“…A total of 4 species, i.e., C. dominicana , C. jejuna , C. lingua and C. thapari , were described as the linguiform species [ 6 , 10 – 15 ]. As the pentagonal or ovoid form species, more than 9 ones, i.e., C. concava , C. cryptocotyloides , C. quinqueangularis , C. badamshini , C. delamurei , C. misgurni , C. gyrinicola , C. yamashitai and C. lata , were recorded in the literatures [ 5 , 8 , 10 , 15 – 24 ].…”