The Echinoid Directory

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Asthenosoma varium Grube, 1868. Recent. ambulacral plating and apical disc in juvenile (left-hand side) and adult (right-hand side). From Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen (figs 153, 154).