FIGURE 78 in Calcareous sponges of the Western Indian Ocean and Red Sea

FIGURE 78. Sycettusa zanzibaris (Jenkin, 1908), ZMA Por. 11566, a–i, SEM images of the spicules, a, giant diactine, b. trichoxea, c, small cortical diactine, d, cortical triactines, e, pseudosagittal triactines, f, subatrial sagittal triactines, g, small atrial tetractine, h, atrial tetractine with long apical actine wjich protrudes into the atrial cavity, i, regular tetractine from the oscular rim.