Fig. 9
From: Gymnodiadema and the Jurassic roots of the Arbacioida (stirodont echinoids)
a Strict consensus of the two equally parsimonious trees of length 32.53 derived from the 29-taxa and 31-character matrix given in the appendix after reweighting characters by their maximum retention index. b Strict consensus of the 35 trees, length 82 steps, consistency index of 0.49, a retention index of 0.77 and a rescaled consistency index of 0.38, obtained from analysis of the equal-weighted data matrix