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  1. Article ; Online: Lower Ordovician synziphosurine reveals early euchelicerate diversity and evolution.

    Lustri, Lorenzo / Gueriau, Pierre / Daley, Allison C

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 3808

    Abstract: Euchelicerata is a clade of arthropods comprising horseshoe crabs, scorpions, spiders, mites and ticks, as well as the extinct eurypterids (sea scorpions) and chasmataspidids. The understanding of the ground plans and relationships between these crown- ... ...

    Abstract Euchelicerata is a clade of arthropods comprising horseshoe crabs, scorpions, spiders, mites and ticks, as well as the extinct eurypterids (sea scorpions) and chasmataspidids. The understanding of the ground plans and relationships between these crown-group euchelicerates has benefited from the discovery of numerous fossils. However, little is known regarding the origin and early evolution of the euchelicerate body plan because the relationships between their Cambrian sister taxa and synziphosurines, a group of Silurian to Carboniferous stem euchelicerates with chelicerae and an unfused opisthosoma, remain poorly understood owing to the scarce fossil record of appendages. Here we describe a synziphosurine from the Lower Ordovician (ca. 478 Ma) Fezouata Shale of Morocco. This species possesses five biramous appendages with stenopodous exopods bearing setae in the prosoma and a fully expressed first tergite in the opisthosoma illuminating the ancestral anatomy of the group. Phylogenetic analyses recover this fossil as a member of the stem euchelicerate family Offacolidae, which is characterized by biramous prosomal appendages. Moreover, it also shares anatomical features with the Cambrian euarthropod Habelia optata, filling the anatomical gap between euchelicerates and Cambrian stem taxa, while also contributing to our understanding of the evolution of euchelicerate uniramous prosomal appendages and tagmosis.
    MeSH term(s) Fossils ; Animals ; Biological Evolution ; Phylogeny ; Arthropods/anatomy & histology ; Arthropods/classification ; Arthropods/genetics ; Morocco ; Horseshoe Crabs/anatomy & histology ; Horseshoe Crabs/genetics ; Horseshoe Crabs/classification ; Biodiversity
    Language English
    Publishing date 2024-05-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-48013-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A treasure trove of Cambrian fossils.

    Daley, Allison C

    Science (New York, N.Y.)

    2019  Volume 363, Issue 6433, Page(s) 1284–1285

    MeSH term(s) Biological Evolution ; Biota ; China ; Fossils ; Minerals
    Chemical Substances Minerals
    Language English
    Publishing date 2019-03-18
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aaw8644
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 27: Show issues Location:
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  3. Article ; Online: Evolution: The Battle of the First Animals.

    Daley, Allison C / Antcliffe, Jonathan B

    Current biology : CB

    2019  Volume 29, Issue 7, Page(s) R257–R259

    Abstract: Ctenophores or 'comb-jellies' are marine animals whose relationship to other phyla is uncertain, yet important for understanding major steps in animal evolution. Fossil ctenophores from the Cambrian indicate that ctenophores may have evolved from a ... ...

    Abstract Ctenophores or 'comb-jellies' are marine animals whose relationship to other phyla is uncertain, yet important for understanding major steps in animal evolution. Fossil ctenophores from the Cambrian indicate that ctenophores may have evolved from a sessile, cnidarian-like ancestor.
    MeSH term(s) Animals ; Cnidaria ; Ctenophora ; Fossils ; Phylogeny
    Language English
    Publishing date 2019-05-22
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 1071731-6
    ISSN 1879-0445 ; 0960-9822
    ISSN (online) 1879-0445
    ISSN 0960-9822
    DOI 10.1016/j.cub.2019.02.031
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    In stock of ZB MED Cologne/Königswinter

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  4. Article ; Online: Variations in preservation of exceptional fossils within concretions.

    Saleh, Farid / Clements, Thomas / Perrier, Vincent / Daley, Allison C / Antcliffe, Jonathan B

    Swiss journal of palaeontology

    2023  Volume 142, Issue 1, Page(s) 20

    Abstract: Concretions are an interesting mode of preservation that can occasionally yield fossils with soft tissues. To properly interpret these fossils, an understanding of their fossilization is required. Probabilistic models are useful tools to identify ... ...

