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