Figure 3.

Cladogram of sharks to the family level based on the tree from Vélez-Zuazo & Agnarsson [32] (adapted from Leigh et al. [8]), depicting which spiral intestine morphology corresponds to each family. Light grey lines show which families belong to certain orders. (A) Column, (B) scroll, (C) funnels pointed posteriorly and (D) funnels pointed anteriorly. Most basal categories (prior to Selachimorpha) do not have CT scans. Information about spiral intestine structure came from the previous literature.