The flat leaf sponge (Isodictya grandis) is a species of marine demosponge in the family Isodictyidae. This sponge is known from the west coast of South Africa to False Bay. It is endemic to this region.Samaai, T. and Gibbons, M.J. 2005. Demospongiae taxonomy and biodiversity of the Benguela region on the west coast of South Africa. Afr. Nat. Hist. 1(1):1-96
Description The flat leaf sponge may grow to 1 cm thick and 20 cm high. It is an erect, thin-bladed sponge, with the blades narrowing to points at the tips. Its texture is smooth but slightly hairy with small oscula on the blade edges. It is orange-red in colour.Jones, Georgina. A field guide to the marine animals of the Cape Peninsula. SURG, Cape Town, 2008.
Habitat This sponge lives on rocky reefs from 15-37m.
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