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the grandmother hypothesis…

After some research into the surprisingly obscure role of the ammonite aptychus and some very helpful feedback from Robert Lemanis. So, apparently, aptychus are homologous to the lower beak in squids and octopuses. In ammonites, they are suspiciously similar in size and shape to the shell opening on ammonites they’ve been found with. The vision of a creature pushing it’s jaw out and up over it’s head made me think of a cute little grandma playing with her dentures, and so I began to call it the grandma hypothesis.  I know not everyone will like this interpretation of it’s function, but it should have at least one animated representation out there I think, and it definitely sets ammonites apart from nautiloids. So, we’ll see how the animation ends up looking…

I’ll also try to get a full list of references for this reconstruction up, but for the most part, it’s Christian Klug and researchers he’s worked with.