Thecamoebians (Testate Amoebae) Straddling the Permian-Triassic Boundary in the Guryul Ravine Section, India: Evolutionary and Palaeoecological Implications. oleh Vartika Singh, Sundeep K Pandita, Rajni Tewari, Peter J van Hengstum, Suresh S K Pillai, Deepa Agnihotri, Kamlesh Kumar, G D Bhat