FIGURE 13 in Calcareous sponges of the Western Indian Ocean and Red Sea

FIGURE 13. Borojevia pirella sp.nov., holotype RMNH Por. 11622, from Rodrigues, a, light microscopic cross section of oscular region showing pseudoatrium and surrounding tubuli, b–e, SEM images of the spicules, b, regular triactine, c, rare sagittal irregular triactine, d, tetractines, e, details of apical actines of the tetractines showing characteristic verticil of three conical spines.