根足虫亚纲的一种原生动物，例如变形虫或放射虫目的根足虫，以通过伪足方式移动并摄取食物为特征。
A protozoan of the phylum Rhizopoda , such as an amoeba or a radiolarian , characteristically moving and taking in food by means of pseudopods .
根足虫