An unusual sporozoan blood parasite, named Haematractidium scombri Henry, 1910,  from the Atlantic mackerel, Scomber scombrus.
D000818:Animals; D016782:Apicomplexa / Q000145:classification*; D001769:Blood / Q000469:parasitology; D005393:Fish Diseases / Q000469:parasitology*; D005399:Fishes / Q000469:parasitology*