Striatocycloceras Kroger & Isakar 2006

Genus Striatocycloceras Kröger & Isakar, 2006 Type species Orthoceras undulostriatum Hall, 1847 from Middleville, New York, USA, Trenton Formation, late Katian; by original designation. Diagnosis Slender orthocones with circular or slightly compressed conch cross section, with asymmetrically curved septa and straight transverse or slightly oblique sutures; sutures parallel, or nearly so, to the annulations; annulations slightly irregularly spaced, with fine transverse ornament; siphuncle eccentric, narrow, tubular, or slightly expanded within the chambers; septal necks orthochoanitic; cameral and endosiphuncular deposits not known. (Adopted from Kröger & Isakar 2006.) Comparison Anaspyroceras Shimizu & Obata, 1935 differs from Striatocycloceras in having a fine longitudinal ornamentation. Leurocycloceras Foerste, 1928a is similarly ornamented to Striatocycloceras but differs in having long septal necks.