The invasive round goby Apollonia melanostoma (Actinopterygii: Gobiidae) – a new intermediate host of the trematode Neochasmus umbellus (Trematoda: Cryptogonimidae) in Lake Erie, Ohio, USA.

The article discusses the invasive round goby Apollonia melanostoma Trematodes. Four species comprise this genus in North American waters. N. umbellus is the sole species that has been described to parasitize fishes in Lake Erie of the Great Lakes. The metacercariae of N. umbellus are located in the muscles of relatively small-sized fishes. The skin, fins, gills, muscles, brain, eyes, gut, liver, spleen, kidneys, body cavity, and mesentery were examined for metazoan parasites. The metacercariae were first isolated from cysts. Parasite