中国科学院南京地质古生物研究所机构知识库

寒武系腕足动物属种多样性高、个体数量丰富、形态差异明显、地理分布广泛, 具有辅助寒武系三叶虫
生物地层划分和对比的潜力。华北板块寒武系苗岭统沉积和化石记录发育良好, 是中国苗岭统的经典研究区之
一。前人已针对华北寒武系苗岭统乌溜阶腕足动物的系统古生物学开展了一系列基础工作, 但这些相关研究主
要集中于辽宁地区, 目前对华北其他地区苗岭统乌溜阶腕足动物的研究程度仍然有限, 相关生物地层学也有待
进一步探索。本文首次系统描述了山东潍坊寒武系苗岭统乌溜阶馒头组上部碎屑岩中的腕足动物, 共鉴定出舌
形贝型亚门4 属5 种, 包括馒头组洪河段的舌孔贝未定种Lingulellotreta sp. indet.以及馒头组上页岩段的山西小
舌形贝Lingulella shansiensis (Walcott, 1905)、德姆斯小舌形贝Lingulella damesi (Walcott, 1905)、伊瑞克乳房贝
Acrothele eryx (Walcott, 1905)和东方原孔贝Prototreta orientalis (Resser and Endo, 1937)。值得注意的是, 在馒头
组上页岩段的3 层岩性略有差异的泥岩中, 分布着3 层完全不同的腕足动物, 共有4 种, 但这3 个组合都位于
Bailiella lantenoisi 带这一三叶虫生物带。腕足动物组合在极短时间内的快速交替现象, 表明了腕足动物对环境
背景的微弱变化具有较强的响应。

The Cambrian brachiopods had high species diversity, remarkable individual abundance, considerable
morphological variation and wide geographical distribution, showing the potential in assisting the Cambrian biostratigraphic
subdivision and correlation based on trilobites. The North China plate possesses well-developed sedimentary
and fossil records of the Cambrian Miaolingian and has been one of the classic research areas of the Miaolingian in
China. A series of previous works have been done on the systematic palaeontology of Cambrian Miaolingian Wuliuan
brachiopods from North China. However, these relevant studies were mainly concentrated within the Liaoning area.
The current research on the Cambrian Miaolingian Wuliuan brachiopods in other parts of North China is limited, and
the related biostratigraphy also needs further exploration. In this paper, we systematically describe for the first time the
brachiopods from the clastic rocks of the upper part of the Mantou Formation (Cambrian, Miaolingian, Wuliuan) in
Weifang, Shandong. A total of four genera and five species of the subphylum Linguliformea were identified, including
Lingulellotreta sp. indet. from the Honghe Member of the Mantou Formation, as well as Lingulella shansiensis (Walcott,
1905), Lingulella damesi (Walcott, 1905), Acrothele eryx (Walcott, 1905) and Prototreta orientalis (Resser and
Endo, 1937) from the Upper Shale Member of the Mantou Formation. It is worth noting that there are four brachiopods
species in three layers of slightly lithologically different mudstones in the Upper Shale Member of the Mantou Formation,
but all the three assemblages fall within the Bailiella lantenoisi Zone, which is a single trilobite biozone. The
rapid alternation of brachiopod assemblages in a very short period indicates that brachiopods might have a strong response
to weak changes in environmental background.