Table 1. Average (95% Confidence Intervals) crushing resistance (in Newtons) uncorrected by shell length for populations of Mexipyrgus churinceanus (Mc), Mexithauma quadripaludium (Mq) and Nymphophilus minckleyi (Nm).
| Location | Mc | Mq | Nm |
| Juan Santos (JS) | 65.33 (58.47, 72.19) | 90.46 (78.19, 102.74) | 105.69 (94.74, 116.64) |
| Churince (CH) | 79.45 (72.52, 86.38) | 109.18 (96.92, 121.43) | 109.40 (98.32, 120.48) |
| Mojarral Este Baja (MEB) | 89.81 (84.19, 95.42) | 110.46 (98.15, 122.77) | 134.45 (123.049, 145.41) |
| Los Remojos Negro (LRN) | 65.76 (56.94, 74.59) | 112.24 (99.98, 124.49) | 102.99 (92.06, 113.92) |
| Los Remojos Blanco (LRB) | 70.53 (63.44, 77.62) | 117.76 (105.48, 130.03) | 115.85 (104.90, 126.80) |
| Tierra Blanca (TB) | 108.38 (99.96, 116.81) | 122.60 (110.35, 134.86) | 125.20 (113.73, 136.67) |
| Mojarral Este Alta (MEA) | 70.94 (62.93, 78.95) | 123.97 (111.70, 136.25) | 108.84 (97.79, 119.88) |
| Tío Cándido (TCS) | 101.29 (94.96, 107.63) | 126.11 (113.82, 138.39) | 128.86 (117.90, 139.83) |
| Mojarral Oeste (MO) | 47.42 (36.11, 58.73) | 130.25 (117.97, 142.52) | 129.96 (118.82, 141.11) |
| Río Mesquites (RM) | 98.48 (90.80, 106.15) | 136.76 (124.26, 149.26) | 117.31 (106.37, 128.25) |
| North Tío Cándido (TCN) | 108.22 (100.43, 116.01) | 139.89 (127.53, 152.25) | 142.36 (131.39, 153.32) |