Cycloplectoceras Ulrich, Foerste, Miller & Furnish 1942
- Dataset
- Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
- Rank
- GENUS
Classification
- phylum
- Mollusca
- class
- Cephalopoda
- order
- Tetrabranchia
- family
- Tarphyceratidae
- genus
- Cycloplectoceras
diagnosis
Diagnosis Small discoidal conch with nearly circular whorls in cross section; whorls are in contact and slightly impressed dorsally; extremely small umbilical perforation; surface ornamented with strong annulations and prominent growth lines, which form v-shaped ventral sinuses; sutures simple and nearly straight; siphuncle near the ventral wall of the conch (from Ulrich et al. 1942).
type_taxon
Type species Cycloplectoceras miseri Ulrich, Foerste, Miller & Furnish, 1942, from the Smithville Formation (Floian Stage), north of Smithville, Lawrence County, Arkansas, USA; by original designation.