FIGURE 8 in Adaptive morpho-traits, taxonomy and biogeography of Metania Gray, 1867 (Porifera: Spongillina: Metaniidae) with the description of a new species from Madagascar

FIGURE 8. Metania madagascariensis sp. nov. Holotype MSNG 57788 from the Matsiatra River. Gemmule architecture (SEM). A-B. Gemmule without gemmular cage; foramen with conical tubule and simple collar surrounded by distal tips of some rows of gemmuloscleres (B detail of A); C-D. Gemmule with gemmular cage of stout, smooth megascleres; foramen with simple collar surrounded by distal tips of gemmuloscleres (D detail of C); E-F. Gemmular surface covered by skeletal microscleres (spiny oxeas); microscleres on gemmular surface (F detail of E); G. gemmular theca with the fibrous pneumatic layer (cross section) and short foraminal tube; H. magnification of the trilayered gemmular theca with outer layer armed by gemmuloscleres distal tips, fibrous pneumatic layer with a monolayer of radially embedded tubelliform gemmuloscleres, and sublayered inner layer of compact spongin.