Trocholitoceras Hyatt 1894
- Dataset
- Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
- Rank
- GENUS
Classification
- phylum
- Mollusca
- class
- Cephalopoda
- order
- Tarphycerida
- family
- Trocholitidae
- genus
- Trocholitoceras
diagnosis
Diagnosis Moderately large, subdiscoidal, involute conchs with a ca 180 ° long body chamber; umbilical perforation very small; ornamented with prominent, partly fasciculate growth lines and low ribs which form a deep rounded ventral sinus; sutures directly transverse and nearly straight except on dorsal side where they form a shallow lobe; siphuncle small, subcentral during early adolescence, dorsal or nearly so at maturity (from Ulrich et al. 1942: 80).
type_taxon
Type species Trocholitoceras walcotti Hyatt, 1894, from the Fort Cassin Limestone (late Floian Stage), Fort Cassin, Addison County, Vermont, USA; by original designation.
Name
- Homonyms
- Trocholitoceras Hyatt 1894