The chondrichthyan tooth remains from the Carboniferous and Permian of Fukuji, Gifu Prefecture, central Japan

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  • 岐阜県上宝村福地の石炭系およびペルム系から産出した軟骨魚類の歯化石
  • ギフケン カミタカラムラ フクジ ノ セキタンケイ オヨビ ペルムケイ カラ サンシュツ シタ ナンコツギョルイ ノ ハカセキ

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Abstract

This paper is the first report of chondrichthyan tooth remains from the Carboniferous and Early Permian formations of Japan. Fourteen specimens of chondrichtyan teeth discovered in Fukuji district, Kamitakara-mura, Gifu Prefecture, Hida marginal belt, central Japan, are described. Five specimens of elasmobranchian teeth, three specimens of petalodont teeth and five specimens of cochliodont tooth plates including three new species are found from the Ichinotani Formation (Upper Carboniferous). One specimen of petalodont tooth is yielded from the Mizuyagadani Formation (Lower Permian). Thirteen fossil specimens of chondrichthyan fishes from a gray limestone of the zone of the Fusulinella-Fusulina of the Ichinotani Formation (Moscovian, Late Carboniferous) are as follows. Cladodus sp. indet. 1 and C. sp. indet. 2 are represented by large cladodont type teeth with five and three cusps. Cladodus sp. indet. 3 and C. sp. indet. 4 are represented by small cladodont type teeth with seven or nine cusps. Agassizodus sp. indet. is represented by a large pavement type lateral tooth with moderately sharp crest and very pronounced labial buttresses. Petalodus allegheniensis Leidy is represented by a large symphyseal tooth with triangular crown and linguiform root. Janassa sp. indet. 1 and J. sp. indet. 2 are represented by symphyseal teeth with spatulate and blunt shaped crown and short root. Poecilodus sp. indet. is represented by a small elongate tooth plate with three transverse ridges and grooves. Cyrtonodus fukujiensis n. sp. is represented by a elongate tooth plate with a long tear shaped crest on the tetragonal base. C. brevis n. sp. is represented by a tooth plate with a short tear shaped crest on the tetragonal base. C. nishioi n. sp. is represented by a tooth plate which is bearing a low wide crest with a spine on the tetragonal base. Cochliodontidae gen. et sp. indet. is represented by a small tooth plate with five transverse ridges and grooves. Only one specimen of Petalodus acuminatus (Agassiz) is yielded from a gray green limestone of the zone of Pseudoshwagerina of the Mizuyagadani Formation (Asselian, Early Permian). P. acuminatus is represented by a large lateral tooth with low triangular crown and short linguiform root.

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