A Monograph of the Collignoniceratidae from Hokkaido Part Ⅳ : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien－ⅩⅩⅠ

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タイトル別名
  • A Monograph of the Collignoniceratidae from Hokkaido Part Ⅲ : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien-XX
  • A Monograph of the Collignoniceratidae from Hokkaido Part I : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien-XIV
  • A Monograph of the Collignoniceratidae from Hokkaido Part V : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien－XXIII
  • A Monograph of the Collignoniceratidae from Hokkaido Part Ⅱ : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien－XV

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説明

Part Ⅲ contains the systematic descriptions of the subfamily Barroisiceratinae. The hitherto used framework of classification of the Barroisiceratinae is to some extent modified. Basseoceras COLLIGNON, 1965, is regarded as a subgenus of Barroisiceras, whereas Texasia is separated as a distinct genus. A new subgenus of Forresteria is established which is characterized by a smoothed outer whorl. This is morphologically transitional to more evolute Yabeiceras, which is settled as a specialized offshoot in the Barroisiceratinae. The described species from Hokkaido are altogether seven:-a new species of Barroisiceras (Basseoceras), two species of Forresteria (Forresteria), including world-wide F. (F.) alluaudi in a revised sense and a new one, two new species of a new subgenus of Forresteria, a species of Yabeiceras and a species of Harleites. In connection with the descriptions of the barroisiceratine ammonites from Hokkaido, comments are generally given on many genera and subgenera, and also on some species occurring outside Hokkaido.

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