Doryaspis nathorsti, primitive jawless fish Pteranodon Most sharks had at least

Most sharks had at least six rows of teeth

It was not a dinosaur

(Cro-Magnon) I Skull

specimens were discovered in southern Africa during the next twenty years that Australopithecus africanus began to gain acceptance in the established scientific community

The density of specimens in the Aspidella beds suggests levels of benthic biomass in the Neoproterozoic that could rival those of modern marine communities

Doryaspis nathorsti, primitive jawless fish Pteranodon Most sharks had at leastDoryaspis ("Dart Shield") (also known by its synonym, "Lyktaspis") is an extinct genus of primitive jawless fish that lived in the Devonian period. Fossils have been discovered in Spitsbergen. The animals had a canteen shaped body armor, and had large branchial plates that extended out and curved downward in a triangular shape, very similar to those of the pycnosteids. An element of the median oral plates (that would correspond to the lower lip or