Preservational Pathways of Corresponding Brains of a Cambrian Euarthropod

Xiaoya Ma, Gregory D. Edgecombe, Xianguang Hou, Tomasz Goral, Nicholas J Strausfeld

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The record of arthropod body fossils is traceable back to the "Cambrian explosion," marked by the appearance of most major animal phyla. Exceptional preservation provides crucial evidence for panarthropod early radiation. However, due to limited representation in the fossil record of internal anatomy, particularly the CNS, studies usually rely on exoskeletal and appendicular morphology. Recent studies [1-3] show that despite extreme morphological disparities, euarthropod CNS evolution appears to have been remarkably conservative. This conclusion is supported by descriptions from Cambrian panarthropods of neural structures that contribute to understanding early evolution of nervous systems and resolving controversies about segmental homologies [4-12]. However, the rarity of fossilized CNSs, even when exoskeletons and appendages show high levels of integrity, brought into question data reproducibility because all but one of the aforementioned studies were based on single specimens [13]. Foremost among objections is the lack of taphonomic explanation for exceptional preservation of a tissue that some see as too prone to decay to be fossilized. Here we describe newly discovered specimens of the Chengjiang euarthropod Fuxianhuia protensa with fossilized brains revealing matching profiles, allowing rigorous testing of the reproducibility of cerebral structures. Their geochemical analyses provide crucial insights of taphonomic pathways for brain preservation, ranging from uniform carbon compressions to complete pyritization, revealing that neural tissue was initially preserved as carbonaceous film and subsequently pyritized. This mode of preservation is consistent with the taphonomic pathways of gross anatomy, indicating that no special mode is required for fossilization of labile neural tissue.

Original languageEnglish (US)
Pages (from-to)2969-2975
Number of pages7
JournalCurrent Biology
Volume25
Issue number22
DOIs
StatePublished - Nov 16 2015

Fingerprint

reproducibility
Brain
Anatomy
nerve tissue
fossils
Tissue
Tissue Preservation
brain
exoskeleton
Arthropods
Explosions
explosions
appendages
nervous system
Nervous System
arthropods
Carbon
deterioration
Neurology
Radiation

Keywords

  • arthropod
  • brains
  • Cambrian
  • Chengjiang biota
  • exceptional preservation
  • geochemistry

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Preservational Pathways of Corresponding Brains of a Cambrian Euarthropod. / Ma, Xiaoya; Edgecombe, Gregory D.; Hou, Xianguang; Goral, Tomasz; Strausfeld, Nicholas J.

In: Current Biology, Vol. 25, No. 22, 16.11.2015, p. 2969-2975.

Research output: Contribution to journalArticle

Ma, Xiaoya ; Edgecombe, Gregory D. ; Hou, Xianguang ; Goral, Tomasz ; Strausfeld, Nicholas J. / Preservational Pathways of Corresponding Brains of a Cambrian Euarthropod. In: Current Biology. 2015 ; Vol. 25, No. 22. pp. 2969-2975.
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