Pteronisculus cicatrosus (Triassic Fish from Madagascar)
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Pteronisculus cicatrosus is an extinct Lower Triassic (247 million year old) fossil fish preserved inside of a concretion or nodule. These wonderfully preserved fish are found by cracking open the hard concretions, and show amazing detail such as scales and fins. There are about half a dozen different fish described from this location and this one is Pteronisculus cicatrosus. This specimen was cracked and prepped by yours-truly.