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Chiroteuthis imperator by Carl Chun (copyright expired)
Originally published in: Pfeffer, G. 1912. Die Cephalopoden der Plankton-Expedition. Zugleich eine Monographische Übersicht der Oegopsiden Cephalopoden. Ergebniss der Plankton- Expedition der Humboldt-Stiftung, 2:1-815.
Source: Lane, F.W. Kingdom of the Octopus. Jarrolds Publishers (London) Ltd, plate 25.
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