Reference

L.F. Li, S. Thorsten, S.M. Kyoon, Khaled A. S. AL-Rasheid, A. Al-Khedhairy Bdulaziz, Weibo Song (2010): Protocruzia, a highly ambiguous ciliate (Protozoa; Ciliophora): Very likely an ancestral form for Heterotrichea, Colpodea or Spirotrichea? With reevaluation of its evolutionary position based on multigene analyses – Sci China Life Sci. – 53: 131 - 138.