Caulospongia biflabellata, commonly known as the western staircase sponge, is a species of sea sponge belonging to the family Suberitidae.

It is a marine sponge of the temperate waters of Australia (Northwest Cape to Albany, WA).

[2] It was first described by Jane Fromont in 1998, from a specimen collected from Limestone reef flat, Cheyne Beach, Western Australia[1][3]

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