Cephalopoda - Ammonitida - Sphenodiscidae
Alternative combination: Ammonites pleurisepta
Belongs to Sphenodiscus according to N. H. Landman and W. A. Cobban 2003
See also Böse 1928, Hyatt 1903, Kennedy et al. 1997, Kennedy et al. 1996 and Reyment 1955
Sister taxa: Sphenodiscus aberrans, Sphenodiscus beecheri, Sphenodiscus binkhorsti, Sphenodiscus brasiliensis, Sphenodiscus corroyi, Sphenodiscus intermedius, Sphenodiscus konincki, Sphenodiscus lobatus, Sphenodiscus parahybensis, Sphenodiscus prepleurisepta, Sphenodiscus siva, Sphenodiscus stantoni, Sphenodiscus ubaghsi
Average measurements (in mm): shell diameter 106.0
Distribution:
• Cretaceous of Mexico (2 collections), United States (59: Alabama, Colorado, Maryland, Mississippi, Missouri, South Dakota, Texas, Wyoming)
Total: 61 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.