Reference

A. Sola, A. Guinea, D.D. Fernández-Galiano, J.F. Longas, John Ozro Corliss (1990): Description of two species of nassophorean ("hypostome") ciliates, Nassulopsis elegans (Ehrenberg, 1833) and Zosterodasys derouxi n.sp., with comments on their systematic and phylogenetic affinities – Europ. J. Protistol. – 26: 15 - 24.