FIGURE 6A–H. Achramorpha grandinis. A in Description of new chiactine-bearing sponges provides insights into the higher classification of Calcaronea (Porifera: Calcarea)

FIGURE 6A–H. Achramorpha grandinis. A: preserved holotype BMNH-1907.8.6.108. B–C: SEM of the cortical layer. D–E: histological section of the cortical layer and oscular region. F–H: SEM images of spicules; microdiactine (F), cortical triactine (G) and chiactines and tetractine (H). Abbreviations: Chi = chiactines; Di = diactines; Mic = microdiactines; Os = osculum; Tet = tetractines.