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.

Full article: Siphuncular structures in Calciosiphonate nautiloid orders Actinocerida, Orthocerida and Barrandeocerida (Cephalopoda)

PDF) Connecting ring structure and its significance for classification of the Orthoceratid Cephalopods

PDF) Connecting ring structure and its significance for classification of the Orthoceratid Cephalopods

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

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