合湖圆田螺，软体动物门-腹足纲-中腹足目-田螺科。New species could be distinguished from other congeners of chinensis group by shell without color bands vs. with color band in C. ussuriensis; vas deferens opens in last 1/4 of testis vs. 1/3 of tesitis in C. chinensis and C. c. fl uminalis ; vas deferens with 5–6 branches vs. 8–9 in C. haasi . Additionally, the character of osphradium long, about two times the length from the anterior of osphradium to mantle edge could be distinguished from other species of Ciapangopaludina.