Report Leanchoiliidae reveals the ancestral organization of the stem euarthropod brain
Lan, Tian1,2; Zhao, Yuanlong1; Zhao, Fangchen(赵方臣)3,4; He, You7; Martinez, Pedro5,6; Strausfeld, Nicholas J.8
Source PublicationCURRENT BIOLOGY

Fossils provide insights into how organs may have diversified over geological time.(1) However, diversification already accomplished early in evolution can obscure ancestral events leading to it. For example, already by the mid-Cambrian period, euarthropods had condensed brains typifying modern mandibulate lineages.(2) However, the demonstration that extant euarthropods and chordates share orthologous developmental control genes defining the segmental fore-, mid-, and hindbrain suggests that those character states were present even before the onset of the Cambrian.(3) Fossilized nervous systems of stem Euarthropoda might, therefore, be expected to reveal ancestral segmental organization, from which divergent arrangements emerged. Here, we demonstrate unsurpassed preservation of cerebral tissue in Kaili leanchoiliids revealing near -identical arrangements of bilaterally symmetric ganglia identified as the proto-, deuto-, and tritocerebra disposed behind an asegmental frontal domain, the prosocerebrum, from which paired nerves extend to labral ganglia flanking the stomodeum. This organization corresponds to labral connections hallmarking extant euarthropod clades(4) and to predicted transformations of presegmental ganglia serving raptorial preocular appendages of Radiodonta.(5) Trace nervous system in the gilled lobopodian Kerygmachela kierkegaardi(6) suggests an even deeper prosocerebral ancestry. An asegmental prosocerebrum resolves its location relative to the midline asegmental sclerite of the radiodontan head, which persists in stem Euarthropoda.(7) Here, data from two Kaili Leanchoilia, with additional reference to Alalcomenaeus,(8,9) demonstrate that Cambrian stem Euarthropoda confirm genomic and developmental studies(10-15) claiming that the most frontal domain of the euarthropod brain is a unique evolutionary module distinct from, and ancestral to, the fore-, mid-, and hindbrain.

Indexed BySCI
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41902003] ; Ministerio Ciencia e Innovacion[PGC2018-094173-B-I00] ; National Science Foundation (USA)[1754798]
WOS Research AreaBiochemistry & Molecular Biology ; Life Sciences & Biomedicine - Other Topics ; Cell Biology
WOS SubjectBiochemistry & Molecular Biology ; Biology ; Cell Biology
WOS IDWOS:000718943500009
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Ministerio Ciencia e Innovacion ; National Science Foundation (USA)
Document Type期刊论文
Corresponding AuthorLan, Tian; Strausfeld, Nicholas J.
Affiliation1.Guizhou Univ, Guizhou Res Ctr Palaeobiol, Guiyang, Guizhou, Peoples R China
2.Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 500025, Guizhou, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, Nanjing, Peoples R China
5.Univ Barcelona, Dept Genet Microbiol & Estadist, Barcelona, Spain
6.Inst Catala Recerca & Estudis Avancats ICREA, Passeig Lluis Co, Barcelona 08010, Spain
7.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai, Peoples R China
8.Univ Arizona, Dept Neurosci, Tucson, AZ 85721 USA
Recommended Citation
GB/T 7714
Lan, Tian,Zhao, Yuanlong,Zhao, Fangchen,et al. Report Leanchoiliidae reveals the ancestral organization of the stem euarthropod brain[J]. CURRENT BIOLOGY,2021,31(19):4397-+.
APA Lan, Tian,Zhao, Yuanlong,Zhao, Fangchen,He, You,Martinez, Pedro,&Strausfeld, Nicholas J..(2021).Report Leanchoiliidae reveals the ancestral organization of the stem euarthropod brain.CURRENT BIOLOGY,31(19),4397-+.
MLA Lan, Tian,et al."Report Leanchoiliidae reveals the ancestral organization of the stem euarthropod brain".CURRENT BIOLOGY 31.19(2021):4397-+.
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