[1] The body has a yellow to tan color and has one dark dorsal stripe that does not extend over the head.

[4] After finding an earthworm, the planarian quickly crawls over it and wraps itself around the prey, preventing its escape.

[5] In North America, where B. adventitium is an introduced species, most earthworms do not immediately recognize the flatworm as a predator.

They try to escape only after being pierced by the planarian's everted pharynx, which is one of the reasons of B. adventitium's success in invading this continent.

It is believed that this broadhead planarian was introduced and spread to most Northern states passively by human dispersal and has become abundant in the region it occupies.