colliniidae colliniidae colliniidae is a family of ciliates of the order apostomatida. colliniidae sem image of collinia sp., which can cause mass mortality in affected krill populations scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: ciliophora class: oligohymenophorea order: apostomatida family: colliniidae genera pseudocollinia collinia