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.