Song & Wilbert 1997. Morphological studies on some free living ciliates (Cilophora: Heterotrichida, Hypotrichida) from marine biotopes in Qingdao, China, with description of three new species: Holosticha warreni nov. spec., Tachysoma ovata nov. spec, and T. dragescoi nov. spec. European Journal of Protistology, 33(1), January 31 1997: 48-62