English: Light (A–D) and electron (E–H) microscopic images of Develorapax marinus. (A,C) Trophont, (B) swimming cell, (D) two daughter cells still connected by thin cytoplasmic bridge (arrowhead). (A,B) DIC, (C,D) phase contrast. (E) General view at longitudinal section, (F) some organelles and portion of nucleus at higher magnification (arrow shows an axial filament in the crista), (G) structure of vacuoles and dense bodies, (H) dense body at higher magnification. Scale bar: (A–D) 5 μm; (E,G) 500 nm; (F) 300 nm; (H) 125 nm. Abbreviations: af, anterior flagellum; b, bacteria; db, dense bodies; fv, food vacuole; ga, Golgi apparatus; kp, kinetoplast of the prey; k1, kinetosome of posterior flagellum; k2, kinetosome of anterior flagellum; l, lipid globule; m, mitochondrion; mp, mitochondrion of the prey; n, nucleus; nu, nucleolus; pf, posterior flagellum; pr, prey; ps, pseudopodium; r1–r4, microtubular flagellar roots; smt, secondary microtubules of r3; tm, tubular mastigonemes; tp, transversal plate; v, vacuole.