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Chalk Billiard-room insect
白垩球房虫
生活在六千七百万年前(白垩纪)的海洋里,单细胞动物。形状似球,有许多个粘合在一起。壳上除一个开口处,还有许多小孔。它的根状伪足,从壳口和小孔伸出。