Meet the spiny, ancient Fanjingshania renovatais—likely the oldest discovered fish ancestor with jaws.
, about 419.2 million and 358.9 million years ago when many different kinds of fishes began to swim Earth’s oceans.from any known modern or ancient vertebrate. Its has armor along its shoulders that fuse together as a unit that covers more area than other known acanthodians.
Its spiny fins were covered in unusual teeth-like scales, that possibly would fall out in clumps and regrow. Sharks living today also shed and regrow teeth, but aren’t replaced in this way.‘s fossilized bones show evidence of resorption, or when parts of bones or teeth break down and are later replaced. This process usually occurs during the organism’s development.
. “It speaks about greater than currently understood developmental plasticity of the mineralized skeleton at the onset of jawed fish diversification.”is one of several fossils that this same team uncovered at the Rongxi Formation site. The team describes another species of extinct jawed fish (
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