Figure 3From: Opisthobranchia (Mollusca, Gastropoda) – more than just slimy slugs. Shell reduction and its implications on defence and foragingPhylogeny of Opisthobranchia. Cladogram based on morphological data. Grey arrows indicate internalisation, black arrows the loss, of the shell. Positions of Acteonoidea, Tylodinoidea and Acochlidacea are marked by bold lines, because they differ from those on the gene-based tree (Fig. 4)Back to article page