Histopathological survey of parasites harboured by the clam Tawera elliptica (Lamarck, 1818) from Chiloé Archipelago, southeastern Pacific

•Most relevant findings from 374 Tawera elliptica clams examined were intracellular microcolonies of bacteria (IMC) in digestive gland and intestine, and an intraoocytic microsporidian.•Scanning electron images of histological sections of IMC and the Steinhausia-like intraoocytic microsporidian.•No OIE listed pathogens detected.•No disease risks for the cultivation of this clam at actual prevalences and infection intensities.