岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

岡山県新見市の中新世備北層群からのPeriploma mitsuganoense Araki (Bivalvia: Mollusca)について ―特にその古地理学的意義―

田口 栄次
岸本 眞五
鈴木 茂之 岡山大学理学部地球科学科
抄録
In this paper, we deal with re-description of Periploma mitsuganoense Araki and it’s morphological variation and significance of the molluscan fauna of it from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, Southwest Japan. Moreover, the paleogeographic significance of this species is analyzed. The obtained results are summarized as follows: 1. The morphological variation of Periploma mitsuganoense Araki has a wide range on the basis of the analysis of the morphological outline. 2. The occurrence of P. mitsuganoense Araki from the Pectinid fauna is the first record in the West Setouchi Geological Province. 3. It is presumable that P. mitsuganoense Araki is an endemic species in the First Setouchi Geological Province from a view point of it’s spatial distribution.
キーワード
Periploma mitsuganoense Araki
Mollusca
Miocene
Bihoku Group
morphological variation
paleogeographic significance
ISSN
1340-7414
NCID
AN10506284
NAID