[4] Size is the only morphological difference compared to its natural host possibly due to host-induced variation.

[5] S. malayensis eggs have been found in liver granulomas, embedded within dense, fibrous tissue.

This species is known to be located in limestone areas in the foothills of the mountain chains of Kedah and Perak States in West Malaysia.

R. muelleri has been found in lowland secondary, and disturbed primary forests in wet conditions in Western Malaysia.

R. muelleri is often found near river banks due to the species prioritization of crustaceans and mollusks over other food sources, such as insects.

It is possible infected rodents defecate in bodies of water they hunt for prey in, maintaining a constant contamination with S. malayensis eggs and continuing the life cycle.