New Collegiate Dictionary

placoderm

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

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 — /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 — noun A member of an extinct group of fish with armored heads; the group lived during the Silurian and Devonian periods … Wiktionary

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
Coccosteina — Temporal range: Devonian Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum … Wikipedia

Dinichthyloidea — Temporal range: Late Silurian? to Late Devonian drawing of Dunkleosteus Scientific classification Kingdom … Wikipedia
Dicksonosteus — Temporal range: Early Devonian Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum … Wikipedia
Neophlyctaenius — Temporal range: Late Devonian Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum … Wikipedia