掘足纲

温暖海洋中的头足类软体动物，雌性有精致的象纸一样的螺旋状壳。由两边对称的海洋掘足纲软体动物组成的一个小纲。

Cephalopod mollusk of warm seas whose females have delicate papery spiral shells . small class of bilaterally symmetrical marine forms comprising the tooth shells .

由两边对称的海洋掘足纲软体动物组成的一个小纲。南美洲无尾的两栖类啮齿动物，体型大小如猪，部分蹼足；最大的现存啮齿动物。

Small class of bilaterally symmetrical marine forms comprising the tooth shells . pig-sized tailless South American amphibious rodent with partly webbed feet ; largest living rodent .