Cephalopoda - Ammonitida - Tetragonitidae
Full reference: Y. Shigeta and T. Nishimura. 2013. A new species of Gaudryceras (Ammonoidea, Gaudryceratidae) from the lowest Maastrichtian of Hokkaido, Japan and its biostratigraphic implications. Paleontological Research 17:47-57
Belongs to Gaudryceras according to Y. Shigeta and T. Nishimura 2013
Sister taxa: Gaudryceras (Gaudryceras), Gaudryceras aenigma, Gaudryceras beantalyense, Gaudryceras crassicostatum, Gaudryceras izumiense, Gaudryceras kayei, Gaudryceras makarovense, Gaudryceras mite, Gaudryceras numidum, Gaudryceras propemite, Gaudryceras seymouriense, Gaudryceras stefaninii, Gaudryceras striatum, Gaudryceras tenuiliratum, Gaudryceras varagurense, Lytoceras (Gaudryceras) alamedense, Lytoceras (Gaudryceras) delvallense, Lytoceras (Gaudryceras) neptunium, Lytoceras (Gaudryceras) texanum, Mesogaudryceras leptonema, Vertebrites murdochi, Gaudryceras (Neogaudryceras) pictum
Type specimen: HMG-1573, a shell. Its type locality is Tributary of Tonai-zawa River, which is in a Maastrichtian marine mudstone in the Hakobuchi Formation of Japan.
Ecology: fast-moving nektonic carnivore
Average measurements (in mm): shell diameter 84.0
Distribution:
• Cretaceous of Japan (4 collections), United States (1: Alaska)
Total: 5 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.