Additional thylacocephalans (Arthropoda) from the Lower Triassic (upper Olenekian) Osawa Formation of the South Kitakami Belt, Northeast Japan
作者： Masayuki Ehiro , Osamu Sasaki , Harumasa Kano , Toshiro Nagase
DOI: 10.1016/J.PALWOR.2019.03.001
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摘要: Abstract The Lower Triassic Osawa Formation in the South Kitakami Belt, Northeast Japan, consisting mostly of mudstone shallow-marine environment, was deposited during late Olenekian (ca. 250 Ma), and is an important unit through which to examine biotic recovery process after end-Permian mass extinction. only Japan that yields thylacocephalans (Arthropoda). Three species belonging three genera have been reported before: Ankitokazocaris bandoi, Kitakamicaris utatsuensis Ostenocaris sp. In addition known species, some thylacocephalans, including one new genus are described present paper: tatensis n. sp., Concavicaris parva Miyagicaris costata gen. Ostenocaris? Although Thylacocephala a rather long stratigraphic range (from Silurian Cretaceous) from wide geographical region, there about thirty this group. thylacocephalan fauna comprises at least five genera, making it most diverse world generic level. During Period, diversified spread widely throughout low-latitude regions.
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