65 Citations
Fossils from South China redefine the ancestral euarthropod body plan
- BiologyBMC Evolutionary Biology
- 2020
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.
An early Cambrian euarthropod with radiodont-like raptorial appendages
- Biology, Environmental ScienceNature
- 2020
The phylogenetic reconstruction recovers Kylinxia as a transitional taxon that bridges Radiodonta and Deuteropoda, providing insights into the phylogenetic relationships among early euarthropods, the evolutionary transformations and disparity of frontalmost appendages, and the origin of crucial evolutionary innovations in this clade.
Burgess Shale fossils illustrate the origin of the mandibulate body plan
- BiologyNature
- 2017
The presence of crustaceomorph traits in the Cambrian larvae of various clades basal to Mandibulata is reinterpreted as evidence for the existence of distinct ontogenetic niches among stem arthropods and Hymenocarines now illustrate that the subdivision of the basipod and the presence of proximal endites are likely to have been ancestral conditions critical for the evolution of coxal and pre-coxal features in mandibulates.
Ecdysis in a stem-group euarthropod from the early Cambrian of China
- BiologyScientific Reports
- 2019
This fossil is interpreted as a discarded exoskeleton overlying the carcass of an emerging individual of Alacaris mirabilis, which offers the stratigraphically and phylogenetically earliest direct evidence of ecdysis within total-group Euarthropoda, and represents one of the oldest examples of this growth strategy in the evolution of Ecdysozoa.
Early fossil record of Euarthropoda and the Cambrian Explosion
- Geography, Environmental ScienceProceedings of the National Academy of Sciences
- 2018
While each of the major types of fossil evidence have their limitations and are incomplete in different ways, when taken together they allow a coherent picture to emerge of the origin and subsequent radiation of total group Euarthropoda during the Cambrian.
Before trilobite legs: Pygmaclypeatus daziensis reconsidered and the ancestral appendicular organization of Cambrian artiopods
- Environmental Science, BiologybioRxiv
- 2021
Pygmaclypeatus daziensis shows that appendage heteronomy is phylogenetically widespread within Artiopoda – the megadiverse clade that includes trilobites and their relatives with non-biomineralizing exoskeletons – and suggests that a single exopodite lobe with paddle-like lamellae is ancestral for this clade.
Neuroanatomy in a middle Cambrian mollisoniid and the ancestral nervous system organization of chelicerates
- MedicineNature communications
- 2022
A preserved central nervous system in the soft-bodied stem-group chelicerate Mollisonia symmetrica from the mid-Cambrian Burgess Shale is described and a conflict between the phylogenetic signals provided by neuroanatomical and appendicular data is revealed, which is interpreted as evidence of mosaic evolution in theChelicerate stem-lineage.
Proclivity of nervous system preservation in Cambrian Burgess Shale-type deposits
- GeographyProceedings of the Royal Society B
- 2019
The spatio-temporal recurrence of fossilized neural tissues in Cambrian Konservat-Lagerstätten across North America and South China indicates that their preservation is consistent with the mechanism of Burgess Shale-type fossilization, without the need to invoke alternative taphonomic pathways or the presence of microbial biofilms.
The nature of non-appendicular anterior paired projections in Palaeozoic total-group Euarthropoda.
- Biology, Environmental ScienceArthropod structure & development
- 2016
Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head
- BiologyNature Communications
- 2018
It is shown that Kerygmachela from Sirius Passet, North Greenland, a primitive stem-group euarthropod, exhibits a diminutive brain that innervates both the eyes and frontal appendages, and it is suggested that the complex compound eyes in arthropods evolved from simple ocelli, present in onychophorans and tardigrades, rather than through the incorporation of a set of modified limbs.
References
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A giant Ordovician anomalocaridid
- Geography, Environmental ScienceNature
- 2011
Phylogenetic analyses support a position of anomalocaridids in the arthropod stem, as a sister group to the euarthropods, and confirm the presence of a dorsal array of flexible blades attached to a transverse rachis on the trunk segments.
Specialized appendages in fuxianhuiids and the head organization of early euarthropods
- BiologyNature
- 2013
The presence of a pair of specialized post-antennal appendages (SPAs) in the fuxianhuiid head, which attach at either side of the posteriorly directed mouth, behind the hypostome, indicates that antenniform deutocerebral appendages with many podomeres are a plesiomorphic feature of the ancestral euarthropod head.
HEAD STRUCTURE IN UPPER STEM‐GROUP EUARTHROPODS
- Geography
- 2008
The headures of several important taxa, Fuxianhuia, Canadaspis, Odaraia, Chengjiangocaris and Branchiocaris are redescribed, revealing the essential similarity between them, including an anterior sclerite that appears to be a widespread feature of basal arthropods.
Morphology of Anomalocaris canadensis from the Burgess Shale
- BiologyJournal of Paleontology
- 2014
It is shown that Anomalocaris canadensis is critical for understanding the functional morphology of the group as a whole and corroborating its arthropod affinities, and some of these structures have not been identified in other anomalocaridids.
The Arthropod Odaraia alata Walcott, Middle Cambrian, Burgess Shale, British Columbia
- Biology, Environmental Science
- 1981
O. alata shows some similarities to the Crustacea, particularly the Branchiopoda, but the preservation of the features of the cephalon is inadequate to allow its affinities to be determined unequivocally.
A palaeontological solution to the arthropod head problem
- Environmental ScienceNature
- 2002
It is shown that a group of previously problematic Cambrian arthropods from the Burgess Shale and Chengjiang faunas form a clade close to crown-group euarthropods, the group containing myriapods, chelicerates, insects and crustaceans, and two pre-oral appendages.
Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah
- Environmental Science, Geography
- 2013
In Cambrian fossil Lagerstätten like the Burgess Shale, exceptionally preserved arthropods constitute a large part of the taxonomic diversity, providing opportunities to study the early evolution of…
Chelicerate neural ground pattern in a Cambrian great appendage arthropod
- BiologyNature
- 2013
Alalcomenaeus and Fuxianhuia protensa demonstrate that the two main configurations of the brain observed in modern arthropods, those of Chelicerata and Mandibulata, respectively, had evolved by the early Cambrian.
A restudy of the Burgess Shale (Cambrian) arthropod Emeraldella brocki and reassessment of its affinities
- Biology
- 2012
It is shown that the morphology of the Burgess Shale arthropod Emeraldella brocki is more plesiomorphic than previously assumed, particularly regarding tagmosis, and 'Great appendage' arthropods, traditionally included in the Arachnomorpha, are retrieved as sister to the Crustacea sensu lato + Artiopoda clade, which contradicts the arachnomorph concept.