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

ostracoderm

/ɒˈstrakədəːm

noun

An early jawless fossil fish of the Cambrian to Devonian periods, having a heavily armoured body.

Class Agnatha: several orders.

By the Middle Devonian the armoured jawless ostracoderms were in decline, and instead the jawed fish were undergoing a great evolutionary radiation in both the sea and in freshwater....

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).
These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi.

Origin

Late 19th century: from modern Latin Ostracodermi (former taxonomic name), from Greek ostrakon 'shell' + derma 'skin'.

单词	ostracoderm
释义	ostracoderm /ɒˈstrakədəːm / noun An early jawless fossil fish of the Cambrian to Devonian periods, having a heavily armoured body. Class Agnatha: several orders. By the Middle Devonian the armoured jawless ostracoderms were in decline, and instead the jawed fish were undergoing a great evolutionary radiation in both the sea and in freshwater.... 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). These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi. Origin Late 19th century: from modern Latin Ostracodermi (former taxonomic name), from Greek ostrakon 'shell' + derma 'skin'.
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