<紀要論文>
Uncommon Keeled Ammonites from the Upper Cretaceous of Hokkaido and Saghalien : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien- XXII

作成者
本文言語
出版者
発行日
収録物名
開始ページ
終了ページ
出版タイプ
アクセス権
Crossref DOI
概要 I describe in this paper two uncommon keeled ammonites, from the Upper Cretaceous of Hokkaido and South Saghalien, which have been unsettled in their systematic position. One is Pseusdobarroisiceras n...agaoi SHIMIZU, which is closely allied to a weakly ornate variety of Barroisiceras onilahyense but has an entire keel. It is assigned to the Barroisiceratinae, since it did not further give rise to other smoothly keeled ammonites to be grouped with it and since there are certain barroisiceratine ammonites which tend to show smoothing of the serrate keel in more or less late growth-stages. The similarity of Pseudobarroisiceras to Pseudoschloenbachia is superficial, because the latter is best ascribed to the Muniericeratidae, together with Taxasia, Lehmaniceras, etc. The other is a new species of Hourcquia, which is allied to but less typical than H. mirabilis COLLIGNON. It looks as if it were another smoothly keeled barroisiceratine ammonite related to Subbarroisiceras mahafalense BASSE. It is also superficially similar to Diaziceras tissotiaeforme SPATH, which, however, is a member of the Lenticeratinae.続きを見る

本文ファイル

pdf 20_02_p305 pdf 1.91 MB 278  

詳細

PISSN
NCID
レコードID
査読有無
登録日 2015.11.06
更新日 2021.02.18

この資料を見た人はこんな資料も見ています