Schistocephalus solidus (syn. S. gasterostei)
Greek: schisis = division; schizein = divide; kephale = head. Latin: solidus = solid.
In Northern hemisphere, since this parasite is bound to the occurrence of its intermediate fish host = stickleback (Gasterosteus aculeatus), which originally was a salt water fish, but became adapted to fresh water during the Pleistocene glacier period. This tapeworm is common in a broad spectrum of final hosts (coastbirds).