Published December 20, 2021 | Version v1
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Fig. 37 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities

  • 1. Finnish Museum of Natural History, University of Helsinki, PO Box 44, FI-00014 Helsinki, Finland.
  • 2. Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.

Description

Fig. 37. Longitudinal cross sections of protocycloceratid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Protocycloceras lamarcki (Billings, 1859). A. Specimen FMNH-P30418, approximal dorso-ventral median section with details of heavily recrystallized siphuncle and sepal necks, showing concave siphuncular segments. B. Specimen FMNH-30409, apical fragment of phragmocone with cameral deposits and siphuncle with concave segments and orthochoanitic septal necks. C. Protocycloceras minor sp. nov., FMNH-P30411, holotype, with poorly preserved details; siphuncle with nearly tubular segments and probably short orthochoanitic septal necks. Scale bar = 2 mm for all figures.

Notes

Published as part of Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783 (1) on page 55, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422

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