Table 4. Ancestral state likelihood reconstruction (Mk model) for pelvic and pedal characters obtained from the Bayesian maximum clade credibility tree.

Clade	Ch. 89		Ch. 117		Ch. 123
	State 0	State 1	State 0	State 1	State 0	State 1
Mosasauridae	0.432	0.568	0.314	0.686	0.033	0.967
Clade B*	0.419	0.580	0.291	0.709	?	?

Proportional ancestral state likelihoods (using Mk model) for the three main mosasauroid clades. Characters 89 and 117 relate to pelvic and 123 to pedal morphologies. State “0” is associated with plesiopelvic/pedal conditions and state “1”with hydropelvic/pedal conditions.

* Clade B is chosen herein because the node from where this clade branches from is also the most recent ancestral node to tethysaurines, thus revealing the likelihood in the most recent common ancestor for that clade.

? Indicate ambiguous likelihoods that could not be calculated.