Tetrahymena pyriformis (Ehrenberg, 1830)

Record as endobiont in Ostracods: This species was recorded in Tonnacypris lutaria (Koch, 1838) found between carapace lamellae and inside limb from Melenci—Bašaid, Danube basin in Serbia (Nikolić & Karan-Žnidaršič 2005).

Remarks: “ Tetrahymena pyriformis ” is a complex of at least 14 cryptic species, which can recognized using molecular approach (Lynn 2008). In such a situation, it is impossible to clarify what representative of family Tetrahymenidae was found in ostracode host.