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Identification Key: 4

Key Position: 4 Back to (3a)
4 a. Test with 1 to 8 spines on postero-lateral margin.

SEE Figure 4 -1

 4 b. Test "doughnut" shaped, without spines.

SEE Figure 4 -2
FIGURE 4 -1

Centropyxis aculeata Ehrenberg 1832 "aculeata"
Arcella aculeata EHRENBERG 1832, p. 91
Arcella aculeata "aculeata" REINHARDT et al. 1998, pl. 1, fig. 1
Remarks: Distinguished from Centropyxis aculeata "discoides" by having spines. It should be noted that on some specimens these spines have broken off, but the stubs at the bases of the spines remain.
Specimen from Crosswise Lake, near Cobalt, Ontario.

04a

 FIGURE 4 -2

Centropyxis aculeata Ehrenberg 1832 "discoides"
Arcella discoides EHRENBERG 1843, p. 139
Arcella discoides Ehrenberg, EHRENBERG 1872, p. 259, pl. 3, fig. 1
Arcella discoides Ehrenberg, LEIDY 1879, p. 173, pl. 28, figs. 14-38
Centropyxis aculeata var.discoides PENARD 1890, p. 150, pl. 5, figs. 38-41
Centropyxis discoides Penard [sic], OGDEN and HEDLEY 1980, p. 54, pl. 16, figs. a-e
Centropyxis aculeata "discoides" REINHARDT et al. 1998, pl. 1, fig. 2
Specimen from Crosswise Lake, near Cobalt, Ontario.

04b