Key Position: 17 Back to (16b)
17 a. Fundus with 1 to 10 short spines; aperture circular, crenulated by 6 to 20 indentations forming thin collar.

SEE Figure 17-1

 17 b. Fundus without spines; aperture without crenulations.

Proceed to 18

FIGURE 17-1

Difflugia corona Wallich 1864
Difflugia protaeiformis (sic) Ehrenberg subsp. D. globularis (Dujardin) var. D. corona WALLICH 1864, p. 244, pl. 15, fig. 4a-c, pl. 16, figs. 19, 20
Difflugia corona Wallich 1864 ARCHER 1866, p. 186
Difflugia corona Wallich REINHARDT et al. 1998, pl. 2, fig. 1
Specimen from Peterson Lake, near Cobalt, Ontario.