Key Position: 15 Back to (14b)
15 a. Test made from coarse grains, opaque.

SEE Figure 15 -1

 15 b. Test agglutinated with silt or fine sand-sized xenosomes, hyaline; may have a slight constriction in the anterior part.

SEE Figure 15 -2
FIGURE 15 -1

Difflugia protaeiformis Lamarck 1816 "claviformis"
Difflugia protaeiformis LAMARCK 1816, p. 95
Difflugia pyriformis var. claviformis PENARD 1899, p. 25, pl. 2, figs. 12-14
Difflugia claviformis OGDEN and HEDLEY 1980, p. 126, pl. 52, figs. a-d
Difflugia proteiformis "proteiformis" [sic.] ASIOLI et al. 1996, p. 250, pl. 2, fig. 1 a-b
Difflugia protaeiformis "claviformis" REINHARDT et al. 1998, pl. 2, fig. 3
Remarks: Distinguished from Difflugia protaeiformis "acuminata" by having a thicker wall, which appears opaque under a light microscope.
Specimen from Peterson Lake, near Cobalt, Ontario.

FIGURE 15 -2

Difflugia protaeiformis Lamarck 1816 "acuminata"
Difflugia protaeiformis LAMARCK 1816, p. 95
Difflugia acuminata EHRENBERG 1830, p. 95
Difflugia acuminata Ehrenberg 1830, OGDEN and HEDLEY 1980, p. 118, pl. 4, figs. a-c
Difflugia acuminata Ehrenberg 1830, SCOTT and MEDIOLI 1983, p. 818, fig. 9d
Difflugia protaeiformis "acuminata" REINHARDT et al. 1998, pl. 2, fig. 5
Remarks: Distinguished from Difflugia protaeiformis "claviformis" by having a thinner wall which appears transparent under a light microscope.
Specimen from Crosswise Lake, near Cobalt, Ontario.