Update(April 2026):
Added files that bake actions and split them into separate animations(AnomalocarisAnimBakeSplit.zip, Blender4.5.1). This makes NLA editing easier.
https://eizouasobi.blogspot.com/2024/04/efficient-use-of-blender-assets.html

3D model and animations of Anomalocaris.

It contains two files.

Anomalocaris3.5 is from the old reconstruction .
Video footage is from Anomalocaris3.5.
AnomalocarisNew is of new reconstruction.

Anomalocaris3.5
AnomalocarisLowPoly:
3442Verts, 4190Faces
AnomalocarisMiddlePoly:
15263Verts, 15248Faces
AnomalocarisHighPoly:
60941Verts, 60912Faces

AnomalocarisNew
AnomalocarisLowPolyNew
6614Verts, 7614Faces
AnomalocarisHighPolyNew
111178Verts, 110900Faces
AnomalocarisHighPolyNewThickGill
116458Verts, 114042Faces

Animation names are listed in the documentation. 
https://www.youtube.com/watch?v=xzRg_zZrP3Q

Note: To import UE5, I need 3dsMax.
How to import to the game engine