Numbers and percentages of dextral and sinistral species in the various families, in the four regions.

Only the sinistral camaenid species have shells that are not clearly higher than broad. S−C = percentage of sinistrality when clausiliid species are excluded. We follow Wade et al. [39] in considering Bradybaenidae Pilsbry, 1934, a junior synonym of Camaenidae Pilsbry, 1895.