Modern decapods of the Chaceon genus are known as deep-water crabs and are distributed worldwide (Pinho et al., 2001). Modern decapods are known to exhibit visible trends in claw, carapace, and leg morphology with respect to their environment and predatory behaviors (Silva et. al., 2017). Schenk and Wainwright (2000) noted a correlation between the function and diet of the decapod claw. However, little research has been published on ancient decapods of the Chaceon genus. Comparing the physical characteristics of the ancient Chaceon specimens with modern specimens could provide insight on their habitat, diet, and evolution. The hypothesis was that ancient and modern species of the Chaceon genus would be morphologically similar but exhibit differences in claw, carapace, and leg morphology. In comparison of the carapace of both the ancient and modern specimens, the ancient specimens exhibited less proportion than the modern specimens which exhibited strong proportion. The mean claw length of the ancient specimen was significantly shorter than the mean claw length of the modern specimen. Results indicated this species displayed significant morphological variations in both their carapace and claw dimensions. The results provided evidence that these decapods most likely fed on different types of prey (Silva et. al., 2017). The differences in claw and carapace morphology between ancient and modern species provides key insight into the dietary habits of the Chaceon genus, indicating different lifestyles in different environments. In future analysis of this genus one could measure leg length in order to better understand the environmental differences between the two species.