ostracoderm

NOUN
  1. extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic
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How To Use ostracoderm In A Sentence

  • Enamel, or enameloid tissue covering tubercles, was clearly described in Ordovician vertebrates such as the ostracoderms.
  • 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.
  • [[ostracoderm]] s jawless fish related to present-day [[lamprey]] s and Conservapedia - Recent changes [en]
  • 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).
  • 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).
  • The oldest fossil related to all modern vertebrates, the ostracoderm a jawless, bony-plated fish, dates to about 490 million years ago. Trout and Salmon of North America
  • [[ostracoderm]] s jawless fish related to present-day [[lamprey]] Conservapedia - Recent changes [en]
  • 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.
  • 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.
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