The
specimens for this study were collected mostly from public
water reservoirs where no permits were required. Owners of
the private localities (a rice paddy and a waterfall) were asked
for their permission. The owners gave their verbal consent for
samples to be collected. All species of those snails are not
endangered or protected. The snails were sorted and identified
following the protocols in Brandt [26], Chitramvong [36], and
Upatham et al. [37]. In addition two subspecies (B. s. siamensis
and B. s. goniomphalos) were categorized by geographic
distribution.