Inferences from expressed sequence tags and comparisons with neural cladistics, Crustacean classification: on‐going controversies and unresolved problems, Tardigrades as ‘stem‐group arthropods’: the evidence from the Cambrian fauna, A palaeontological solution to the arthropod head problem, Head structure in upper stem‐group arthropods, MicroRNAs and phylogenomics resolve the phylogenetic relationships of the Tardigrada, and suggest the velvet worms as the sister group of Arthropoda, Beyond the Burgess Shale: Cambrian microfossils track the rise and fall of hallucigeniid lobopodians, Morphology and systematics of the anomalocaridid arthropod, A conserved mode of head segmentation in arthropods revealed by the expression of Hox genes in a spider, Decisive data sets in phylogenomics: lessons from studies on the phylogenetic relationships of primarily wingless insects, Broad phylogenomic sampling improves resolution of the animal tree of life, The xenusian‐to‐anomalocaridid transition within the lobopodians, Morphological data, extant Myriapoda, and the myriapod stem‐group, Arthropod phylogeny: an overview from the perspectives of morphology, molecular data and the fossil record, Palaeomorphology: fossils and the inference of cladistic relationships, Arthropod biology and evolution – molecules, development, morphology, A new leanchoiliid megacheiran arthropod from the lower Cambrian Emu Bay Shale, South Australia, Head patterning and Hox gene expression in an onychophoran and its implications for the arthropod head problem, Arthropod phylogeny based on eight molecular loci and morphology, Sophisticated particle‐feeding in a large Early Cambrian crustacean, Copepod mandible palynomorphs from the Nolichucky Shale (Cambrian, Tennessee): implications for the taphonomy and recovery of small carbonaceous fossils, Exceptionally preserved crustaceans from western Canada reveal a cryptic Cambrian radiation, Mechanisms of eye development and evolution of the arthropod visual system: the lateral eyes of Myriapoda are not modified insect ommatidia, High‐level phylogenetic analysis using developmental sequences: The Cambrian †, Functional morphology, ontogeny and evolution of mantis shrimp‐like predators in the Cambrian, A great‐appendage arthropod with a radial mouth from the Lower Devonian Hunsrück Slate, Germany, Rates of phenotypic and genomic evolution during the Cambrian explosion, Multi‐segmented arthropods from the middle Cambrian of British Columbia (Canada), New middle Cambrian bivalved arthropods from the Burgess Shale, British Columbia, The affinities of the cosmopolitan arthropod, Cambrian bivalved arthropod reveals origins of arthrodisation, Arthropod fossil data increase congruence of morphological and molecular phylogenies, An armoured Cambrian lobopodian from China with arthropod‐like appendages, Complex brain and optic lobes in an early Cambrian arthropod, Morphology of Cambrian lobopodian eyes from the Chengjiang Lagerstätte and their evolutionary significance, The morphology and phylogenetic position of the Cambrian lobopodian, A revision of brain composition in Onychophora (velvet worms) suggests that the tritocerebrum evolved in arthropods, Selective neuronal staining in tardigrades and onychophorans provides insights into the evolution of segmental ganglia in panarthropods, Neural markers reveal a one‐segmented head in tardigrades (water bears), A phylogenomic approach to resolve the arthropod tree of life, Development of the nervous system in the “head” of, Animal evolution: interrelationships of the living phyla, Phylotranscriptomics to bring the understudied into the fold: monophyletic Ostracoda, fossil placement and pancrustacean phylogeny, A rare onychophoran‐like lobopodian from the Lower Cambrian Chengjiang Lagerstätte, southwestern China, and its phylogenetic implications, Cambrian lobopodians and extant onychophorans provide new insights into early cephalization in Panarthropoda, Acute vision in the giant Cambrian predator, The Ediacaran emergence of bilaterians: congruence between the genetic and the geological fossil records, Sources of signal in 62 protein‐coding nuclear genes for higher‐level phylogenetics of arthropods, Arthropod relationships revealed by phylogenomic analysis of nuclear protein‐coding sequences, Dating the arthropod tree based on large‐scale transcriptome data, Pancrustacean phylogeny in the light of new phylogenomic data: support for Remipedia as the possible sister group of Hexapoda, A congruent solution to arthropod phylogeny: phylogenomics, microRNAs and morphology support monophyletic Mandibulata, Serine codon‐usage bias in deep phylogenomics: pancrustacean relationships as a case study, Molecular timetrees reveal a Cambrian colonization of land a new scenario for ecdysozoan evolution, At first sight – functional analysis of Lower Cambrian eye systems, The evolution of arthropod heads: reconciling morphological, developmental and palaeontological evidence, The architecture of the nervous system of, A phylogenetic analysis of the arachnid orders based on morphological characters, A Silurian short‐great‐appendage arthropod, Chelicerate neural ground pattern in a Cambrian great appendage arthropod, Expression of Homeobox genes shows chelicerate arthropods retain their deutocerebral segment, Early Cambrian arthropods – new insights into arthropod head and structural evolution, Evolution of cephalic feeding structures and the phylogeny of Arthropoda, Phylogenomic insights into the Cambrian explosion, the colonization of land and the evolution of flight in Arthropoda, Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages, Specialized appendages in fuxianhuiids and the head organization of early arthropods, An epipodite‐bearing crown‐group crustacean from the Lower Cambrian, A eucrustacean metanauplius from the lower Cambrian, Resolving discrepancy between nucleotides and amino acids in deep‐level arthropod phylogenomics: differentiating serine codons in 21‐amino‐acid models. According to International Commission on Zoological Nomenclature rules, the oldest name takes priority, which in this case would be Anomalocaris.
