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placoderm

placoderm
A member of an extinct group of fish with armored heads; the group lived during the Silurian and Devonian periods.

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  • Placoderm — Plac o*derm, n. [Gr. pla x, plako s, tablet + de rma skin.] (Paleon.) One of the Placodermi. [1913 Webster] …   The Collaborative International Dictionary of English

  • placoderm — noun Etymology: New Latin Placodermi, ultimately from Greek plak , plax + derma skin more at derm Date: circa 1865 any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures …   New Collegiate Dictionary

  • placoderm — /plak euh derrm /, n. any of various extinct jawed fishes of the class Placodermi, dominant in seas and rivers during the Devonian Period and characterized by bony armored plates on the head and upper trunk. [1855 60; < NL Placodermi name of the… …   Universalium

  • placoderm — мед.сущ. плакодерма …   Англо-русский медицинский словарь

  • Placodermi — Taxobox name = Placodermi fossil range = fossil range|430|360Early/Mid Silurian – Late Devonian image width = 200px image caption = Dunkleosteus attacking Gorgonichthys regnum = Animalia phylum = Chordata subphylum = Vertebrata infraphylum =… …   Wikipedia

  • Acanthothoraci — Taxobox name = Acanthothoraci fossil range = Silurian? Early Devonian image caption = Weejasperaspis gavini , Murrindalaspis wallacei Brindabellaspis stensioi regnum = Animalia phylum = Chordata subphylum = Vertebrata infraphylum = Gnathostomata… …   Wikipedia

  • Brindabellaspis — Taxobox name = Brindabellaspis stensioi fossil range = Silurian? Early Devonian status = Fossil regnum = Animalia phylum = Chordata subphylum = Vertebrata infraphylum = Gnathostomata classis = Placodermi classis authority = McCoy, 1848 ordo =… …   Wikipedia

  • fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with …   Universalium

  • Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… …   Universalium

  • Ctenurella — Temporal range: Late Devonian …   Wikipedia