Cephalaspis

Cephalaspis meaning head shield) was a genus of primitive, jawless, armored, fresh-water fish that lived during the Silurian-Devonian periods (over 340 million years ago). Cephalaspis is the oldest known animal vertebrate (an animal having a backbone). This extinct group of fish were less than an foot long and had a large, flattened head shield tha
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Cephalaspis

Ceph`a┬Ělas'pis noun [ New Latin , from Greek kefalh` head + ... a shield.] (Paleon.) A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and protected by a broad shield-shaped helmet prolonged behind into two lateral points.
Found on http://www.encyclo.co.uk/webster/C/45

Cephalaspis

• (n.) A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and protected by a broad shield-shaped helmet prolonged behind into two lateral points.
Found on http://thinkexist.com/dictionary/meaning/cephalaspis/

Cephalaspis

extinct genus of very primitive jawless, fishlike vertebrates found in Early Devonian rocks (the Devonian Period lasted from 408 to 360 million ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/c/46

Cephalaspis

Cephalaspis (head shield) was a genus in the class Osteostraci of Palaeozoic armoured jawless fishes, or ostracoderms. It was a medium sized detritivorous fish that lived in freshwater streams and estuaries of the early Devonian. ==Anatomy and morphology== Like its immediate osteostracan ancestors, Cephalaspis was heavily armored, presumedly to de
Found on http://en.wikipedia.org/wiki/Cephalaspis
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