Fig. 9
From: Early cephalopod evolution clarified through Bayesian phylogenetic inference
Simplified cladogram of early Paleozoic cephalopods. Colored names at the top and boxes represent subclasses, and other names are on order level. Dashed lines represent paraphyletic groups. The evolution of connecting ring type (circles) and muscle attachments (squares) is plotted on the tree. Note that this figure represents a simplification and some exceptions from these patterns occur. Drawings of soft parts are speculative and shell proportions not to scale. Orientations do not necessarily represent assumed positions during life