*3.2.13 Stenothyridae*

The Stenothyridae is comprised of small-sized gastropods found in intertidal and shallow-water aquatic habitats in Asia and Australia. Also, this family is very diverse in the Mekong River. The species live in fresh or brackish water on sandy ground, on stones and decaying wood or buried in the mud where they feed on decaying organic matter. Dung et al. [70] reported, however, pleurolophocercous cercariae were shed by *Stenothyra messageri* in the Red River Delta; these cercariae were not identified to species but they could potentially be zoonotic.

### *3.2.14 Other caenogastropod species*

Some predominantly marine species may enter rivers. For example, the neogastopod *Anentome helena* (**Figure 7**) is found in the Mekong River in Vietnam and Thailand. The species is common in the Mekong River and is exported to Europe and Americas where it is used to control snails in hobbyist's aquaria. In the wild, it probably primarily feeds on carrion rather than seeking live prey.
