Fig. 3 in A unique late Eocene coleoid cephalopod Mississaepia from Mississippi, USA: New data on cuttlebone structure, and their phylogenetic implications

Fig. 3. Sepioid cephalopod Mississaepia mississippiensis Weaver, Dockery III, and Ciampaglio, 2010 (MGS 1948); late Eocene, Mississippi, USA. Median cuttlebone section to show loosely mineralized dorsal shield (bottom), small cup−like protoconch covered by thin layer of the dorsal shield (on the left) and curved hollow phragmocone exhibiting two long chambers and next short chambers; to the right from the last preserved (eighth?) septum inner surface of phragmocone is transversely ribbed. Abbreviations: dsh dorsal shield; p, protoconch; rr, ribbed relief of the inner surface of the phragmocone; 1s, 2s, 3s, 8s, first, second, third, eighth septa.