Key Position: 16 Back to (13b)
16 a. Test laterally compressed with 2 to 3 short spines.

SEE Figure 16-1

 19 b. Test not compressed laterally.

Proceed to 17

FIGURE 16-1

Difflugia bidens Penard 1902
Difflugia bidens PENARD 1902, p. 264, figs. 1-8
Difflugia bidens Penard MEDIOLI and SCOTT 1983, p. 21-22, pl. 1, figs. 1-5
Specimen from Swan Lake, north of Toronto, Ontario.