FIGURES 36–43 in Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera

FIGURES 36–43. Parontella ruthenica (Witt) D. M. Williams & P.A. Sims (Moreno, California, USA). Fig. 36. Exterior tilted with outwardly directed elevations at apices, marginal ridge of spines, ten long submarginal hollow spines (openings from rimoportulae); scale bar = 50 μm. Fig. 37. Valve face with transapical rows of loculi meeting at central sternum (arrow) and mantle with lines of poroids bound by barely raised longitudinal costae; scale bar = 15 μm. Fig. 38. Vale exterior tilted with 7 long hollow submarginal spines and spinules on valve face; scale bar = 43 μm. Fig. 39. Valve interior with openings from 9 rimoportulae and marginal ridge of fused spines; scale bar = 50 μm. Fig. 40. Interior with foramina and openings of two rimoportulae; scale bar = 6 μm. Fig. 41. Elevation with flattened summit and ocellus on distal face; scale bar = 5 μm. Figs 42–43. B.M. 52964, specimens from Ananino, Simbirsk. Fig. 42. Valve face 121 μm x 58 μm. Fig. 43. Mantle view, specimen 95 μm long.