An early Cambrian Sidneyia (Arthropoda) resolves the century-long debate of its head organization

Du, Kun-sheng; Bruton, David L.; Yang, Jie; Zhang, Xiguang

doi:10.1007/s11430-022-1019-8

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Specifically, the stick like nature of the exopodite, the rows of lamellae combined with the apparent lack of segmentation, differ from the paddle shaped exopodites thought to characterise the remainder of the group (e.g. Schmidt et al, 2022, Du et al, 2023, and fig. 4 in Ortega Hernández et al, 2013.…”

Section: Diagnosis As For Genus By Monotypymentioning

confidence: 90%

“…We added the character state ‘ringed distribution lamellae’ to Ch. 15 in both matrices (Chen et al, 2019; Du et al, 2019; 2023). Phylogenetic analyses were performed with TNT (Maximum Parsimony) and MrBayes (Bayesian Inference) (Ronquist et al, 2012; Du et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Phylogenetic analyses were performed with MrBayes (Bayesian Inference) (Ronquist et al, 2012). Both the ‘maximum information’ and ‘minimum assumptions’ strategies of ref (Bapst et al, 2018) were utilised on an earlier version of the matrix, in order to confirm that model choice was not a major driver in differences for the results (Du et al 2023). For the final version, the ‘maximum information’ strategy was used, as model choice did not play a large influence on the topologies recovered.…”

Section: Methodsmentioning

confidence: 99%

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Multiple origins of dorsal ecdysial sutures in trilobites and their relatives

Du,

Guo,

Losso

et al. 2023

Preprint

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Euarthropods are an extremely diverse phylum in the modern, and have been since their origination in the early Palaeozoic. They grow through moulting the exoskeleton (ecdysis) facilitated by breaking along lines of weakness (sutures). Artiopodans, a group that includes trilobites and their non-biomineralizing relatives, dominated arthropod diversity in benthic communities during the Palaeozoic. Most trilobites – a hyperdiverse group of tens of thousands of species -moult by breaking the exoskeleton along cephalic sutures, a strategy that has contributed to their high diversity during the Palaeozoic. However, the recent description of similar sutures in early diverging non-trilobite artiopodans mean that it is unclear whether these sutures were evolved deep within Artiopoda, or evolved multiple times within the group. Here we describe new well-preserved material ofAcanthomeridion, a putative early diverging artiopodan, including hitherto unknown details of its ventral anatomy and appendages revealed through CT scanning, highlighting additional possible homologous features betweenAcanthomeridionand trilobites. We used two coding strategies treating structures as homologous or independently derived across multiple phylogenetic analysis techniques (parsimony or Bayesian inference), and showed that regardless of these variables, the sutures crucial for the success and growth of the hyperdiverse trilobites evolved multiple times within Artiopoda.

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Section: Diagnosis As For Genus By Monotypymentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Multiple origins of dorsal ecdysial sutures in trilobites and their relatives

Du,

Guo,

Losso

et al. 2023

Preprint

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“…The morphology of post-antennal cephalic appendages is crucial for studies of arthropod evolution, classification, and ecology (Briggs and Whittington, 1997;Whittington, 1980;Wills, 1998;Waloszek et al, 2005;Lamsdell et al, 2013;Yang et al, 2013;Du et al, 2023). Cambrian arthropods' postantennal cephalic appendages suggest a close connection to feeding (Hou and Bergström, 1997;Waloszek et al, 2007;Hou et al, 2017).…”

Section: Post-antennal Cephalic Appendagesmentioning

confidence: 99%

Ventral Morphology and Ecological Implications ofCindarella eucalla(Artiopoda, Xandarellida) from Chengjiang Biota, China

Zhang,

Liu,

Mai

et al. 2024

Preprint

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Artiopoda, an early arthropod group, displays post-antennal appendages resembling trilobite limbs, but relationships with other ealy arthropods remain enigmatic. Limited studies and morphological details hinder the understanding of internal relationships within Artiopoda. Recently, exceptionally well preserved arthropod fossils from the Chengjiang Biota were studied using X-ray computed tomography, revealing detailed morphologies. In this study,Cindarella eucalla, a xandarellid from the Chengjiang Biota, was re-investigated using X-ray computed tomography and fluorescent microscopy to reconstruct its morphology and understand its phylogeny and ecology. This study successfully reconstructed a three-dimensional model ofCindarella eucalla, revealing features, such as spindle-shaped trunk tergites with the anterior six covered by the head shield and axial spines extending from the last four, natant hypostome, four post-antennal cephalic appendage pairs, dorsoventral mismatch existed between trunk tergites and limb pairs. This research suggests thatCindarella eucallacould escape in a very short time when it encounters an enemy, and it probably lived in muddy environments with ample light. Phylogenetic analysis indicates that Xandarellids may have close relationship with concililiterga or a clade composed of Nektaspida + (Conciliterga + (Phytophilaspis pergamena+ Trilobita)).

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Cambrian euarthropod Urokodia aequalis sheds light on the origin of Artiopoda body plan

Liu,

Fu,

et al. 2024

iScience

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An early Cambrian Sidneyia (Arthropoda) resolves the century-long debate of its head organization

Cited by 6 publications

References 28 publications

Multiple origins of dorsal ecdysial sutures in trilobites and their relatives

Multiple origins of dorsal ecdysial sutures in trilobites and their relatives

Ventral Morphology and Ecological Implications ofCindarella eucalla(Artiopoda, Xandarellida) from Chengjiang Biota, China

Cambrian euarthropod Urokodia aequalis sheds light on the origin of Artiopoda body plan

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