Definition of ostracoderm in English:

ostracoderm

noun ɒˈstrakədəːmˈästrəkōˌdərm

An early jawless fossil fish of the Cambrian to Devonian periods, having a heavily armoured body.
Class Agnatha: several orders
Example sentencesExamples
- These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi.
- 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).
- If lancelets and the fossil ostracoderms are considered out-groups to living craniates, then the brains of the earliest craniates must have been very small for their body size.
- Enamel, or enameloid tissue covering tubercles, was clearly described in Ordovician vertebrates such as the ostracoderms.

Origin

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

Definition of ostracoderm in US English:

ostracoderm

nounˈästrəkōˌdərm

An extinct jawless fish of the Cambrian to Devonian periods, having a heavily armored body.
Class Agnatha: several orders
Example sentencesExamples
- 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).
- Enamel, or enameloid tissue covering tubercles, was clearly described in Ordovician vertebrates such as the ostracoderms.
- These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi.
- If lancelets and the fossil ostracoderms are considered out-groups to living craniates, then the brains of the earliest craniates must have been very small for their body size.

Origin

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

单词	ostracoderm
释义	Definition of ostracoderm in English: ostracoderm noun ɒˈstrakədəːmˈästrəkōˌdərm An early jawless fossil fish of the Cambrian to Devonian periods, having a heavily armoured body. Class Agnatha: several orders Example sentencesExamples These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi. 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). If lancelets and the fossil ostracoderms are considered out-groups to living craniates, then the brains of the earliest craniates must have been very small for their body size. Enamel, or enameloid tissue covering tubercles, was clearly described in Ordovician vertebrates such as the ostracoderms. Origin Late 19th century: from modern Latin Ostracodermi (former taxonomic name), from Greek ostrakon 'shell' + derma 'skin'. Definition of ostracoderm in US English: ostracoderm nounˈästrəkōˌdərm An extinct jawless fish of the Cambrian to Devonian periods, having a heavily armored body. Class Agnatha: several orders Example sentencesExamples 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). Enamel, or enameloid tissue covering tubercles, was clearly described in Ordovician vertebrates such as the ostracoderms. These were jawless, armored fish informally called ostracoderms, but more correctly placed in the taxon Pteraspidomorphi. If lancelets and the fossil ostracoderms are considered out-groups to living craniates, then the brains of the earliest craniates must have been very small for their body size. Origin Late 19th century: from modern Latin Ostracodermi (former taxonomic name), from Greek ostrakon ‘shell’ + derma ‘skin’.
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