• [Wiki] https://en.wikipedia.org/wiki/Psammechinus_miliaris.
• [BIOTIC] http://www.marlin.ac.uk/biotic/browse.php?sp=4134.
• [EoL] http://eol.org/pages/599663/overview.
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• [Zeut1955] Zeuten, E. (1955). Mitotic respiratory rhythms in single eggs of Psammechinus miliaris and of Ciona intestinalis. The Biological Bulletin, 108(3):366--385.