朝鲜半岛寒武纪helcionelloids(单瓣软体动物):系统修正与生物地层

Yeong-Hee Oh, Dong‐Chan Lee, Dong-Jin Lee, Jeong-Gu Lee
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引用次数: 5

摘要

摘要根据韩国寒武系文庆群的新材料和模式标本的重新鉴定,对朝鲜半岛的Helcionelloids进行了修订。区系主要有红绒螺旋体、绒棉螺旋体、太平洋绒棉螺旋体,如绒棉螺旋体、绒棉螺旋体和绒棉螺旋体。Coreospira和Hampilina与其他helcioneloid的区别在于它们在背侧表面之间的角连接处,以及在连接处存在或不存在圆形脊。根据华北的年代地层方案,朝鲜螺纹石在地层学上的分布范围从毛川纪基底到徐川纪下;这与上四期至下五流期有关。不同寻常的鼻中隔特征,如Hampilina的复杂缝合线和Coreospira的简单凸鼻中隔的中心圆形结构,出现在朝鲜helcionelloids的顶端区域,可能与单瓣软体动物的进化有关。忠北大学地球环境科学系吴荣柱[yjoh@kopri.re.kr],忠北清州28644;忠北大学地球科学教育系李东灿[dclee@chungbuk.ac.kr],忠北清州28644;吉林大学地球科学学院,吉林长春130061;李正九[leejg0310@korea.kr]果川国立科学馆,果川13817
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cambrian helcionelloids (univalved molluscs) from the Korean Peninsula: systematic revision and biostratigraphy
Abstract Helcionelloids from the Korean Peninsula are revised based on a re-examination of type specimens and new material collected from the Cambrian Mungyeong Group of South Korea. The fauna comprises Coreospira rugosa, Hampilina goniospira, Dorispira pacifica, cf. Igorella coreanica, and Helcionelloid indet. Coreospira and Hampilina are distinguished from other helcionelloids by their angular junction between dorsal and lateral surfaces, and from each other by the presence or absence of a rounded ridge along the junction, respectively. The Korean helcionelloids range stratigraphically from the base of Maochuangian to the lower Hsuchuangian using the chronostratigraphical scheme from North China; this correlates with upper Stage 4 to the lower Wuliuan Stage. Unusual septal features, such as complex suture lines in Hampilina and a central circular structure in the simple convex septa of Coreospira, occur in the apical region of the Korean helcionelloids, and could have implications for univalved molluscan evolution. Yeongju Oh [yjoh@kopri.re.kr ], Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea; Dong-Chan Lee [dclee@chungbuk.ac.kr ], Department of Earth Science Education, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea; Dong-Jin Lee [lichenaria@daum.net ], College of Earth Sciences, Jilin University, Changchun 130061, China; Jeong-Gu Lee [leejg0310@korea.kr ] Gwacheon National Science Museum, Gwacheon 13817, Republic of Korea
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