Comparative morphology of microsclere structure in Spongilla alba, S.
Species identification was determined from spicule morphology of megascleres, microscleres, and gemmoscleres (Penney and Racek, 1968) and independently confirmed by M.
Gemmoscleres and microscleres were used to determine species (Poirrier, 1972).
living species) form attributed to the fossil genus Iouea, because of significant differences in the composition of the desmas and the uncertainty of microsclere
geometries in the fossil genus.