2022/04/01 by Shuji Niko, Masayuki Ehiro · 1 citation
Earth and Planetary Sciences · #Paleontology and Stratigraphy of Fossils #Paleontology and Evolutionary Biology #Evolution and Paleontology Studies
paper · doi:10.2517/pr200036
openalex publication_date 2022/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
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.