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Identification Key: 11

Key Position: 11 Back to (10b)
11 a. Aperture lip thin, crenulated, terminal, circular, surrounded by a 3- or 4-lobed collar.

SEE Figure 11-1

 11 b. Aperture terminal, circular or lobed.

Proceed to 12

FIGURE 11-1

Cucurbitella tricuspis (Carter 1856)
Difflugia tricuspis CARTER 1856, p. 221, fig. 80
Cucurbitella tricuspis (Carter) MEDIOLI, SCOTT, and ABBOTT, 1987, p. 42, pls. 1-4, text figs. 1, 4
Cucurbitella tricuspis (Carter) REINHARDT et al. 1998, pl. 1, fig. 7
Remarks: This species has a seasonally controlled irregularly shaped test, being larger and spherical during the benthic phase, and smaller and vase-shaped during the planktic phase. The crenulated aperture has a variable number of teeth ranging from three to twenty, depending on the number of teeth on the parent test (Medioli, personal commun., 1996).
Specimen from Peterson Lake, near Cobalt, Ontario.

11a