This lifeform is widespread in North America. This lifeform is very common in suitable environments.

Clinostomum marginatum (=C. complanatum) is usually encountered as a common yellow grub attached to or within numerous species of North American fresh water fish. This lifeform can use herons and snails for various stages in its life cycle. Refer to Hoffman for a more detailed description.

Animal Kingdom contains numerous organisms that feed on other animals or plants. Included in the animal kingdom are the lower marine invertebrates such as sponges and corals, the jointed legged animals such as insects and spiders, and the backboned animals such as fish, amphibians, reptiles, birds, and mammals.