Woodruffia Metabolica: the Systematic Implications of Its Somatic and Oral Ultrastructures*

The somatic and oral ultrastructures of Woodruffia metabolica Johnson & Larson are described. the somatic kinetids are dikinetids, with the anterior kinetosome often not ciliated. A transverse ribbon of microtubules and a single postciliary microtubule are associated with the anterior kinetosome. A transverse ribbon, postciliary ribbon and kinetodesmal fibril are linked with the posterior kinetosome. the posterior transverse ribbons extend posteriad, to the left of the Kinety, joining more anteriorly originating transverse ribbons in a compound LKm fiber. These features together with interkinetosomal linkages relate Woodruffia to other members of the order Colpodida.