Look up: cephalaspis

1. 
   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 that ended in two points (it looked a bit like it had a boomerang in its head). Classification: Chordata, Vertebrata, Agnatha (Cyclostomata=jawless fish)...
   Found on http://www.enchantedlearning.com/subject
   
   
2. 
   Cephalaspis
   Ceph`a·las'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
   
   
3. 
   Cephalaspis
   `Cephalaspis` (`Head Shield`) was a genus of armored goldfish-sized to trout-sized detritivorous fish that lived in freshwater streams and estuaries of early Devonian Western Europe. Although it was heavily armored, this fish was an osteostracan cephalaspidomorph fish, and should not be confused with its jawed contemporaries, the placoderms.
   Found on http://en.wikipedia.org/wiki/Cephalaspis
   
   
4. 
   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
   
   
5. 
   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