Anatomy and evolution of the first Coleoidea in the Carboniferous

  title={Anatomy and evolution of the first Coleoidea in the Carboniferous},
  author={Christian Klug and Neil H. Landman and Dirk Fuchs and Royal H. Mapes and Alexander Pohle and Pierre Gu{\'e}riau and Solenn Reguer and Ren{\'e} Hoffmann},
  journal={Communications Biology},
Coleoidea (squids and octopuses) comprise all crown group cephalopods except the Nautilida. Coleoids are characterized by internal shell (endocochleate), ink sac and arm hooks, while nautilids lack an ink sac, arm hooks, suckers, and have an external conch (ectocochleate). Differentiating between straight conical conchs (orthocones) of Palaeozoic Coleoidea and other ectocochleates is only possible when rostrum (shell covering the chambered phragmocone) and body chamber are preserved. Here, we… 
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