Reference

Wilhelm Foissner, Kuidong Xu (2005): Morphology, ontogenesis and encystment of a soil ciliate (Ciliophora, Haptorida), Arcuospathidium cultriforme (Penard 1922), with models for the formation of the oral buldge, the ciliary patterns, and the evolution of the spathidiids – Protistology – 4: 5 - 55.