urotricha antarctica urotricha antarctica urotricha antarctica is a species of littoral ciliates, first found near king george island. urotricha antarctica scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: ciliophora class: prostomatea order: prostomatida family: urotrichidae genus: urotricha species: u. antarctica binomial name urotricha antarcticawilbert & song, 2008