periplasmic flagellum
Flagellar filaments located in the periplasmic space; characterized in spirochetes, in which they are essential for shape and motility. Composed of a core surrounded by two sheath layers, the flagella rotate to allow migration of the cell through viscous media, which would not be possible using external flagella.
GO:0009288
bacterial-type flagellum
is_a
GO:0043264
extracellular membraneless organelle
is_a
GO:0042597
periplasmic space
part_of