Journal of Theoretical
2011; Mounce and Wills 2011) and instead resolved Diania more stemward in the lobopodian grade, and a study of new material of Diania cast doubt on the interpretation of the trunk appendages as arthropodized (Ma et al. The drawing notes the ventral spines on the net. Anomalocris
Within Euchelicerata, Xiphosura is sister group of Arachnida, as in traditional morphological trees, but arachnid relationships are poorly resolved apart from strong support for monophyly of Tetrapulmonata and its internal resolution. this ended up being classified under the Peytoia
In contrast, another set of cladistic analyses have more comprehensively sampled fossil taxa and their characters but excluded extant arthropods and nonfossilized characters (e.g. (Fig.
Take your favorite fandoms with you and never miss a beat. Cambrian lobopodians, dinocaridids, bivalved arthropods and fuxianhuiids document the successive appearance of characteristic arthropod features in the stem lineage of Euarthropoda (crown‐group arthropods). body itself seems to have been softer in relation to these parts, Analyses including a more diverse assemblage of nonarthropod taxa have tended to resolve megacheirans as the paraphyletic sister taxon of Euarthropoda (Daley et al. Chelicerata–Mandibulata divergence) as being Ediacaran (Rehm et al.
 Each flap sloped below the one more posterior to it, and this overlapping allowed the lobes on each side of the body to act as a single "fin", maximizing the swimming efficiency.
The Strud crustacean fauna (Late Devonian, Belgium): updated review and palaeoecology of an early continental ecosystem. The Miracrustacea hypothesis, which posits a remipede sister group of hexapods (Figs 1, 3), may aid in refining a search image for a stem‐group hexapod. Copyright © 2020 Elsevier B.V. or its licensors or contributors. 1), such as Altocrustacea, Multicrustacea and Allotriocarida. 2010a, b) and China (Zhang et al.
Ahlberg - 1995.
people have questioned the classical view of Anomalocaris These small, thin spines would have allowed Anomalocaris magnabasis to be a more effective hunter of soft bodied prey, able to pick up and quickly ensnare priapulids and other animals that lacked a hard shell. Later, while clearing what he thought was an unrelated specimen, Harry B. Whittington removed a layer of covering stone to discovered the unequivocally connected arm of thought to be a shrimp tail and mouth thought to be a jellyfish.
briggsi, A. kunmingensis, A. magnabasis, A. pennsylvanica, A. As noted above, no morphological analysis has retrieved some of the groups depicted in the ‘molecular scaffold’ (Fig. In 1928, Danish paleontologist Kai Henriksen proposed that Tuzoia, a Burgess Shale arthropod then known only from the carapace, represented the missing front half of Anomalocaris. different evolutionary line as arthropods as we known them today. The animal looks like a cross between a mantis shrimp, a cuttlefish and a baleen whale, he said.
Coal-Fire Microarthropods From the Centralia, Pennsylvania and Healy, Alaska Mine Fires.
A 425-Million-Year-Old Silurian Pentastomid Parasitic on Ostracods.
The significance of developmental robustness for species diversity.
The traditional concept that chelicerates had lost a deutocerebral segment and that the chelicera was innervated by the tritocerebrum was overturned when the anterior expression domain of labial, the anteriormost gene of the arthropod Hox cluster, was found to align the chelicera with the first antenna of mandibulates (Damen et al. like say a crab shell, but today it seems that this might not be The first fossils of Anomalocaris were found in the Ogygopsis Shale by Joseph Frederick Whiteaves.
- The oral cone of Anomalocaris is not a classic 'Peytoia'.
The information here is completely Improved relaxed clock methods and sounder integration of palaeontological constraints have for the most part nullified the case for arthropod history extending as far back as the Cryogenian, but even modern molecular dates usually estimate the split of Arthropoda from its sister group and the fundamental splits within the arthropod crown group (e.g.