Figures

Figure 15.10   Echinoid classifi cation based mainly on cladistic analysis: 1, 10 ambulacral and 10 interambulacral areas; 2, upright lantern without foramen magnum; 3, distinctive perignathic girdle; 4, distinctive ambulacral areas; 5, upright lantern with deep foramen magnum; 6, grooved teeth; 7, stout teeth; 8, keeled teeth.

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