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Table 2 Morphometric characterization of the two morphotypes living syntopically (Tenis Lake, Omsk Region, Russia)

From: A comparative study of shell variation in two morphotypes of Lymnaea stagnalis (Mollusca: Gastropoda: Pulmonata)

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
  1. aItalic values, minimum and maximum values; upright values, mean value and standard deviation (σ). n.s., non-significant difference between mean values. The significance of differences is checked by Student's t test.