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Table 2 Morphometric characterization of the two morphotypes living syntopically (Tenis Lake, Omsk Region, Russia)
| Character/index | Morphotypea | pvalue | |
|---|---|---|---|
| Fragilis | Stagnalis | ||
| Whorls number | 6.00 to 7.00 | 5.87 to 7.37 | n.s. |
| 6.67 ± 0.23 | 6.56 ± 0.30 | ||
| Shell height (SH) | 25.1 to 39.1 | 34.9 to 46.8 | 0.00 |
| 34.6 ± 2.9 | 40.8 ± 2.7 | ||
| Shell width (SW) | 11.8 to 19.3 | 17.3 to 24.0 | 0.00 |
| 17.2 ± 1.5 | 20.7 ± 1.6 | ||
| Spire height (ShH) | 12.5 to 20.4 | 16.4 to 24.6 | 0.00 |
| 17.5 ± 1.7 | 20.7 ± 2.0 | ||
| Body whorl height (BWH) | 17.8 to 29.3 | 26.6 to 35.7 | 0.00 |
| 26.2 ± 2.2 | 31.5 ± 2.0 | ||
| Aperture height (AH) | 12.2 to 22.1 | 18.9 to 27.3 | 0.00 |
| 19.7 ± 1.2 | 23.7 ± 1.5 | ||
| Aperture width (AW) | 9.3 to 13.8 | 11.0 to 22.4 | 0.00 |
| 12.5 ± 1.0 | 14.9 ± 1.6 | ||
| SW/SH | 0.45 to 0.58 | 0.46 to 0.56 | n.s. |
| 0.51 ± 0.03 | 0.50 ± 0.02 | ||
| SpH/SH | 0.45 to 0.57 | 0.48 to 0.55 | n.s. |
| 0.51 ± 0.03 | 0.51 ± 0.02 | ||
| BWH/SH | 0.73 to 0.83 | 0.71 to 0.81 | 0.004 |
| 0.77 ± 0.02 | 0.75 ± 0.03 | ||
| AH/SH | 0.50 to 0.70 | 0.51 to 0.61 | 0.048 |
| 0.58 ± 0.03 | 0.56 ± 0.03 | ||
| AW/AH | 0.52 to 0.80 | 0.52 to 0.74 | n.s. |
| 0.63 ± 0.05 | 0.64 ± 0.04 | ||
