A genus of acorn worms, small marine animals that burrow in ocean sediment and feed by filtering water through their proboscis.
From Greek 'balanos' (acorn) plus 'glossa' (tongue), combining references to the creature's acorn-shaped proboscis and tongue-like feeding apparatus.
Balanoglossus species are transitional creatures in evolution—they're invertebrates, but they have structures (like a notochord) that connect them to vertebrates, making them a crucial 'missing link' in understanding animal evolution.
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