英语词汇“placoderm”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

placoderm

/ˈplakə(ʊ)dəːm

noun

A fossil fish of the Devonian period, having the front part of the body encased in broad flat bony plates.

Class Placodermi: several orders.

Such giant cephalopods play or played a similar ecological role of top predator to that of Devonian arthrodire placoderms, Mesozoic pliosaurs and Cenozoic toothed whales....

During this period the agnathan and gnathostome fishes, too, gave rise to many distinctive groups: the armoured ostracoderm and placoderms, the bony fishes, and elasmobranchs to populate marine and freshwater environments.
With their armored head shield and trunk shield composed of overlapping bony plates, the placoderms appear at first glance extremely similar to the ostracoderms (armoured jawless fish).

Origin

Mid 19th century: from Greek plax, plak- 'flat plate' + derma 'skin'.

单词	placoderm
释义	placoderm /ˈplakə(ʊ)dəːm / noun A fossil fish of the Devonian period, having the front part of the body encased in broad flat bony plates. Class Placodermi: several orders. Such giant cephalopods play or played a similar ecological role of top predator to that of Devonian arthrodire placoderms, Mesozoic pliosaurs and Cenozoic toothed whales.... During this period the agnathan and gnathostome fishes, too, gave rise to many distinctive groups: the armoured ostracoderm and placoderms, the bony fishes, and elasmobranchs to populate marine and freshwater environments. With their armored head shield and trunk shield composed of overlapping bony plates, the placoderms appear at first glance extremely similar to the ostracoderms (armoured jawless fish). Origin Mid 19th century: from Greek plax, plak- 'flat plate' + derma 'skin'.
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