FIGURE 51 in Calcareous sponges of the Western Indian Ocean and Red Sea

FIGURE 51. Pericharax orientalis Van Soest & De Voogd, 2015, RMNH Por. 10157, from the Maldives, a, habitus in situ (photo N.J. de Voogd), b, on deck, c, cross section of atrial wall to show apical actines of the tetractines protruding in the atrial lumen, d–h, SEM images of the spicules, d, giant triactine, e, cortical triactine, f, small triactine, g, tetractine, h, detail of g showing thin apical actine.