A genus of extinct sponges from ancient seas, lacking column-like structures.
From Greek 'a-' (without), 'stylos' (column), and 'spongia' (sponge), literally 'columnless sponge.' A paleontological term for fossil organisms.
These ancient sponges lived hundreds of millions of years ago when Earth's oceans were alien worlds—studying their fossils helps scientists understand how simple life forms first evolved and diversified.
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