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

1. Sola, A.
2. Guinea, A.
3. Fernández-Galiano, D.
4. Longás, J.F.
5. Corliss, J.O.