A-C. Orthoceras scabridum Angelin, 1880. A. Median section of a septal

Download scientific diagram | A-C. Orthoceras scabridum Angelin, 1880. A. Median section of a septal neck (sn) and connecting ring (conn); note that the calci− fied−perforate layer (cp) of the connecting ring is a direct continuation of the nacreous layer of the septal neck, × 50. B. Median section of a connecting ring to show the calcified−perforate layer (cp) with pores and the spherulitic− prismatic layer (sph), × 50. C. Tangential sec− tion of a connecting ring to show numerous, elongated pores in the calcified−perforate layer (cp), × 50. D, E. Rynchorthoceras sp. D. Tan− gential section of the calcified−perforate layer (cp) of the connecting ring to show numerous elongated pores, × 40. E. Transverse section of the calcified−perforate layer (cp) with numer− ous pores, × 40. from publication: Connecting ring structure and its significance for classification of the Orthoceratid Cephalopods | Mutvei, H. 2002. Connecting ring structure and its significance for classification of the orthoceratid cephalopods. Acta Palaeontologica Polonica 47 (1): 157–168. The connecting ring in orthoceratids is composed of two calcified layers: an outer spherulitic−prismatic and an | Connectivity, Classification and Structuralism | ResearchGate, the professional network for scientists.

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Harry MUTVEI, Swedish Museum of Natural History, Stockholm, Palaeozoology

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