''Urakawites'' is an extinct

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

from the

Upper Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...

(

Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian s ...

) of Japan, Sakhalin, Russia, British Columbia, Canada and possibly Germany and Angola. ''Urakawites'' is placed in the family is

Pachydiscidae Pachydiscidae is a family of middle and upper Cretaceous ammonites in the superfamily Desmoceratoidea. Morphology Pachydiscidae species are moderate to large in size, evolute to rather involute, and vary in section from inflated and depressed to ...

. ''Urakawites'' is characterized by a bituberculate (meaning it has two rows of tubercles on either side), strongly ribbed, moderately compressed shell.

References

* Arkell, et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology Part L. Geol Soc of America and Univ Kansas Press. R.C. Moore ed. * Matsumoto, T. 1955. The bituberculate pachydiscids from Hokkaido and Saghalien. Studies on the Cretaceous ammonites from Hokkaido and Sakhalin 8. Memoirs of the Faculty of Science, Kyushu University, Series D, vol. 5, no. 3, pp. 153–184
''Urakawites rotalinoides'' (Yabe)
Ammonitida genera Cretaceous ammonites Campanian life Desmoceratoidea {{ammonite-stub