Scale bar 50 µm.

FIGURE 5. Tubifex tubifex. A–D in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 5. Tubifex tubifex. A–D, ventral chaetae: A, from II, B, from IV, C, from midbody, D, from tail region. E–G, dorsal chaetae: E, from III, F, from V, G, from midbody. H, spermatheca (partially extracted from body). I–K, cross sections of male duct. I, proximal portion of vas deferens, J, distal portion of vas deferens, K, distal portion of atrium. L, penial apparatus and a stretch of proximal portion of vas deferens in a whole mount. Scale bars: A–G 20 µm, H 200 µm, I–L 50 µm.

FIGURE 2. Varichaetadrilus harmani. A–D in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 2. Varichaetadrilus harmani. A–D, ventral chaetae: A, from II, B, from IV, C, from IX, D, from XV. E–G, dorsal chaetae: E, from V, F, from VII, G, from XV. H, penial sheath. I, spermatheca with spermatozeugmata (extracted from body, with uncomplete duct). Scale bars: A–H 20 µm, I 50 µm.

FIGURE 1. Varichaetadrilus harmani. A in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 1. Varichaetadrilus harmani. A, forebody of mature individual. B, C, regenerating anterior ends. D, forebody of immature individual. Scale bar 200 µm.

FIGURE 10 in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 10. Tubifex tubifex (Müller, 1774), specimens from Tibet. A. Spermatheca. B–C. Lateral view of male genitalia in segment XI. Scale bar: A–C. 100 µm.

FIGURE 8 in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 8. Tubifex conicus He, Cui & Wang, 2012. A, B. Male genitalia, lateral view. C. Penial sheath. Scar bars: A–C. 100 µm.

FIGURE 2. Tubifex laxus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 2. Tubifex laxus n. sp., micrographs from stained whole mounts. A. Lateral view of anterior body. B–D. Ventrolateral view of male genitalia. Scale bars: A. 200 µm; B–D. 50 µm.

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.

FIGURE 9 in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 9. Tubifex tubifex (Müller, 1774), specimens from Tibet, SEM micrographs. A. Lateral view of anterior body. B. Spermathecal pore in X and male pore in XI. C. Hairs and pectinate chaetae in V. D. Dorsal pectinate chaeta in XII. E. Ventral chaetae in III. F. Ventral chaetae in XVI. Scale bars: A. 1000 µm; B. 500 µm; D. 10 µm; C, E, F. 20 µm.

FIGURE 1. Tubifex laxus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 1. Tubifex laxus n. sp., SEM micrographs. A. Lateral view of anterior body. B. Hairs in IV. C. Hair chaeta and palmate chaeta in XII. D. Dorsal palmate chaetae in XII. E. Ventral chaetae in IV. F. Ventral chaetae in XIII. Scale bars: A. 500 µm; B, C. 10 µm; D–F. 20 µm.

FIGURE 4. Tubifex gracilentus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 4. Tubifex gracilentus n. sp., SEM micrographs. A. Lateral view of anterior body. B. Hair in IV. C. Hair in XII. D. Dorsal pectinate chaeta in XII. E. Ventral chaeta in IV. F. Ventral chaeta in XIII. Scale bars: A. 500 µm; B–F. 20 µm.

FIGURE 6. Tubifex gracilentus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 6. Tubifex gracilentus n. sp., micrographs from live worms. A. Ventral view of male genitalia in X–XII. B. Penial sheath and muscular bulb. C. Spermatheca and male pore.

FIGURE 3. Tubifex laxus n in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 3. Tubifex laxus n. sp. A. Lateral view of head region. B. Ventral chaeta in IV. C. Ventral chaeta in a posterior segment. D. Distal tip of dorsal palmate chaeta in VIII. E. Penial sheath. F. Lateral view of male genitalia in X–XI. Scale bars: A. 100 µm; B–D. 20 µm; E, F. 100 µm.

FIGURE 7 in Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China

FIGURE 7. Tubifex conicus He, Cui & Wang, 2012, SEM micrographs. A. Dorsal chaetae in VII. B. Hair chaeta in a posterior segment. C. Ventral chaetae in II. D. Ventral chaetae in a posterior segment. Scale bars: A–D. 20 µm.

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FIGURE 4 in A Nearctic tubificid Varichaetadrilus harmani (Loden) n. comb. in a Dutch wetland, with remarks on Tubifex tubifex (Müller) (Annelida: Oligochaeta)

FIGURE 4. Tubifex tubifex, forebody of mature individual. Scale bar 200 µm.