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An epipodite-bearing crown-group crustacean from the Lower Cambrian

Abstract

Crown-group crustaceans (Eucrustacea) are common in the fossil record of the past 500 million years back to the early Ordovician period, and very rare representatives are also known from the late Middle and Late Cambrian periods1. Finds in Lower Cambrian rocks of the Phosphatocopina, the fossil sister group to eucrustaceans2, imply that members of the eucrustacean stem lineage co-occurred, but it remained unclear whether crown-group members were also present at that time. ‘Orsten’-type fossils are typically tiny embryos and cuticle-bearing animals, of which the cuticle is phosphatized and the material is three-dimensional and complete with soft parts. Such fossils are found predominantly in the Cambrian and Ordovician and provide detailed morphological and phylogenetic information on the early evolution of metazoans. Here we report an Orsten-type Konservat-Lagerstätte from the Lower Cambrian of China that contains at least three new arthropod species, of which we describe the most abundant form on the basis of exceptionally well preserved material of several growth stages. The limb morphology and other details of this new species are markedly similar to those of living cephalocarids, branchiopods and copepods and it is assigned to the Eucrustacea, thus representing the first undoubted crown-group crustacean from the early Cambrian. Its stratigraphical position provides substantial support to the proposition that the main cladogenic event that gave rise to the Arthropoda was before the Cambrian3. Small leaf-shaped structures on the outer limb base of the new species provide evidence on the long-debated issue of the origin of epipodites4,5: they occur in a set of three, derive from setae and are a ground-pattern feature of Eucrustacea.

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Figure 1: Y. dianensis ; topotype specimens.
Figure 2: Reconstruction of Y. dianensis on the basis of a larval stage with eight thoracomeres (developmental stage 4).
Figure 3: Proposed phylogenetic position of Y. dianensis , within the crown group of arthropods.

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Acknowledgements

This work was supported by the Natural Science Foundation of China, the Ministry of Science and Technology of China, the Royal Society and the German Research Council.

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Correspondence to Xi-guang Zhang.

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Supplementary information

Supplementary Information

The file contains Supplementary Notes and additional references. The Supplementary Notes provide plainer and more detailed data about the stratigraphy of the Lower Cambrian strata that yielded the Orsten type preservation and the phylogeny of the initial crustacean. (PDF 71 kb)

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Zhang, Xg., Siveter, D., Waloszek, D. et al. An epipodite-bearing crown-group crustacean from the Lower Cambrian. Nature 449, 595–598 (2007). https://doi.org/10.1038/nature06138

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