This is Mazon Monday post #12.
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This video by the Field Museum details some of the modern research methods used to study the Tully Monster fossils, and actually many of the other fossils in the FM collection. This research led to the conclusions that you have heard a few years ago... the Tully Monster is a vertebrate. That result was reiterated back in March 2020 with another paper in the journal Nature.
Tully: Monster vs Method from Field Museum on Vimeo.