Figure 2.

BEAST chronogram for a subset of Bdelloidea and Monogononta inferred using a concatenated alignment of both COI mtDNA and 18S rDNA. The substitution model GTR + Γ + I was found to be the best fit for both COI and 18S. A lognormal relaxed clock with separate substitution rates for COI (1.76% Myr⁻¹) and 18S (0.02% Myr⁻¹) were used. The posterior probability values are shown as clade support at the nodes. Images of Brachionus manjavacas (of the B. plicatilis species complex) and Adineta tuberculosa were taken by Diego Fontaneto and Giulio Melone.