Turrilitid ammonoid Carthaginites from Hokkaido (Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCIV)

Abstract

This paper gives a revised definition of the genus Carthaginites Previnquiere, 1907 on the basis of material from Hokkaido, Japan, that enhances previously available material. Two species from the middle Cenomanian rocks of Hokkaido are described : C. asiaticum (Matsumoto and Takahashi, 2000) and C. yamashitai sp. nov. Brief comments are also made on some species which were previously described from the upper Cenomanian rocks of North America and Europe. Morphologically and stratigraphically Carthaginites is intimately related to Neostlingoceras Klinger and Kennedy, 1978, of early Cenomanian age.