
Mad science boy making evil science memes, drawings, and entertraining science articles. Find those on my website-inator https://ravingsofamadscientist.com/ I love science!
287 posts
This Shark Evolved To Have Two Mouths.
This shark evolved to have two mouths.

That’s right, Slifer the Sky Dragon’s silly looking double mouths are totally scientifically accurate. Based on limited archeological evidence of a long extinct weirdo shark. Oh yeah, and it was roughly 2 meters (6'7") long. So that's fun.
Metopacanthus granulatus is a Chimaera, a group of cartilaginous fish distantly related to sharks and rays. Unlike a shark’s rows of teeth, chimaeras have very distinctive mouths with just a few beak-like tooth plates. So maybe the second mouth evolved to be better at catching fish than what the true mouth would be capable of? I guess? Why not just change the main mouth? I want whatever evolution was smoking when it made this.
The "teeth" of the secondary mouth thingy (I don't even know what to call it) are actually just modified dermal denticles, which are the shark equivalent of scales. But shark denticles are made of tooth enamel instead of keratin. So modifying them into teeth is pretty straight forward. In fact, all teeth likely evolved from modified denticles or scales. Its secondary mouth thingy is so primitive and simplistic that the very first jaws (pun unintended) to ever evolve probably looked a lot like it.
Anyways, I think a trap door leading to a tank of these guys would be a great addition to any laboratory's decor. That's twice the biting action for half as many sharks!

Here are my sources. Unfortunately all the good papers for the extinct Metopacanthus granulatus are in German, so beyond the knowledge of mortal men. If anyone has a translation of the primary German papers on the topic, or is able and willing to translate it, I would be interested in seeing that.
https://en.wikipedia.org/wiki/Metopacanthus#cite_note-2
https://palaeopedia.tumblr.com/post/155290637858/the-metopacanthus-1837-phylum-chordata-class
http://palaeos.com/vertebrates/bones/dermal/mandibular-dentary.html
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