Share this entry

Share this page

ostracoderm

Syllabification: os·tra·co·derm
Pronunciation: /ˈästrəkōˌdərm
 
/

Definition of ostracoderm in English:

noun

An extinct jawless fish of the Cambrian to Devonian periods, having a heavily armored body.
  • Class Agnatha: several orders
Example sentences
  • 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'.

Definition of ostracoderm in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day snarf
Pronunciation: snɑːf
verb
eat or drink quickly or greedily