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cephalaspids

Cephalaspidomorphi — Cephalaspidomorphs Reconstruction of Cephalaspis lyellii Scientific classification Kingdom … Wikipedia
Ostracoderm — Ostracoderms ( shell skinned ) are any of several groups of extinct, primitive, jawless fishes that were covered in an armor of bony plates. They belong to the taxon Ostracodermi, and their fossils are found in the Ordovician and Devonian Period… … Wikipedia
Cornuata — Temporal range: Early Silurian–Late Devonian … Wikipedia
Undichna — Taxobox color = #e0d0b0 name = Undichna image width = 240px image caption = fossil range = Silurian ? regnum = Animalia phylum = Chordata genus = Undichna (Ichnogenus) subdivision ranks = Species (Ichnospecies) subdivision = * Undichna bina… … Wikipedia
Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… … Universalium