Assertion: euglena's flagellum | /r/CapableOf | sit within sulcus
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Source sentences:
text: In phagotrophic lineages, the flagella are heterodynamic, where one flagellum (i.e. the dorsal or anterior flagellum) is held straight in front of the cell and the other flagellum (i.e. the ventral, recurrent or posterior flagellum) is bent backwards, sits within a ventral groove or sulcus and trials the cell (see Fig. 3).