ZME Science reports [zmescience.com] on a Nature article [nature.com] (full article is paywalled) about a disease called disseminated neoplasia. The disease is a group of cancers which are thought to spread via seawater. They affect mussels, cockles [wikipedia.org], and golden carpet shell clams [museumwales.ac.uk].
Among mussels and cockles, the cancer cells come from the same species, but the cancer infecting golden carpet shell clams comes from a different species, Venerupis corrugata [wikipedia.org], the pullet carpet shell.