阿武隈山地・高倉山層群(ペルム紀)のPhillipsiidae新属三葉虫

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書誌事項

タイトル別名
  • New Genera of Trilobite Family Phillipsidae from the Takakura-yama Group (Permian), Abukuma Massif in Japan
  • アブクマ サンチ タカクラサンソウグン ペルムキ ノ phillipsiidae シン ゾク サンヨウチュウ

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抄録

Endops yanagisawai (Endo & Matsumoto) gen nov. 1) Dorsal shield oval. 2) Glabella urceolate, strongly expanded forward with a flat marginal border, granulose. 3) Occipital ring rather with tubercles stand in a line. 4) Preoccipital lobe small, length-ways elongate, trigonal. 5) Eyes large, reniform, half long as grabella. 6) Free check rim inflated or slightly rounded. 7) Genal spines short. 8) Thorax consists of ten segments. 9) Pygidium semicircular, axis composed of 8 to 9 segments, pleurae about 6 or 7 segments, rather, finely granulose.10) Occurs in the Yabeina zone of the Upper Permian, in G2 valley, Takakura-yama, northwest of Tamayama Mineral Spring, Yotsukura Town, Iwaki City, Fukushima Prefecture. Nipponaspis takaizumii Koizumi, gen. et sp. now. 1) Dorsal shield elongate oval. 2) Cephalon semicircular; geneal spine short. 3) Glabella lengthways elongate, narrow in the middle, widest at the posterior. 4) Lateral glabellar furrow in four pairs, shallow and short. 5) Frontal part of glabella without flat marginal border, but a narrow preglabellar field present. 6) Occipital ring rather wide with a tubercle. 7) Eyes very large, reniform, two thrids as glabella. 8) Genal spine short. 9) Thorax consists of 9 segments. 10) Pygidum semicircular, axis composed of 12 to 13 segments, pleurae composed of about 8 segments. Fringe of pygidium wide. 11) Occurs in the Yabeina zone G2 valley, Takakura-yama.

収録刊行物

  • 地球科学

    地球科学 26 (1), 19-25, 1972

    地学団体研究会

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