|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Cephalopoda - Nautilida - Trigonoceratidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|S. Niko and R. H. Mapes 2007||Species of Epistroboceras with width/height ratios of 0.70–0.80 and umbilical angle strongly shifted to dorsum in adoral whorl; ratios of umbilical zone height to whorl height are small, 0.13–0.17; ventral platform wide; ventral (hyponomic) sinus V-shaped; siphuncle subventral with small position ratios (see the description for definition) of 0.13–0.15.|