Thanks for your reply.
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*There are cases that depicts them in different forms besides hanging out of the peak. Hope this gives it some flexibility to the idea, maybe?
@Bernd
dsaid that could be water coming from the plant, that is convenient for this seahorse argument. (There are pictures of water coming from plants in other folios.)
*My strongest reasons to be a seahorse and not a dragon is the bump on the head, hinting an unicorn like feature. Also, Maybe the fingers don't represent claws like in a dragon, they could match fins. The retracted feathers or scaled wings also appear on proper dragons or basilisks too, so it could be a common shared element i guess.
*I'm clueless and lost on how to search for something similar. There may be, but if this was an unique take on the seahorse, we may not find another picture like that.
Maybe the author took some liberties based on the medieval believe of animals transforming in other animals at different stages of growth. There is another picture depicting a variant on this myth; 79v left bottom drawing:
The seahorse is the only reference have found so far about an animal born from a leaf because they appear usually from roots, like the root-snake @Bluetoes101 mention, or like the quadruped that has roots instead of a tail in that 79v picture. The 90v root is animal shaped.
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I wish to be better at proven or disproven this argument to be honest. This stuff took me some days. thanks for reading.
This is the best that i have on the matter tho.