Fig. 2.

Phylogenetic mapping of reproductive character states. Variation in sperm and stylet morphology, mating behavior, and female antrum morphology among 16 species in the genus Macrostomum. (Details on character states are given in Table S1.) The character states are mapped on the maximum-likelihood tree of the genus (complete ssrDNA and partial lsrDNA), and nodes marked with a circle have Bayesian posterior probability >0.95 and maximum-likelihood bootstrap support of >70%. (A detailed tree with outgroups and exact nodal support values is given in Fig. S1.) Note that the stylet of Macrostomum tuba is depicted at one-third of the original size.