FIGURE 8 in Deep Water Polymastiidae (Porifera, Polymastiida) from the South West Pacific

FIGURE 8. Ridleia echidna sp. nov. A. The upper surface of the holotype QM G337550 after fixation. B. Cross section through the holotype, showing the radial palisade of the long tylostyles and the collagenous base of the ectosome, as well as the cavernous choanosome. C. SEM of a cross section through the holotype, showing the radial palisade of the long tylostyles, the composition of the collagenous base and small tracts of tylostyles in the cavernous choanosome. D. SEM close-up of the long tylostyles forming the ectosomal palisade. E. The long ectosomal tylostyles. F. The magnified ends of the tylostyle in E. G. The intermediate tylostyles that form the tangential layer of the choanosome. H. The small tylostyles that radiate from the base of the ectosome.