placoderms
美英
- 网络盾皮鱼；盾皮鱼类
复数：placoderms
placodermsplacoderms
1.an extinct animal resembling a fish that was covered with bony plates and lived in the Paleozoic era.
placoderms复数：placoderms
placoderms1.an extinct animal resembling a fish that was covered with bony plates and lived in the Paleozoic era.