A checklist of ciliates (Ciliophora) inhabiting on cnidarians Author Chatterjee, Tapas Near Harimandir Road, Dhanbad 826001, Jharkhand, India. Author Dovgal, Igor A. O. Kovalevsky Institute of Biology of the Southern Seas of Russian Academy of Sciences, 2, Nakhimov ave., Sevastopol, 299011, Russia. Author Fernandez-Leborans, Gregorio Department of Biodiversity, Ecology and Evolution, Facultad de Biología, Universidad Complutense de Madrid, C / José Antonio Novais, 12, 28040, Madrid, Spain. text Zootaxa 2021 2021-09-15 5039 2 151 178 journal article 10.11646/zootaxa.5039.2.1 1175-5326 5508963 C2B00051-A562-4FCA-83D5-DE284D0D90CE Ophryodendron abietinum Claparède & Lachmann, 1859 Record as epibiont on cnidarians: This species was reported as epibiont on polyparies of Sertularia , Plumularia and other hydrozoans from the coast of Norway ( Claparède & Lachmann 1859 ). Hincks (1873) reported this species on hydroid Halecium halecinum Linnaeus, 1758 from Menai Straits near Bangor, Devonshire, UK . It was also found on hydroids Obelia commissuralis and O. geniculata from Woods Hole, USA ( Root 1922 ). Recently it has been found on the colonies of hydroid polyp O. longissima (Pallas, 1766) in the White Sea ( Belokon et al . 2020 ; Khabibulina et al. 2021 ). Remarks: The species was found on cnidarians only and has not been recorded on any other host.