Fig. 11 in A unique late Eocene coleoid cephalopod Mississaepia from Mississippi, USA: New data on cuttlebone structure, and their phylogenetic implications

Fig. 11. Cuttlebone of sepioid cephalopod Mississaepia mississippiensis Weaver, Dockery III, and Ciampaglio, 2010; late Eocene, Mississippi, USA (A–C) and contemporary Sepia (D). A. MGS 1956. B. MGS 1956. C. MGS 1956. D. NRM−PZ Mo. 180818. Photographs (A1−D1); EDS data on chemical composition shows presence of: A2, high content of nitrogen indicating organic ingredient in silicified tissue preserved along contact between conotheca and septum; B2, nitrogen indicating organic ingredient of phosphatised sheet within the dorsal shield; C2, D2, nitrogen indicating organic ingredient of dorsal shield.