Reviewing the bases for a nomenclatural uniformization of the highest taxonomic levels in arthropods

Aria, Cédric

doi:10.1017/s0016756819000475

Cited by 15 publications

(24 citation statements)

References 36 publications

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“…Bushizheia yangi gen. et sp. nov. possesses a fully arthrodised body and limbs and consequently rests comfortably within the Euarthropoda (Aria, 2019). The present data neither confirms nor refutes any of the current interpretations of the homology of cephalic arthropodan appendages and although the phylogenetic position of B. yangi gen. et sp.…”

Section: Resultscontrasting

confidence: 88%

“…Remarks. Bushizheia gen. nov. is ascribed to the total group Euarthropoda -as defined by the presence of fully arthrodised bodies and limbs (Aria, 2019), because it has sclerotised trunk tergites, sclerotisation of post-antennal appendages (see Cotton and Brady, 2004), and does not have any isolated tergites in the cephalic segments (see Ortega-Hernández, 2014).…”

Section: Zoobankorg/86579e18-e8fd-4d59-840f-8a686585e73fmentioning

confidence: 99%

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A new euarthropod with ‘great appendage’-like frontal head limbs from the Chengjiang Lagerstätte, Southwest China

O’Flynn

Audo

Williams

et al. 2020

Palaeontol Electron

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Bushizheia yangi gen. et sp. nov. is a euarthropod species from the Cambrian (Series 2, Stage 3) Chengjiang Lagerstätte, Southwest China. Sclerotised dorsal tergites, sclerotisation of post-frontal head limb appendages, and no isolated cephalic sclerite support the euarthropod affinities of B. yangi gen. et sp. nov. However, the frontal head limbs resemble in morphology the anteroventral raptorial appendage of radiodonts. Although, due to the absence of critical soft anatomy, we cannot elucidate the exact segmental affinities of these raptorial appendages, the possession of 'great appendage'-like frontal head limbs is important for assessing the range of limb morphology evolved by early euarthropods.

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Section: Resultscontrasting

confidence: 88%

Section: Zoobankorg/86579e18-e8fd-4d59-840f-8a686585e73fmentioning

confidence: 99%

A new euarthropod with ‘great appendage’-like frontal head limbs from the Chengjiang Lagerstätte, Southwest China

O’Flynn

Audo

Williams

et al. 2020

Palaeontol Electron

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“…Because the type and extent of body and post-frontal limb arthrodization in isoxyids remain unclear, multisegmented megacheirans, first described more than 30 years ago and now grouped within the family Jianfengiidae fam. nov., represent the earliest unequivocal euarthropods-as defined by the presence of fully arthrodized bodies and limbs [60] (Fig. 5b).…”

Section: Discussionmentioning

confidence: 99%

Fossils from South China redefine the ancestral euarthropod body plan

et al. 2020

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Background: Early Cambrian Lagerstätten from China have greatly enriched our perspective on the early evolution of animals, particularly arthropods. However, recent studies have shown that many of these early fossil arthropods were more derived than previously thought, casting uncertainty on the ancestral euarthropod body plan. In addition, evidence from fossilized neural tissues conflicts with external morphology, in particular regarding the homology of the frontalmost appendage. Results: Here we redescribe the multisegmented megacheirans Fortiforceps and Jianfengia and describe Sklerolibyon maomima gen. et sp. nov., which we place in Jianfengiidae, fam. nov. (in Megacheira, emended). We find that jianfengiids show high morphological diversity among megacheirans, both in trunk ornamentation and head anatomy, which encompasses from 2 to 4 post-frontal appendage pairs. These taxa are also characterized by elongate podomeres likely forming seven-segmented endopods, which were misinterpreted in their original descriptions. Plesiomorphic traits also clarify their connection with more ancestral taxa. The structure and position of the "great appendages" relative to likely sensory antero-medial protrusions, as well as the presence of optic peduncles and sclerites, point to an overall homology with the anterior head of radiodontans. This is confirmed by our Bayesian phylogeny, which places jianfengiids as the basalmost euarthropods, paraphyletic with other megacheirans, and in contiguity with isoxyids and radiodontans. Conclusions: Sklerolibyon and other jianfengiids expand the disparity of megacheirans and suggest that the common euarthropod ancestor possessed a remarkable phenotypic variability associated with the externalized cephalon, as well as endopods that were already heptopodomerous, which differs from previous hypotheses and observations. These animals also demonstrate that the frontalmost pair of arthrodized appendage is homologous between radiodontans and megacheirans, refuting the claim that the radiodontan frontal appendages evolved into the euarthropod labrum, and questioning its protocerebral identity. This evidence based on external anatomy now constitutes a solid benchmark upon which we should address issues of homology, with the help of carefully examined palaeoneurological data.

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“…These are weakly arthrodized, and again, owing to their small size, lack the detail required to allow for a good estimate of their shape, exact number of podomeres and endites. Nevertheless, the total number of podomeres in F. nereidis is assumed to be seven, which is thought to represent the ground pattern in euarthropods [42]. The presence of exopods is inferred based on dark traces which originate near the base of the legs (figures 2 a–d ; 4 e and 5 a ) like in other, similarly preserved arthropods (e.g.…”

Section: Resultsmentioning

confidence: 99%

A possible case of inverted lifestyle in a new bivalved arthropod from the Burgess Shale

Izquierdo-López

Caron

2019

R. Soc. open sci.

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The origin of the arthropod carapace, an enlargement of cephalic tergites, can be traced back to the Cambrian period. However, its disparity and evolution are still not fully understood. Here, we describe a new ‘bivalved’ arthropod, Fibulacaris nereidis gen. et sp. nov., based on 102 specimens from the middle Cambrian (Wuliuan Stage) Burgess Shale, Marble Canyon area in British Columbia's Kootenay National Park, Canada. The laterally compressed carapace covers most of the body. It is fused dorsally and merges anteriorly into a conspicuous postero-ventrally recurved rostrum as long as the carapace and positioned between a pair of backwards-facing pedunculate eyes. The body is homonomous, with approximately 40 weakly sclerotized segments bearing biramous legs with elongate endopods, and ends in a pair of small flap-like caudal rami. Fibulacaris nereidis is interpreted as a suspension feeder possibly swimming inverted, in a potential case of convergence with some branchiopods. A Bayesian phylogenetic analysis places it within a group closely related to the extinct Hymenocarina. Fibulacaris nereidis is unique in its carapace morphology and overall widens the ecological disparity of Cambrian arthropods and suggests that the evolution of a ‘bivalved' carapace and an upside-down lifestyle may have occurred early in stem-group crustaceans.

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Reviewing the bases for a nomenclatural uniformization of the highest taxonomic levels in arthropods

Cited by 15 publications

References 36 publications

A new euarthropod with ‘great appendage’-like frontal head limbs from the Chengjiang Lagerstätte, Southwest China

A new euarthropod with ‘great appendage’-like frontal head limbs from the Chengjiang Lagerstätte, Southwest China

Fossils from South China redefine the ancestral euarthropod body plan

A possible case of inverted lifestyle in a new bivalved arthropod from the Burgess Shale

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