trochelminth

trochelminth

(ˈtrɒkəlˌmɪnθ)
n
(Animals) any invertebrate of the former taxonomic group Trochelminthes, which included the rotifers and gastrotrichs, now classed as separate phyla
[C19: from New Latin trochelminthes, from Greek trokhos wheel, from trekhein to run + helminth]