Helmet‐shaped Body of Entodiniomorphid Ciliates (Ciliophora, Entodiniomorphida), a Synapomorphy or a Homoplasy?

Triadinium was created to include Triadinium caudatum . Further, four other species were included, T. minimum , T. galea , T. elongatum , and T. magnum , all sharing a characteristic helmet‐shaped body. Wolska and Grain argued that the inclusion of T. minimum and T. galea into Triadinium was done based on superficial morphological aspects, and established two new genera to accommodate these species: Circodinium and Gassovskiella . Although the...