UK Ammonite Hoploscaphites IF-UKA-17-001

Hoploscaphites brevis with Baculites compressus Pierre Formation Upper Cretaceous (Campanian) Pennington County, South Dakota Seen here is an excellent example of the macroconch form of H. brevis. The specimen has the original shell, and it has some red iridescent on the living chamber. Some of the sutures are visible on the phragmocone. This specimen has very well-defined nodes typical of the species. It is complete all the way to the aperture. The specimen has no repair. The ammonite is 3.25 inches. It is prepared on its original matrix and has a 7-inch section of B. compress associated. The baculite has almost a complete living chamber and 2.5 inches of phragmocone. As an added bonus there is an immature scaphite within the living camber of the baculite. The baculite is repaired H. nodosus somewhat compressed compaired to H. nodosus. The body chamber has a short shaft and a recurved hook that extends slightly below the phragmocone. The ribs tend to bifurcate but remain fairly straight and are prominent. There is a prominent row of tubercles that begin on the phragmocone and can extend the entire length of the body chamber. A second row of tubercles are found on the flank above the umbilical shoulder. H. brevis ranges from the Didymoceras cheyennense through the Baculites reesidei Range Zone and is found throughout the Western Interior Seaway.