Cladistic scheme generated by the Hennigian argumentation scheme. For character coding, see Table 2 and section on character states. Black squares mark apomorphies. Asterisks denote convergences. 1, order Halteriida (class Oligotrichea, subclass Halteriia); 2, order Oligotrichida (class Oligotrichea, subclass Oligotrichia); 3, suborder Strobilidiina (class Oligotrichea, subclass Oligotrichia, order Choreotrichida); 4, suborder Tintinnina (class Oligotrichea, subclass Oligotrichia, order Choreotrichida).