841. ADNATOCERAS FROM MIDDLE CARBONIFEROUS OF THE ICHINOTANI FORMATION, FUKUJI DISTRICT, CENTRAL JAPAN

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  • 841. 岐阜県福地地域, 一ノ谷層の石炭紀中期 Adnatoceras
  • 岐阜県福地地域,一ノ谷層の石炭紀中期Adnatoceras〔英文〕
  • ギフケン フクチ チイキ イチノタニソウ ノ セキタンキ チュウキ Adnat

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Abstract

Adnatoceras ichinotaniensis, sp. nov. is described from a late Bashkirian (Middle Carboniferous) limestone of the Ichinotani Formation in the Fukuji district, central Japan. This species is morphologically characterized by the following features; (1) subcircular cross-section of the shell in early stages, (2) position of the siphuncle shifts ventralwards to some degree from center as the shell grows, and (3) episeptal-mural and hyposeptal deposits are well-developed in apical portion. The genus Adnatoceras has previously been known only from Western Europe, U.S.S.R. and North America of Middle Devonian to Late Carboniferous time.

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