An individual member of the Ceratospongiae class, a horny or fibrous sponge.
From Ceratospongiae (the sponge class) + '-an' (member of). A singular form naming individual sponges within this horny-skeletal group.
A single ceratospongian sponge is immortal in a weird way—if you break it into pieces and put them in the ocean, each fragment can regenerate into a whole new sponge, making them one of nature's most resilient creatures.
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