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Occurrence of Microdictyon from the lower Cambrian Xinji Formationalong the southern margin of the North China Platform
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
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2018 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 91, no 1, p. 59-70Article in journal (Refereed) Published
Abstract [en]

Disarticulated net-like plates of the lobopod Microdictyon had a near cosmopolitan distribution from the early to middle Cambrian, but are yet to be documented from the North China Platform. Here we report isolated plates of Microdictyon from the lower Cambrian Xinji Formation (Stage 4, Series 2) of the North China Platform, extending the paleogeographic distribution of Microdictyon in the early Cambrian. The plates of Microdictyon from the Xinji Formation are similar to those of other species established on the basis of isolated plates, but do bear some new characters, such as mushroom-shaped nodes with a single inclined platform-like apex, and an upper surface that displays radial lines. However, the plates documented here are left under open nomenclature due to an inadequate knowledge of intraspecific and ontogenetic variation and low specimen numbers. Through comparison of the node shapes of the isolated plates of different Microdictyon species, we consider that low mushroom-shaped nodes could be a primitive and conservative character of Microdictyon, while tall mushroom-shaped nodes may be derived character. Subtle differences in shape and number of node apices may also represent intraspecific or ontogenetic variation.

Place, publisher, year, edition, pages
2018. Vol. 91, no 1, p. 59-70
National Category
Geology
Research subject
Diversity of life
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URN: urn:nbn:se:nrm:diva-2868DOI: 10.1017/jpa.2017.47OAI: oai:DiVA.org:nrm-2868DiVA, id: diva2:1256029
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-24Bibliographically approved

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