Crassigyrinus scoticus was a large aquatic predator known from the lower- to mid-Carboniferous period of Scotland and Canada. 3D reconstruction of the skull of Crassigyrinus scoticus; individual bones shown in different colors. Scale bars – 1 cm. Image credit: Porro et al., doi: 10.1080/02724634.2023.2183134. Crassigyrinus scoticus lived in coal swamps of what is now Scotland and Canada during the Carboniferous period, between 350 and 330 million...
