FIGURES 65–71 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 65–71. Zygoceros rhombus Ehrenberg (Tampa, Florida). Fig. 65. Valve exterior, short elevations with ocelli at apices and submarginal spines, which are the openings from rimoportulae; scale bar = 20 μm. Fig. 66. Valve interior with radial rows of foramina and submarginal openings of rimoportulae; scale bar = 20 μm. Fig. 67. Exterior with ridged opening from fractured rimoportula, continuous cribrum linked by passage pores and buttressed branched spines covering valve; scale bar = 2 μm. Fig. 68. Rimmed ocellus at summit of elevation, narrow hyaline valve margin with raised border; scale bar = 5 μm. Fig. 69. Exterior with barely raised elevations, submarginal rimoportulae opening through spines; scale bar = 20 μm. Fig. 70. Interior with foramina and two openings from rimoportulae; scale bar = 5 μm. Fig. 71. Triangular valve with attached girdle bands, three short elevations with ocellus at summit; scale bar = 20 μm.