Fig. 3

Oral and somatic ciliature of Frontonia vernalis (Neotype) (a, c, e, f) and Frontonia paravernalis sp. nov. (b, d, g, h) after silver impregnation. a Schematic drawing of oral apparatus of F. vernalis; b schematic drawing of oral apparatus of F. paravernalis; c closer view of F. vernalis oral ciliature and of the postoral suture (PtS), formed by a cortex folding (black arrowhead) and by an empty line, free of cilia (white arrowhead); d closer view of F. paravernalis oral ciliature and of the PtS; e, f ventral and dorsal somatic ciliature of F. vernalis; g, h ventral and dorsal somatic ciliature of F. paravernalis. OA – oral aperture; P1, P2, P3 - first, second, third peniculus; PCV - pore of contractile vacuole; PK – postoral kineties; PM – paroral membrane; PrS – preoral suture; PtS – postoral suture; VK – vestibular kineties; Arrow – dorsal set of kineties parallel to the preoral suture; Black Arrowhead – cortex folding, similar to a comb, forming part of the PtS; Double Arrowhead – longitudinal dorsal stripe of adjacent kineties; White Arrowhead – cortex line, free of cilia, forming part of the PtS. Bars stand for 20 μm (e-h), 10 μm (c, d)