Striatocycloceras undulostriatum (Hall, 1847)

Taxon description

Kröger & Isakar, 2006

Diagnosis. Slightly curved, slightly compressedStriatocy-cloceraswith very low apical angle of approximately 2.Adult dorsoventral diameter approximately more than30 mm, with four to six annulations at a distance that equatesthe corresponding shell diameter in adult. Annulationsslightly oblique, irregularly spaced, with faint lobe at the sidein opposition of the siphuncle. Distinct growth lines, 10––12per cycle of annulations, one or two cycles of annulations perchamber. Suture lines run slightly oblique in relation to an-nulations forming a slight sinus at the side opposite to thesiphuncle. Siphuncle subcentral. Short, orthochoanitic septalneck

Type specimen data
AMNH 804 ,
Synonymy list
1847     Orthoceras undulostriatum — Hall, pp. 202, fig. 43:7
1850     Orthoceratites undulostriatum — dOrbigny, pp. 3
1858     Orthoceratites undulostriatum — Salter, pp. 375, fig. Pl. 13:25,26
1915     Orthoceratites undulostriatum — Bassler, pp. 918
1932     Cycloceras undulostriatum — Foerste, pp. 87, fig. Fig: 12:3-4
2006     Striatocycloceras undulostriatum (Hall, 1847) — Kröger & Isakar, pp. 150, fig. 7L, 8E, 10A
2012     Striatocycloceras undulostriatum (Hall, 1847) — Kröger, pp. 25
Selection of related publications
Kröger, B. & Aubrechtová, M. 2018. Cephalopods from reef limestone of the Vasalemma Formation, northern Estonia (latest Sandbian, Upper Ordovician) and the establishment of a local warm-water fauna. Journal of Systematic Palaeontology 16, 10, 799-839. DOI:10.1080/14772019.2017.1347212
Kröger, B. & Isakar, M. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9, 1, 137-163. DOI:10.1002/mmng.200600005
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloididest. Diplomitöö; 16 fototahvlit, materjali nimekiri Stumburi tööde kaustas, pp. 1-159.
References based on distribution