3. # 2004 Astraeospongia. Another Paleozoic calcareous sponge. Find a star-shaped spicule. The Sponge was a dish-shaped mass of organic material around these spicules. This fossil is essentially the ...
He says, ‘I hope they ask the question: “what is that?”’. Resembling a boat’s anchor, these are the minuscule projections from the skin of a sea cucumber, known as spicules. These needle-sharp ...
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