[2][3] Its name is derived from the Latin crumilla ("money purse") and spongia ("sponge"), a reflection of its similarity to a small leathery money purse.

That is, it has a saclike shape, and its wall has holes of two sizes, with a well-developed internal canal system.

[2] 49 specimens of Crumillospongia are known from the Greater Phyllopod bed, where they comprise 0.1% of the community.

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