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.