Mommy Taenia solium and her 3 motile proglottids. Note Jaydee's hooked rostellum, 4 suckers and proglottids of increasing length (arrows).
As an interesting coincidence, these 2 ladies also came as T. solium with accompanying eosinophils for their dates. Each have 3 proglottids in their costume. Near the end of my 'wild' parasite party, the eosinophils degranulated and the parasites had to fend for themselves.
My lead tech and parasite queen extraordinaire came as a D. caninum egg packet containing ova with appropriately hooked onchopheres.
We also had a little parasite who couldn't make it to the party but was too cute to leave out: a little Dermatobia hominis