"ENVO:01000123"^^ . "2010-03-17T04:43:05Z"^^ . . "ENVO"^^ . . "marine sponge reef biome"^^ . "pbuttigieg"^^ . "The marine sponge reef biome comprises marine reefs primarily built by marine sponges. The primary frame-building sponges are all members of the order Hexactinosa. They are found only in glacier-scoured troughs of low-angle continental shelf. The seafloor is stable and consists of rock, coarse gravel, and large boulders."^^ .