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FIGURES 31–36. Tursiocola olympica and T in Tursiocola denysii sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta)

FIGURES 31–36. Tursiocola olympica and T. staurolineata type populations, LM, specimens in valve view showing valve shape and size range. 31–33. Tursiocola olympica (holotype slide BRM! NA1/77). 34–36. Tursiocola staurolineata (isotype slide BRM! ZU4/76), Scale bar = 10 μm.

FIGURES 25–30. Tursiocola denysii. Type population, SEM. 25 in Tursiocola denysii sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta)

FIGURES 25–30. Tursiocola denysii. Type population, SEM. 25. Cingulum showing valvocopula (V) with four attached abvalvar copulae (numbered arrows) in side view. 26. Pars interior of valvocopula showing flanged margin and three pairs of opposing tabs. 27. Pars exterior of valvocopula showing thickening of the two pairs of polar tabs. 28. Detail of apex of valvocopula showing second row of abvalvar pores (arrow) located only at the poles. 29–30. Copulae showing open ends and only a single row of pores. Scale bars: Figs 25–27, 29–30= 2 μm, Fig. 28 = 1 μm.

FIGURES 22–24. Tursiocola denysii. Type population, SEM. 22 in Tursiocola denysii sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta)

FIGURES 22–24. Tursiocola denysii. Type population, SEM. 22. Internal view of whole valve showing pseudosepta and butterfly structure. 23. Detail of butterfly structure and internal central area with one knob on the raphe rib. 24. Internal view of whole valve with attached valvocopula. Note one central and 2 polar tabs underlying undulate valve margin on each side of the valve. Scale bars: Figs 22, 24 = 2 μm, Fig. 23 = 1 μm.

FIGURES 15–21. Tursiocola denysii. Type population, SEM. 15 in Tursiocola denysii sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta)

FIGURES 15–21. Tursiocola denysii. Type population, SEM. 15. Single valve with attached cingulum in girdle view. Note undulate mantle margin with three tabs. 16–17. External view of whole valves showing axial and central areas. 18. Detail of external central area of valve depicted in Fig. 16 showing bow tie-shaped stauros and proximal raphe ends within spathulate grooves. 19. Detail of external valve apex of valve depicted in Fig. 16 showing hooked distal raphe end obscured by overhanging siliceous flap. 20. Detail of external central area of valve depicted in Fig. 17 showing areolae structure. 21. Detail of external valve apex of valve depicted in Fig. 17. Scale bars: Figs 15–17 = 2 μm, Figs 18–21 = 1 μm.

FIGURES 1–14 in Tursiocola denysii sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta)

FIGURES 1–14. Tursiocola denysii. Type population, LM. 1–4. Frustules in girdle view showing size range and morphological variation. Arrows in Figs 1, 2, 8, 10 indicate pseudosepta. 5–13. Specimens in valve view showing size range. 14. Valvocopula. Scale bar: Figs 1–14 = 10 μm. = indicates same specimen at different foci.

FIGURES 69–71 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 69–71. Tursiocola sp. SEM. 69. Entire valve showing acute apices and arcuate outline in mantle view. Fig. 70. Detail of external central area in mantle view showing raised central area, stauros and areolae. 71. Detail of external valve apex in side view showing thickened valve margin and distal raphe end curving around apex (arrow). Scale bars: 69 = 1 μm; 70–71 = 1 μm.

FIGURES 20–24. Tursiocola ziemanii. Type population, SEM. 20 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 20–24. Tursiocola ziemanii. Type population, SEM. 20. Entire frustule in girdle view showing cingulum with 2 copulae, each with a double row of pores. 21. Internal view of valve with attached copula. 22. Cingulum comprised of 2 copulae open on one end (arrow) with 2 rows of pores. 23. Isolated copula showing closed end (arrow) and two rows of pores. 24. Internal view of cingulum showing open (arrow) and closed ends of copulae. Scale bars: 20–22, 24 = 10 μm; 23 = 5 μm.

