With powerful shearing jaws and armoured faces that really stand out amongst other fish both of the time they were around and today, placoderms are some of the paleozoic's most iconic animals, and for good reason.

One of these animals is the very bizarre Alienacanthus, their name meaning alien spine, are animals that have recently undergone quite the drastic change in terms of how we perceive their appearance. First described in 1957 from remains found in Poland, and with more later described from Morocco, during the Late Devonian period, these localities were all submerged coastlines, and regions where animals like Alienacanthus could thrive.

Many of the fossils however were quite fragmentary and offered a limited detail on what they would have looked like in life, that is at least until now in 2024, where their "spines" were actually a part of a massive underbite. I hope you enjoy.

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Sources:
https://royalsocietypublishing.org/do...
https://www.nytimes.com/2024/01/30/sc...
https://en.wikipedia.org/wiki/Alienac...
https://fishlab.ucdavis.edu/category/...
https://pubmed.ncbi.nlm.nih.gov/2860672/
https://betterknowafish.com/2013/07/0...
https://www.app.pan.pl/archive/publis...

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