Published December 31, 2007
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Fig. 4 in Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts (Late Ordovician) of Porkuni, Estonia
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Fig. 4. Polished median sections of cephalopods of the Siuge Member of Porkuni, Estonia. A. Eriditidae gen. et spec. indet, TUG 101/66a, detail of a siphuncular segment showing the annular endosiphuncular deposits. B. Orthoceratidae gen. et spec. indet. A, TUG 1227/1. C. Parvihebetoceras wahli sp. nov., TUG 1227/10, note the asymmetrical development of the siphuncular necks. D. Pomerantsoceras tibia spec. nov. 1227/45, fragment of apical part. +
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