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Identification Key: 6

Key Position: 6 Back to (5b)
6 a. Test less flattened than 6b with generally 3 or less spines on fundus, but may have more.

SEE Figure 6 -1

 6 b. Test more flattened than 6a with 4 or more spines on fundus.

SEE Figure 6 -2
FIGURE 6 -1

Centropyxis constricta (Ehrenberg 1843) "constricta"
Arcella constricta EHRENBERG 1843, p. 410, pl. 4, fig. 35, pl. 5, fig. 1
Centropyxis constricta "constricta" REINHARDT et al. 1998, pl. 1, fig. 4
Specimen from Crosswise Lake, near Cobalt, Ontario.

06a

 FIGURE 6 -2

Centropyxis constricta (Ehrenberg 1843) "spinosa"
Centropyxis spinosa CASH in CASH and HOPKINSON 1905, p. 135, text figs. 26 a-c, pl. 16, fig. 15
Centropyxis spinosa Cash, OGDEN and HEDLEY 1980, p. 62, pl. 20, figs. a-d
Centropyxis constricta "spinosa" REINHARDT et al. 1998, pl. 1, fig. 5
Specimen from Peterson Lake, near Cobalt, Ontario.

06b