fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws
例句
The team later discovered a placoderm of a different species but similar date, with three smaller embryos inside it. “你们用我的名字命名如此神奇的生物，我感到万分荣幸，”艾登堡爵士向澳大利亚的古生物学家们表示。
It is a new species of placoderm, the type of armour-plated fish that dominated the Devonian oceans for 70m years. 它是盾皮鱼中的新种类。盾皮鱼身上覆有盔甲，统治泥盆纪海洋达7000万年。
Some male placoderm fossils show evidence of “graspers” that held the female fish during copulation. 一些雄性盾皮鱼化石显示出在交配期间用来抓住雌鱼的“紧握器”的证据。
” Some male placoderm fossils show evidence of “graspers” that held the female fish during copulation. 一些雄性盾皮鱼化石显示出在交配期间用来抓住雌鱼的“紧握器”的证据。
