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1 Tree was published in this study

Testing the molecular clock: molecular and paleontological estimates of divergence times in the Echinoidea (Echinodermata).
Smith, Pisani, Mackenzie-Dodds, Stockley, Webster, Littlewood. (2006). Mol Biol Evol.
Pedinidae Aspidodiadematidae Diadematidae Arbaciidae Stomechinidae Echinometridae Echinidae Toxopneustidae Genocidaridae Temnopleuridae Echinolampadidae Cassidulidae Laganidae Fibulariidae Astriclypeidae Mellitidae Arachnoididae Schizasteridae Paleopneustidae Brissidae Archaeopneustes Spatangidae Loveniidae Plexechinidae Echinoneidae Echinothuriidae
0 60 120 180 243 Time (MYA)
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