This is just a quick bonus post associated with the original Anime Anthology entry on Hallucigenia Sparsa.
If you have not already done so, please read the theory here.
A parallel of Hallucigenia and Eren’s founding titan forming from chapter 123 of the Shingeki no Kyojin manga.

Hallucigenia walking, and the opening panel from Shingeki no Kyojin Ch 137 with Zeke’s narration about the creation of the universe.

There was also the scientific error of a fluid being mistaken for a part of Hallucigenia’s body. I theorized in the original Anime Anthology post that this could be the basis of the ‘spinal fluid’ necessity for tian powers.

For our last similarity of the post: a somewhat weaker image of the spinal transformation in the Season 4 opening combined with a fossilized Hallucigenia.

Maybe this angle works better?
The little tail end of the fossil could be Eren’s stubby legs.

I’m not sure.
And…that’s about it for now.
I know that there are probably many more parallels, but I found these specific panels to be the most striking during my preliminary research.
Can you think of any other parallels or manga panels that might fit with current images available of Hallucigenia Sparsa?
I also have a sort of ‘study guide’ coming soon with more resources related to Hallucigenia, and its relationship to the Attack on Titan series.
I’m going to be continuing on the AA series with Attack on Titan and other anime, so if you found this interesting consider becoming a Patron on Patreon.
Your support will help me purchase more books, historical documents, and conduct the research necessary to keep this series going.
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Until next time ~
☆ In Asian Spaces