期刊
ACTA PALAEONTOLOGICA POLONICA
卷 67, 期 2, 页码 317-327出版社
INST PALEOBIOLOGII PAN
DOI: 10.4202/app.00946.2021
关键词
Algal fossils; bowl-shaped fossils; early Cambrian; Kuanchuanpu biota
类别
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB26000000]
- Natural Science Foundation of China [41902012, 41772010, 41621003, 41890844, 41720104002]
- 111 Project of the Ministry of Education of China [D17013, D163107]
- State Key Laboratory of Paleobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) [203122, 203106]
The Kuanchuanpu biota from the basal Cambrian in South China has provided valuable insights into the divergent evolution of animal phyla in the early Cambrian ocean. In this study, a new taxon of calathiform alga, Calathophycus irregulatus Tang gen. et sp. nov., and an indeterminate alga were reported from the Kuanchuanpu biota, indicating a certain diversity of algae at the beginning of the Cambrian. The findings also suggest the need for reevaluation of spherical fossils previously interpreted as animal embryo cleavage stages.
The Kuanchuanpu biota (ca. 535 Ma) from the basal Cambrian in South China yields various phosphatized, three -dimensionally preserved microscopic fossils, such as animal embryos, cyanobacteria, and algae. This provides an exceptional window for investigating the rapid divergent evolution of animal phyla in the early Cambrian ocean. However, the fossil eukaryotic algae are poorly documented and are not properly incorporated into the conceptual food web of the Cambrian ocean ecosystem. In this study, we report a new taxon of calathiform alga, Calathophycus irregulatus Tang gen. et sp. nov., and an indeterminate alga, from the Kuanchuanpu biota. Calathophycus irregulatus can be distinguished from other reported phosphatized multicellular algal fossils from the Kuanchuanpu biota and the Ediacaran Weng???an biota (Guizhou Province, China), based on the external morphology and features of cell clump aggregation. The observation of C. irregulatus and the indeterminate alga indicates a certain diversity of algae at the beginning of the Cambrian. Concerning the regularly or irregularly shaped multicellular algal fossils from the Kuanchuanpu Formation, co-occurring spherical fossils, previously interpreted as ???cleavage stage??? of animal embryos, should be reconsidered in affinity.
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