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1 April 2022 Tohokubelus gen. nov., the Oldest Belemnite from the Olenekian (Lower Triassic) of Northeast Japan
Shuji Niko, Masayuki Ehiro
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Abstract

A new sinobelemnitid belemnite genus, Tohokubelus, is described based on T. takaizumii sp. nov. from the late Olenekian (late Early Triassic) mudstone of the Osawa Formation belonging to the South Kitakami Belt in the Utatsu area, Miyagi Prefecture, Northeast Japan. The present discovery is important because this species is the oldest belemnite and extends downwardly the range of the Belemnitida from the Carnian (early Late Triassic). We concluded that the order appeared first in the earliest Triassic in the low-latitude area of the westernmost part of the Panthalassa, then belemnites spread to habitats in the Paleo- and Neo-Tethys in the Early Jurassic by the equatorial currents from the Panthalassa to the Tethys.

© by the Palaeontological Society of Japan
Shuji Niko and Masayuki Ehiro "Tohokubelus gen. nov., the Oldest Belemnite from the Olenekian (Lower Triassic) of Northeast Japan," Paleontological Research 26(2), 115-123, (1 April 2022). https://doi.org/10.2517/PR200036
Received: 28 August 2020; Accepted: 6 November 2020; Published: 1 April 2022
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KEYWORDS
Belemnitida
Osawa Formation
Sinobelemnitidae
South Kitakami Belt
Triassic
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