Figure 1
From: Nematode eel parasite found inside acanthocephalan cysts - a "Trojan horse" strategy?
Hosts and parasites. a Opened up swim bladder of the European eel Anguilla anguilla showing a common number of adult blood sucking Anguillicoloides crassus, which can cause heavy infections and might hamper the 5000 km catadromous spawning migration to the Sargasso Sea; b The invasive round goby Neogobius melanostomus as prey organism in an opened up eel stomach; c Opened up acanthocephalan cyst (upper left) of Pomphorhynchus sp. (right), a highly abundant parasite of the goby, and third-stage larvae of A. crassus, isolated from the cyst (arrow); d Higher magnification of the L3 larvae of A. crassus.