uronematidae uronematidae uronematidae is a family of ciliates in the order philasterida. uronematidae uronema nigricans scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: ciliophora class: oligohymenophorea order: philasterida family: uronematidaethompson, 1964 genera homalogastra urocyclon uronema uronemella uropedalium