Trace fossil evidence for Ediacaran bilaterian animals with complex behaviors

Chen, Zhe; Zhou, Chuanming; Meyer, M.; Xiang, Ke; Schiffbauer, James D.; Yuan, Xunlai; Xiao, Shuhai

doi:10.1016/j.precamres.2012.11.004

Cited by 134 publications

(103 citation statements)

References 67 publications

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“…Divergent evolution of such centres is one of the many examples demonstrating that elaborations evolve from ancestral ground patterns [112]. Paleontological evidence of fossilized tracks indicative of directions selected and locations revisited by small bilaterians about 550 million years ago [113] further weaken arguments that such organisms could not accommodate circuitry enabling action selection and allocentric memory [114].…”

Section: (C) Emergence Of Genealogical Correspondence Versus Convergementioning

confidence: 99%

Genealogical correspondence of a forebrain centre implies an executive brain in the protostome–deuterostome bilaterian ancestor

Wolff

Strausfeld

2016

Phil. Trans. R. Soc. B

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One contribution of 16 to a discussion meeting issue 'Homology and convergence in nervous system evolution'. Orthologous genes involved in the formation of proteins associated with memory acquisition are similarly expressed in forebrain centres that exhibit similar cognitive properties. These proteins include cAMP-dependent protein kinase A catalytic subunit (PKA-Ca) and phosphorylated Ca 2þ /calmodulindependent protein kinase II (pCaMKII), both required for long-term memory formation which is enriched in rodent hippocampus and insect mushroom bodies, both implicated in allocentric memory and both possessing corresponding neuronal architectures. Antibodies against these proteins resolve forebrain centres, or their equivalents, having the same ground pattern of neuronal organization in species across five phyla. The ground pattern is defined by olfactory or chemosensory afferents supplying systems of parallel fibres of intrinsic neurons intersected by orthogonal domains of afferent and efferent arborizations with local interneurons providing feedback loops. The totality of shared characters implies a deep origin in the protostomedeuterostome bilaterian ancestor of elements of a learning and memory circuit. Proxies for such an ancestral taxon are simple extant bilaterians, particularly acoels that express PKA-Ca and pCaMKII in discrete anterior domains that can be properly referred to as brains.

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Section: (C) Emergence Of Genealogical Correspondence Versus Convergementioning

confidence: 99%

Genealogical correspondence of a forebrain centre implies an executive brain in the protostome–deuterostome bilaterian ancestor

Wolff

Strausfeld

2016

Phil. Trans. R. Soc. B

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“…On bed tops, Helminthoidichnites displays evidence of avoidance behavior exhibited by parallel spirals and changing depth where crossings occurred. These traces are common in the younger Ediacaran formations from relatively shallower-water environments such as the Ediacara Member of the Rawnsley Quartzite in South Australia (19), the Blueflower Formation of the Mackenzie Mountains of northwest Canada (60), and the Shibantan Member of the Dengjing Formation in south China (61,62). It is unlikely these complicated but definitive trace fossils could have been made by anything other than a bilaterian.…”

Section: Mobility and The Presence Of Bilateriansmentioning

confidence: 99%

The advent of animals: The view from the Ediacaran

Droser

Gehlîng

2015

Proc. Natl. Acad. Sci. U.S.A.

141

111

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Patterns of origination and evolution of early complex life on this planet are largely interpreted from the fossils of the Precambrian soft-bodied Ediacara Biota. These fossils occur globally and represent a diverse suite of organisms living in marine environments. Although these exceptionally preserved fossil assemblages are typically difficult to reconcile with modern phyla, examination of the morphology, ecology, and taphonomy of these taxa provides keys to their relationships with modern taxa. Within the more than 30 million y range of the Ediacara Biota, fossils of these multicellular organisms demonstrate the advent of mobility, heterotrophy by multicellular animals, skeletonization, sexual reproduction, and the assembly of complex ecosystems, all of which are attributes of modern animals. This approach to these fossils, without the constraint of attempting phylogenetic reconstructions, provides a mechanism for comparing these taxa with both living and extinct animals.Ediacara | animals | Ediacaran | South Australia | fossils

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“…Palaeophycus is known from the Late Proterozoic (Ediacaran) to the Holocene (Pemberton and Frey 1982;McCann and Pickerill 1988;Hofmann et al 2011;Chen et al 2013).…”

Section: Palaeophycus Tubularismentioning

confidence: 99%

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Chrząstek¹

2013

Acta Geologica Polonica

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The following trace fossils have been recognised in the Lower Muschelkalk of Raciborowice Gorne (North Sudetic Synclinorium, SW Poland): Archaeonassa fossulata, Balanoglossites triadicus, ?Gastrochaenolites isp., Lockeia isp., Palaeophycus tubularis, Palaeophycus isp., ?Planolites beverleyensis, P. montanus, Planolites isp., ?Protovirgularia isp., Rhizocorallium commune var. auriforme, R. commune var. irregulare, R. jenense, Skolithos linearis, Thalassinoides suevicus and Trypanites weisei. Coprolites and an unidentified trace fossil A are also described. The trace fossils allow the discrimination of five ichnoassociations in the Raciborowice Gorne section: (IA 1) Rhizocorallium- Pholeus, (IA 2) Rhizocorallium-Palaeophycus, (IA 3) Thalassinoides, (IA 4) Trypanites-Balanoglossites and (IA 5) Planolites-Palaeophycus. The Lower Muschelkalk succession was deposited on a shallow carbonate ramp affected by frequent storms. Deposition commenced with sedimentation in a restricted lagoon on the inner ramp with a short episode of sabkha formation. It continued on the middle and outer ramp and then on a skeletal shoal of the outer ramp and in an open basin. Ichnoassociation IA 5 is related to a maximum transgression that commenced with the deposition of the Spiriferina Bed and which probably marked the opening of the Silesian-Moravian Gate. The basin underwent two shallowing episodes, as evidenced by ichnoassociations IA 3-IA 4, resulting in the formation of hardgrounds. Bathymetric changes in the Raciborowice Gorne section correspond well with a general transgressive trend in the Germanic Basin.

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Trace fossil evidence for Ediacaran bilaterian animals with complex behaviors

Cited by 134 publications

References 67 publications

Genealogical correspondence of a forebrain centre implies an executive brain in the protostome–deuterostome bilaterian ancestor

Genealogical correspondence of a forebrain centre implies an executive brain in the protostome–deuterostome bilaterian ancestor

The advent of animals: The view from the Ediacaran

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

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