FIGURES 14–19. Tursiocola ziemanii. Type population, SEM. 14–15 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 14–19. Tursiocola ziemanii. Type population, SEM. 14–15. External views of whole valves showing axial and central areas. 16. Internal view of whole valve showing pseudosepta and butterfly structure. 17. Detail of butterfly structure and internal central area with stauros (arrow) and two knobs on the raphe rib. 18. Detail of external central area showing diamond-shaped central area, stauros and deflected proximal raphe ends. 19. Detail of external valve apex showing apparently bifurcated distal raphe ends. Scale bars: 14–16 = 5

FIGURES 65–68. Tursiocola costata. Type population, SEM. 65 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 65–68. Tursiocola costata. Type population, SEM. 65. Internal view of whole valve showing pseudosepta and butterfly structure. 66. Detail of butterfly structure and internal hexagonal central area with two knobs on the raphe rib. 67. Isolated copula showing internal structure and opening at one end (arrow). 68. Isolated copula in girdle view showing opening at one end (short arrow), a single row of pores, and a central tab (long arrow) on the advalvar side. Scale bars: 65, 67–68 = 5 μm; 66 = 1 μm.

FIGURES 42–46. Tursiocola varicopulifera. Type population, SEM. 42 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 42–46. Tursiocola varicopulifera. Type population, SEM. 42. Internal view of whole valve showing pseudosepta and butterfly structure. 43. Detail of butterfly structure and internal oval central area with two knobs on the raphe rib. 44. Entire frustule in girdle view showing differentiated copulae and wide mantle areas. Long arrow indicates valvocopula; short arrow indicates abvalvar copula. 45. Valve and cingulum showing connections between valvocopula and valve margin. 46. Isolated valvocopula showing 3 tabs on advalvar side and 2 rows of elongated pores. Arrow indicates open end of valvocopula. Scale bars: 42, 44, 46 = 10 μm; 43 = 1 μm; 45 = 5 μm.

FIGURES 25–37 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 25–37. Tursiocola varicopulifera. Type population, LM. 25–29. Frustules in girdle view showing size range and morphological variation. Arrows indicate shadow lines of internal raphe ribs. 30–36. Specimens in valve view showing size range. 37. Isolated abvalvar copula with 1 row of pores. Scale bars: 25–37 = 10 μm. = indicates same specimen at different foci.

FIGURES 38–41. Tursiocola varicopulifera. Type population, SEM. 38 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 38–41. Tursiocola varicopulifera. Type population, SEM. 38. External view of whole valve showing axial and central areas. 39. Detail of external central area showing diamond-shaped central area, stauros and straight expanded proximal raphe ends. 40. Detail of external valve apex showing apparently bifurcated distal raphe ends. 41. Detail of external valve apex in mantle view showing transapically elongated areolae and spur-like extension of valve margin at apex. Scale bars. 38 = 10 μm; 39–41 = 1 μm.

FIGURES 1–13 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 1–13. Tursiocola ziemanii. Type population, LM. 1–6. Frustules in girdle view showing size range and morphological variation. 7–13. Specimens in valve view showing size range. Scale bars: 1–13 = 10 μm. = indicates same specimen at different foci.

FIGURES 47–57 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 47–57. Tursiocola costata. Type population, LM. 47–50. Frustules in girdle view showing size range. 51–57. Specimens in valve view showing size range and morphological variation. Scale bars. 47–57 = 10 μm. = indicates same specimen at different foci.

FIGURES 58–64. Tursiocola costata. Type population, SEM. 58 in Three New Species of Tursiocola (Bacillariophyta) from the Skin of the West Indian Manatee (Trichechus manatus)

FIGURES 58–64. Tursiocola costata. Type population, SEM. 58. External view of entire valve showing drawn out rostrate apices, asymmetric valve face, bent axial area, diamond-shaped central area and narrow stauros. 59. External view of central area showing deflection of proximal raphe ends. 60. External view of apparently bifurcated distal raphe end. 61. External oblique view of entire valve with attached cingulum showing raised interstriae costae and convergent striae on valve face, raised central area, distinct valve mantle and 2 copulae, each with 1 row of pores. 62. Entire frustule in girdle view showing raised interstriae costae and cingulum with 2 copulae, each with a single row of pores adjacent to the valve margin. 63. Detail of valve center and cingulum in oblique view showing transitions between valve face, mantle and margin. 64. Detail of external valve center in oblique view showing raised interstriae costae, round areolae and narrow stauros. Scale bars: 58, 61–62 = 5 μm; 59–60, 63–64 = 1 μm.