Table 1. Association of geographical distributions between sinistral land snails and pareatid snakes.

Snail distribution	No. of genera		Proportion of sinistral genera (%)
	Sinistral	Dextral
Within the snake range	19	142	11.8
Outside the snake range	34	642	5.0

The order Stylommatophora excluding species unsuitable for analysis were used. In 33 genera, congeneric dextrals and sinistrals were counted as independent observations. Snail genera within the snake's range include those that are partly or fully sympatric with pareatid snakes.