FIGURES 34–53 in New species and a new genus of the Orthoseirales from Patagonia, Argentina, with comments on systematic affinities within the Order

FIGURES 34–53. Orthoseira ferrarioana spec. nov. Specimens of type population. 34–46. LM. 47–53. SEM. 34–43. Valve views showing population variability. 40. Holotype. 44–46. Specimen in girdle view at different foci. 47–49. External valve views. 47. Whole valve. 48. Detail of valve center showing external openings of carinoportulae (arrow). 49. Detail of valve in oblique view, note the marginal spines. 50–53. Internal valve views. 50. Whole valve. 51. Detail of valve center showing the internal openings of carinoportulae (arrow) and the slits between them (arrowheads). 52. Detail of the striae arrangement. 53. Detail of a broken valve showing the thickened interstriae. Scale bars = 10 μm (Figs. 34–47, 50), 5 μm (Fig. 49), 2 μm (Figs 48, 52–53), 1 μm (Fig. 51). Bar length is the same in all LM figures.