Trematode-host
Guides
Orchestia grillus
beach hopper, saltmarsh amphipod
Orchestia grillus is a saltmarsh amphipod in the family Talitridae, found in South America. It is notable for its role in studies of parasite-manipulated behavior, specifically involving infection by the trematode Levinseniella byrdi. Infected individuals display bright orange coloration and altered habitat use compared to uninfected individuals. The species is currently recognized as a synonym of Speziorchestia grillus in some taxonomic databases.