FIGURE 5 in Adaptive morpho-traits, taxonomy and biogeography of Metania Gray, 1867 (Porifera: Spongillina: Metaniidae) with the description of a new species from Madagascar

FIGURE 5. Metania madagascariensis sp. nov. Holotype MSNG 57788 from the Matsiatra River. Body architecture (SEM micrographs). A. Sponge surface (ectosome) with conules and apertures of the aquiferous system in the dermal membrane (ectosomal skeleton, top view); B. Spiny microscleres (detail of A); C. Dermal membrane strongly armed by tangential spiny microscleres (ectosomal skeleton, detail of A); D. Skeletal architecture of the ectosomal and choanosomal skeleton (cross section); E. Skeleton of stout oxeas in an irregular network of mono- to pauci-spicular tracts; F. Ascending spicular fibre supporting a conule at the sponge surface; G. Meshes of choanosomal skeleton with pauci- to multi-spicular tracts of megascleres, and scattered microscleres; H. Dense assemblages of microscleres in choanosomal skeleton; I. Basal spongin plate well developed, tangentially armed by megascleres as stout, smooth oxeas and by microscleres as spiny oxeas.