Traces of marine nematodes from 470 million years old Early Ordovician rocks in China

in Nematology
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Cylindrical, mostly horizontal, burrows of 20-60 μm diam. and sinusoidal course, found in the middle part of the Early Ordovician (early Floian) Fenxiang Formation in the Hubei Province of China, represent the oldest record of activity by marine nematodes, preceding known nematode body fossils by 70 million years. The burrows are filled with secondarily oxidised pyrite framboids and clay mineral flakes, indicating low oxygen content in the mud and proving that the animals lined their burrows with organic matter, being bacteriovores and mud-eaters. The marine bottom environment enabling such a mode of life originated no earlier than the mid Early Cambrian (approximately 535 million years ago) owing to peristaltic bioturbation, mostly by nemathelminthans of priapulid affinities. Before the so-called ‘Agricultural Revolution’, the bottoms of shallow seas were covered with microbial mats preventing within-sediment animal life. This event imposes the lower time limit on the possible date of origin of nematodes.

Nematology

International Journal of Fundamental and Applied Nematological Research

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Figures

  • Location of the Tianjialing section in the Three Gorge area of Hubei Province, southern China. A: Geological map; B: Rock column of the Fenxiang Formation with the source level of the sinusoidal traces indicated (modified after Baliński et al., 2012).

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  • Sinusoidal tracks in the shale intercalation within the Fenxiang Formation collected at the Tianjialing section. A: The longest linear track crossing with another one under angle. Note that the pyritised (secondarily oxidised) infill of the burrows is preserved three-dimensionally. The rusty coloration of the rock nearby is a result of weathering; B: More typical arrangement of tracks; C: Burrow crossing sediment laminae and with vertical plane of sinusoidal undulation (arrows point to parts of the burrow covered with sediment; see also the seemingly straight burrow in B); D, E: Intensely bioturbated portion of the shale. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/15685411.

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  • SEM images and EDS analysis of burrows from the Early Ordovician Fenxiang Formation, China. A: Images with Back-scatter Electron Detector of a portion of rock slab with sinusoidal burrow; B: Enlarged infill of the burrow with pyritic framboids; C: Oblique view of transverse fracture of the burrow showing its three-dimensional aspect and low degree of compaction; D-I: SEM picture and element maps of a piece of burrow; width of the burrow marked with arrows; I: EDS spot analysis spectrum revealing relative contents of elements in a framboid. Note the Fe peak, total absence of S, and presence of Si, Al, Mg, and K connected with the matrix clay minerals; specimen coated with carbon. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/15685411.

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