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1 Tree was published in this study

The geological history of deep-sea colonization by echinoids: roles of surface productivity and deep-water ventilation.
Smith and Stockley. (2005). Proc Biol Sci.
Brisaster fragilis Brisaster latifrons Abatus Amphipneustes Paleopneustes Agassizia Paraster Archaeopneustes Meoma Spatangus raschi Spatangus multispinus Echinocardium Lovenia Paramaretia Metalia nobilis Metalia spatagus Plagiobrissus Linopneustes Brissus obesus Brissus unicolor Brissopsis
0 30 60 90 101 Time (MYA)
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