788. A MIDDLE DEVONIAN TRILOBITE FAUNA FROM THE KITAKAMI MOUNTAINS. NORTHEAST JAPAN : I. THE LICHIDAE

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Other Title
  • 788. 北上山地中部デボン系中里層産の三葉虫動物群について : その 1, Lichidae 科
  • 北上山地中部デボン系中里層産の三葉虫動物群について-1-Lichidae科〔英文〕
  • キタカミ サンチ チュウブ デボンケイ ナカザトソウサン ノ サンヨウチュウ

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Abstract

A trilobite fauna has been discovered from the Middle Devonian Nakazato Formation in the southern part of the Kitakami Mountains in northeastern Honshu, Japan. The fauna is composed of lichid, scutellid, dechenellid, calymenid, phacopid, dalmanitid and odontopleurid trilobites from the Higuchi-zawa and Ohmori-zawa, Hikoroichi-cho, Ofunato City, Iwate Prefecture. The purpose of the present paper is to give a description of the trilobites from the Higuchi-zawa locality of the fauna. A new lichid genus Nipponarges gen. nov. and its type-species Nipponarges mediosulcatus, gen. et sp. nov. and a new lichid species Acanthopyge (Acanthopyge) duplicispinata, sp. nov. are proposed in this part. Thysanopeltella paucispinosa (Okubo, 1951) and Dechenella (Dechenella) minima (Okubo, 1951), which had been previously considered to be reliable fossil evidences of the Eifelian in the Ohmori-zawa and of the Givetian in the Higuchi-zawa respectively, co-exist at the Higuchi-zawa locality. In the present state of knowledge it is only Thysanopeltella Kobayashi 1957 that can be used as an age indicator of this trilobite fauna. Therefore, the geological age of the fauna may be Eifelian.

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