There is no such thing. 'Organelle' is the specialised structure within a cell. It has no relevance to 'locomotion'.
setae is the structure that is not associated with locomotion of protist
flagellum
flagellum
Yes. Flatworms lack a skeletal structure, and any creature without a skeletal structure is classified as an invertebrate.
Parasitic Cone
Provide structure and strength for locomotion and protection for the notochord/spinal cord.
Flatworms have a higher surface area/volume ratio compared to a cylindrical worm, this is one of the reasons for flatworms to have the structure they do.
Provide structure and strength for locomotion and protection for the notochord/spinal cord.
Parasites are what feed on your nutrients, as you should know. Flagellum is almost tail-like structure in a prokaryote. Parasitic Flagellates, therefore are parasites with flagellum
It is a flagellum and is used for locomotion.
Locomotion ... it acts as a lever system for the muscles to work on.