Triassic coniform conodont genera Aduncodina and Neostrachanognathus
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概要
- 論文の詳細を見る
Lower Triassic coniform conodonts Aduncodina unicosta Ding and Neostrachanognathus tahoensis gen. et sp. nov. from the pelagic limestone of the Taho Formation in Ehime Prefecture, Southwest Japan are newly reconstructed as quadrimembrate apparatuses with the M, Sa, Sb, and Sc elements. A. unicosta Ding, originally described as a form species, is the Sb element of the skeletal apparatus of A. unicosta, newly conceived. Furthermore, the form species Cornudina anterodentata Ding and C. angularis Wang and Cao are referable to the Sa and Sc elements of A. unicosta, respectively. The elements of A. unicosta and N. tahoensis are all coniform types. The M elements of the two species are adenticulated and the Sa, Sb, and Sc elements are denticulated with one to four denticles on the anterobasal margin of the base. The morphologic similarity between Triassic A. unicosta and N. tahoensis and the Early to Middle Paleozoic coniform-type conodonts probably represents an adaptive convergence of the feeding apparatuses. A. unicosta and N. tahoensis indicate the early Spathian.
- 日本古生物学会の論文
- 1998-06-30
著者
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KOIKE Toshio
Department of Civil Engineering, The University of Tokyo
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Koike Toshio
Department Of Civil Engineering The University Of Tokyo
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Koike Toshio
Department Of Science Education Faculty Of Education And Human Sciences Yokohama National University
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