Fig. 8
From: Convergent evolution of the sensory pits in and within flatworms
The ancestral state reconstruction of the presence of the sensory pit-like organs in flatworms. The tree topology was inferred based on a maximum-likelihood analysis of concatenated 18S, 28S, ITS-5.8S, and COI datasets (Additional file 2: Fig. S6). The pie charts show the likelihood of the character states at each node. Schematic drawings of the chosen representative flatworms show the position of their sensory pit-like organs (in red) in relation to the body outline (light gray) and gut (dark gray)