二叠纪触手类化石Iwakiella ichiroi Hatai, Kotaka and Noda, 1972，作为正角目头足类动物的再检验

IF 1.3 4区地球科学 Q3 PALEONTOLOGY

Paleontological Research Pub Date : 2022-07-01 DOI:10.2517/PR200010

S. Niko

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引用次数: 0

摘要

摘要对日本东北部二叠系Kashiwadaira段Iwakiella ichiroi Hatai, Kotaka和Noda, 1972的全型进行了重新研究。虽然之前被放置在触手总目或保留在问题总目中，但拥有鼻中隔和初始腔室的球形表明该标本属于头足纲的球形正角角亚目。以2000年的Hidagaienites arcuatus Niko为最新代表，证实了触手科可能在石炭-二叠纪界线附近灭绝。

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Reexamination of a Permian Tentaculites-Like Fossil Iwakiella ichiroi Hatai, Kotaka and Noda, 1972, as an Orthocerid Cephalopod

Abstract. The holotype of Iwakiella ichiroi Hatai, Kotaka and Noda, 1972, from the Permian Kashiwadaira Member of Northeast Japan is reexamined. Although previously placed within the Tentaculitoidea or retained in the Problematica, the possession of the septum and the spherical shape of the initial chamber suggest that this specimen belongs to sphaerorthoceratid orthocerid of the Cephalopoda. The present result confirms that the Tentaculitoidea probably became extinct near the Carboniferous – Permian boundary with Hidagaienites arcuatus Niko, 2000, as the latest representative.

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来源期刊

Paleontological Research PALEONTOLOGY-

CiteScore

1.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Paleonotological Research (PR) is a quarterly, peer-reviewed international journal, which focuses on original contributions primarily in the area of paleontology but also covering a wide range of allied sciences. It has been published since 1997 as a successor to the former journal Transactions and Proceedings of the Palaeontological Society of Japan. The emphasis of contributions will include global and local perspectives, and contents can cover all ages (Precambrian to the Quaternary, including the present time).