pleosponge

noun

ple·​o·​sponge

ˈplēəˌspənj

: any of various Lower and Middle Cambrian calcareous, cylindrical or cup-shaped, double-walled, porous fossils that may be the remains of sponges or primordial precursors of the true corals

Word History

Etymology

New Latin Pleospongia, from pleio- + -spongia

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