parameciidae parameciidae parameciidae is a family of ciliates in the order peniculida. members of this family have differentiated anterior and posterior regions and are bounded by a hard but elastic pellicle. the family contains the genera paramecium and physanter. parameciidae paramecium aurelia scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: ciliophora class: oligohymenophorea order: peniculida family: parameciidaedujardin 1840 genera paramecium müller, 1773 physanter jankowski, 1975