A taxonomic group of single-celled protists with a funnel-shaped collar around their flagellum, once a major classification group.
From choana (funnel) + flagellata (possessing whip-like structures), this is a historical taxonomic name based on the distinctive collar-like structure surrounding the cell's swimming whip.
Choanoflagellata are sometimes called the 'missing link' between single-celled life and animals because they're so similar to sponge cells—studying them is like watching the moment in Earth's history when life decided to become multicellular!
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