Schiaparelli S, Cattaneo-Vietti R, Mierzejewski P (2004) A “protective shell” around the larval cocoon of Cephalodiscus densus Andersson, 1907 (Graptolithoidea, Hemichordata). Polar Biology 27: 813-817.
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Schiaparelli, S.; Cattaneo-vietti, R.; Mierzejewski, P.
2004
A “protective shell” around the larval cocoon of Cephalodiscus densus Andersson