This term is obsolete.
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OBSOLETE. Long whiplike or feathery structures borne either singly or in groups by the motile cells of many bacteria and unicellular eukaryotes and by the motile male gametes of many eukaryotic organisms, which propel the cell through a liquid medium.
This term was made obsolete because it was an unnecessary grouping term. Eukaryotic flagella were deemed to be equivalent to cilia and merged, so the only remaining child to this term was 'bacterial-type flagellum ; GO:0009288'.