Cephalopoda - Ammonitida - Pachydiscidae
Full reference: D. L. Jones. 1963. Upper Cretaceous (Campanian and Maestrichtian) ammonites from southern Alaska. United States Geological Survey Professional Paper 432:1-53
Belongs to Pachydiscus (Pachydiscus) according to D. L. Jones 1963
Sister taxa: Pachydiscus (Pachydiscus) arkansanus, Pachydiscus (Pachydiscus) australis, Pachydiscus (Pachydiscus) awajiensis, Pachydiscus (Pachydiscus) cayeuxi, Pachydiscus (Pachydiscus) complanatus, Pachydiscus (Pachydiscus) dossantosi, Pachydiscus (Pachydiscus) duelmensis, Pachydiscus (Pachydiscus) egertoni, Pachydiscus (Pachydiscus) gutierrezi, Pachydiscus (Pachydiscus) haldemsis, Pachydiscus (Pachydiscus) hazzardi, Pachydiscus (Pachydiscus) jacquoti, Pachydiscus (Pachydiscus) jeani, Pachydiscus (Pachydiscus) neubergicus, Pachydiscus (Pachydiscus) noetlingi, Pachydiscus (Pachydiscus) oldhami, Pachydiscus (Pachydiscus) ootacodensis, Pachydiscus (Pachydiscus) paulsoni, Pachydiscus (Pachydiscus) rogeri, Pachydiscus (Pachydiscus) ultimus, Pachydiscus (Pachydiscus) yama
Type specimen: USNM 131193, a shell. Its type locality is USGS Loc. 16398, Matanuska Valley-Nelchina [Matanuska Fm], which is in a Campanian marine siltstone/shale in the Matanuska Formation of Alaska.
Ecology: fast-moving nektonic carnivore
Average measurements (in mm): shell diameter 150.1
Distribution:
• Cretaceous of United States (16: Alaska collections)
Total: 16 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.