| Key Position: 21 | Back to (20b) |
| 21 a. Aperture very small with expanded flanged collar of variable width.
SEE Figure 21-1 |
21 b. Aperture wide, collar of variable shapes and sizes. |
| FIGURE 21-1
Difflugia urens Patterson et al. 1985
|
|
| Key Position: 21 | Back to (20b) |
| 21 a. Aperture very small with expanded flanged collar of variable width.
SEE Figure 21-1 |
21 b. Aperture wide, collar of variable shapes and sizes. |
| FIGURE 21-1
Difflugia urens Patterson et al. 1985
|
|