A new species of Stacheoceras (Permian ammonoid) from the Upper Permian in the South Kitakami Belt, Northeast Japan
A new species of Stacheoceras (Permian ammonoid) from the Upper Permian in the South Kitakami Belt, Northeast Japan
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DOI：
10.2517/prpsj.10.261
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发表时间：
2006-09
期刊：
影响因子：
--
通讯作者：
M. Ehiro
中科院分区：
文献类型：
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作者：
M. Ehiro
Stacheoceras Gemmellaro是一个众所周知的全球分布的二叠纪菊石属，范围从Artinskian到Changhsingian（Kullmann等人，2000）或从昆古阶到长兴阶（Leonova，2002）。迄今为止，全世界已知的该属有50多种，几乎所有的都是相当小的，直径小于10厘米。只有2种，即秀康枝角木Stacheoceras xiukangense Sheng和秀康枝角木S. raridentatum Sheng，采自中国西南部西藏，直径达10 cm以上（Sheng，1984，1988）。在日本东北部南北上带的沃迪阶至长兴阶地层中，发现了以下形态规则的Stacheoceras分类群：Stacheoceras aff。grunwaldti Gemmellaro（Hayasaka，1965），S. iwaizakiense Mabuti（Mabuti，1935; Ehiro和Bando，1985），S. otomoi Ehiro，Shimoyama和Murata（Ehiro等人，1986），S.参见trimulti Diener（二叠-三叠系工作组，1975）和S.（Hayasaka，1940; Koizumi，1975; Ehiro等，1986; Ehiro和Araki，1997; Ehiro，2001）。最近在日本东北部南北上带上二叠统发现了一个相当大的柱角石标本。它也有一个更复杂的外部缝合线比所有以前已知的物种。本文记述了一新种，Stacheoceras acuteum sp. nov. Stacheoceras acuteum sp. nov.由长谷川仁志（Hitoshi Hasegawa）从宫城县元吉郡南三陆町（原宇达町）石滨太平洋沿岸沿着出露的末之崎组下部泥岩中的钙质结核中采集。化石产地与Loc相同。3号的菊石化石，发现了Stacheoceras iwaizakiense Mabuti，Timorites intermedium（Wanner），Pseudogastrioceras sp.，阿拉角角石属rotoides Ruzhentsev、圆叶甲A.例如，Vescotoceras japonicum（Bando and Ehiro），V. sp.，朱尔佛菊石属Ruzhentsev（Ehiro和Bando，1985; Ehiro等人，1986; Ehiro，2001）。根据这些菊石化石，特别是Pseudogastrioceras、Araxoceras、Vescotoceras和Dzhulfoceras的产出，将末之崎组下部的化石层位与上二叠统武家坪阶（Ehiro and Bando，1985; Ehiro，2001）进行了对比
Stacheoceras Gemmellaro is a well known, globally distributed genus of Permian ammonoids ranging from the Artinskian to Changhsingian (Kullmann et al., 2000) or from the Kungurian to Changhsingian (Leonova, 2002). Over 50 species of the genus have hitherto been known worldwide, almost all of which are rather small in size, with diameters less than 10 cm. Only two species, Stacheoceras xiukangense Sheng and S. raridentatum Sheng from Xizang, southwest China, attain a diameter over 10 cm (Sheng, 1984, 1988). The following taxa of Stacheoceras, all regularsized, have been reported from the Wordian to Changhsingian strata of the South Kitakami Belt, Northeast Japan: Stacheoceras aff. grunwaldti Gemmellaro (Hayasaka, 1965), S. iwaizakiense Mabuti (Mabuti, 1935; Ehiro and Bando, 1985), S. otomoi Ehiro, Shimoyama and Murata (Ehiro et al., 1986), S. cf. trimulti Diener (Working Group on the PermianTriassic Systems, 1975) and S. sp. (Hayasaka, 1940; Koizumi, 1975; Ehiro et al., 1986; Ehiro and Araki, 1997; Ehiro, 2001). Recently a considerably large specimen of Stacheoceras was recovered from the Upper Permian of South Kitakami Belt, Northeast Japan. It has also a more complex external suture line than all the previously known species. This paper describes it as a new species, Stacheoceras giganteum sp. nov. Stacheoceras giganteum sp. nov. was collected by Hitoshi Hasegawa from a calcareous nodule included in mudstone of the lower part of the Suenosaki Formation exposed along the Pacific coast of Ishihama, Minamisanriku-cho (former Utatsu-cho), Motoyoshigun, Miyagi prefecture. The fossil locality is the same as Loc. 3 of Utatsu district in Ehiro and Bando (1985) and yields such ammonoid fossils as Stacheoceras iwaizakiense Mabuti, Timorites intermedium (Wanner), Pseudogastrioceras sp., Araxoceras cf. rotoides Ruzhentsev, A. sp., Vescotoceras japonicum (Bando and Ehiro), V. sp., Dzhulfoceras cf. furnishi Ruzhentsev (Ehiro and Bando, 1985; Ehiro et al., 1986; Ehiro, 2001). Based on these ammonoids, especially on the occurrence of Pseudogastrioceras, Araxoceras, Vescotoceras and Dzhulfoceras, the fossil horizon of the lower part of the Suenosaki Formation is correlatable with the Upper Permian Wuchiapingian (Ehiro and Bando, 1985; Ehiro, 2001)