Figure 1.

Photomicrographs of some ciliates observed in the rumen of European bison. (A) Elytroplastron bubali; (B) Eudiplodinium maggii; (C) the illustration of two extreme sizes of E. maggii; (D,E) Ophryoscolex purkyniei; (F) (from left to right) Dasytricha ruminantium, Isotricha prostoma, Diplodinium dentatum, and Entodinium exiguum; (G,I) Isotricha intestinalis; (H,I) Epidinium parvicaudatum; (J) Metadinium esalqum; (K) Elytroplastron with engulfed Epidinium; (L) Eodinium posterovesiculatum; (M) Dasytricha ruminantium and Eremoplastron rostratum. Samples were colorized by (A,B,F,G,I–L) methyl-green formalin, (D,E,H,M) iodine solutions, and (C) pyridinated silver carbonate. Scale bars are 20 μm in all pictures.