Echinolampas [Planilampas] sternopatela Agassiz & Clark, 1907. Recent, Sagami Bay, Japan. From M. Shigei. 1986. The sea urchins of Sagami Bay. Biological Laboratory, Imperial Household, Maruzen Co. Ltd, Japan, 173 pp. 126 pls (plate 98, fig. 3). Oral view.
Length of test 56 mm.