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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
