Based on [Segozancia sp. male crab (Crab C)](https://skfb.ly/o66tV) by [TheRLab](https://sketchfab.com/therlab) is licensed under [Creative Commons Attribution](http://creativecommons.org/licenses/by/4.0/).
I used default "triangle target" settings in the InstaLOD for Blender set up of https://instalod.com/ to optimise this mesh.