Striatocycloceras Kröger & Isakar, 2006

Kröger, Björn, 2013, The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden, European Journal of Taxonomy 41, pp. 1-110 : 25

Genus Striatocycloceras Kröger & Isakar, 2006

Type species

Orthoceras undulostriatum Hall, 1847 from the Trenton Formation, late Katian of Middleville, New York, USA.

Diagnosis

Slender, circular or slightly compressed orthocones 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.

Remarks

The captions of the figures of the species of Striatocycloceras in Kröger & Isakar (2006) are erroneous and misleading. The errors must be corrected as follows: Striatocycloceras obliquum ( Teichert, 1930) is figured in Kröger & Isakar (2006: figs 7k, o, 8d, 11), as correctly stated in the text, and Striatocycloceras undulostriatum ( Hall, 1847) is also correctly figured ( Kröger & Isakar 2006: figs 7l 8e, 10a); other species shown are Striatocycloceras romingeri ( Foerste, 1932) ( Kröger & Isakar 2006: figs 7p, 8r-t) and Striatocycloceras foerstei ( Teichert, 1930) Kröger & Isakar (2006 : figs 7q, 10h).

Comparison

Striatocycloceras is similar in ornamentation and conch shape to the dawsonoceratid Anaspyroceras Shimizu & Obata, 1935 , which differs in having short, nearly achoanitic septal necks.