Contributed by Andreas Kroh, November 2011
| Classification and/or Status | error pro Amphidetus L. Agassiz, 1836, p. 184 = Echinocardium Gray, 1825, p. 430. |
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| Remarks | Robertson, D. 1871. Notes on Amphidotus cordatus (Penn). Quarterly Journal of Microscopical Science, New Series 11, 25-27. |