Figure 2

TEM picture of Euplotes vanleeuwenhoeki sp. nov. (A–C) Cortex region; (D–F) Oral region; (A) Ciliary pit (CP) with dikinetid (Dk); (B) Detail of bristle pit containing filamentous material (arrowhead); cortical ampules (CA) are visible; (C) Transverse section of dikinetid (Dk) surrounded by cortical ampules; sections of the macronucleus (Ma), two mitochondria (Mt) and an endosymbiotic bacterium (arrow) are visible; (D) Detail of oral membranelles, composed of two longer rows (1, 2) and one shorter row (3) of cilia; membranelles are separated by ridges (R); (E) Section of oral region, showing paraoral membrane (Pa) in front of oral membranelles and pharingeal disks (PD); (F) Closer view of paraoral membrane and transverse section of macronucleus; (G) Endosymbiotic bacterial cells (arrow) inside Euplotes cytoplasm, nearby macronucleus and micronucleus (Mi); rosettes of glycogen (G) and lipid droplets (L) are present; (H) Detail of contractile vacuole (CV) and transverse cirrus (TC); (I) Section of cirrus (double arrowhead), close to mitochondria; (J) Two phagosomes (Ph). CA cortical ampules, CP ciliary pit, CV contractile vacuole, Dk dikinetid, G rosette of glycogen, L lipid droplet, Ma macronucleus, Mi micronucleus, Mt mitochondrion, Pa paraoral membrane, PD pharingeal disk, Ph phagosome, R ridge, TC transverse cirrus, Arrowhead: filamentous material; Arrow: endosymbiotic bacterium; Double arrowhead: transverse section of cirrus. Bars stand for 1 µm.