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1 December 2010 Reevaluation of the Late Carboniferous Cephalopod, Brachycycloceras? Spectrum Hansman, 1965 from Texas, USA
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Abstract

New material of the Virgilian (Upper Carboniferous) nautiloid cephalopod Brachycycloceras? spectrum Hansman, 1965, from the Necessity Shale and the Finis Shale (the type stratum of this species) members of the Graham Formation in Texas, has prompted a reevaluation of this insufficiently described species. On the basis of morphologic differences between the present material and Brachycycloceras normale Miller, Dunbar and Condra, 1933, the type species of the genus, the species is transferred from its previous placement with reservation to the orthoceratid genus Cryptocycloceras Shimansky, 1968 as C. spectrum (Hansman, 1965). Specimens of Cryptocycloceras have been recovered from Russia, and an older, related genus Hidamichelinoceras Niko, 2000 has been recovered in Japan.

© by the Palaeontological Society of Japan
Shuji Niko and ROYAL H. MAPES "Reevaluation of the Late Carboniferous Cephalopod, Brachycycloceras? Spectrum Hansman, 1965 from Texas, USA," Paleontological Research 14(4), 227-232, (1 December 2010). https://doi.org/10.2517/1342-8144-14.4.227
Received: 18 April 2010; Accepted: 1 September 2010; Published: 1 December 2010
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