The Echinoid Directory

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Winkleria maastrichtensis Engel, 1964; camera lucida drawings of ambulacrum and interambulcrum. From Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene Echinoids: a key to world faunas. Special Papers in Palaeontology 63, 1-404 (Text-fig. 48).