    Abstract Concretions are an interesting mode of preservation that can occasionally yield fossils with soft tissues. To properly interpret these fossils, an understanding of their fossilization is required. Probabilistic models are useful tools to identify variations between different Konservat-Lagerstätten that are separated spatially and temporally. However, the application of probabilistic modeling has been limited to Early Paleozoic Konservat-Lagerstätten preserved in shales. In this paper, the patterns of preservation of three concretionary Konservat-Lagerstätten-the Carboniferous Mazon Creek (USA) and Montceau-les-Mines (France), and the Silurian Herefordshire Lagerstätte (UK)-are analyzed using a statistical approach. It is demonstrated that the degree of biotic involvement, i.e., the degree to which a carcass dictates its own preservation, is connected to internal organ conditional probabilities-the probabilities of finding an internal organ associated with another structure such as biomineralized, sclerotized, cuticularized, or cellular body walls. In concretions that are externally forced with little biological mediation (e.g., Herefordshire), all internal organ conditional probabilities are uniform. As biological mediation in concretion formation becomes more pronounced, heterogeneities in conditional probabilities are introduced (e.g., Montceau-les-Mines and Mazon Creek). The three concretionary sites were also compared with previously investigated Konservat-Lagerstätten preserving fossils in shales to demonstrate how the developed probability framework aids in understanding the broad-scale functioning of preservation in Konservat-Lagerstätten.
    Supplementary information: The online version contains supplementary material available at 10.1186/s13358-023-00284-4.
    Language English
    Publishing date 2023-09-14
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2587027-0
    ISSN 1664-2384 ; 1664-2376 ; 0080-7389
    ISSN (online) 1664-2384
    ISSN 1664-2376 ; 0080-7389
    DOI 10.1186/s13358-023-00284-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Vertically migrating

    Pates, Stephen / Daley, Allison C / Legg, David A / Rahman, Imran A

    Proceedings. Biological sciences

    2021  Volume 288, Issue 1953, Page(s) 20210464

    Abstract: The biological pump is crucial for transporting nutrients fixed by surface-dwelling primary producers to demersal animal communities. Indeed, the establishment of an efficient biological pump was likely a key factor enabling the diversification of ... ...

    Abstract The biological pump is crucial for transporting nutrients fixed by surface-dwelling primary producers to demersal animal communities. Indeed, the establishment of an efficient biological pump was likely a key factor enabling the diversification of animals over 500 Myr ago during the Cambrian explosion. The modern biological pump operates through two main vectors: the passive sinking of aggregates of organic matter, and the active vertical migration of animals. The coevolution of eukaryotes and sinking aggregates is well understood for the Proterozoic and Cambrian; however, little attention has been paid to the establishment of the vertical migration of animals. Here we investigate the morphological variation and hydrodynamic performance of the Cambrian euarthropod
    MeSH term(s) Animals ; Biological Evolution ; Fossils ; Membrane Transport Proteins ; Oceans and Seas
    Chemical Substances Membrane Transport Proteins
    Language English
    Publishing date 2021-06-23
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0080-4649 ; 0962-8452 ; 0950-1193
    DOI 10.1098/rspb.2021.0464
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1364: Show issues Location:
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  6. Article ; Online: Anomalocaridids.

    Daley, Allison C

    Current biology : CB

    2013  Volume 23, Issue 19, Page(s) R860–1

    MeSH term(s) Animals ; Bivalvia/anatomy & histology ; Bivalvia/classification ; Bivalvia/physiology ; Fossils
    Language English
    Publishing date 2013-10-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1071731-6
    ISSN 1879-0445 ; 0960-9822
    ISSN (online) 1879-0445
    ISSN 0960-9822
    DOI 10.1016/j.cub.2013.07.008
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    In stock of ZB MED Cologne/Königswinter

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  7. Article ; Online: New opabiniid diversifies the weirdest wonders of the euarthropod stem group.

    Pates, Stephen / Wolfe, Joanna M / Lerosey-Aubril, Rudy / Daley, Allison C / Ortega-Hernández, Javier

    Proceedings. Biological sciences

    2022  Volume 289, Issue 1968, Page(s) 20212093

    Abstract: Once considered 'weird wonders' of the Cambrian, the emblematic Burgess Shale ... ...

    Abstract Once considered 'weird wonders' of the Cambrian, the emblematic Burgess Shale animals
    MeSH term(s) Animals ; Arthropods/anatomy & histology ; Biological Evolution ; Fossils ; Phylogeny
    Language English
    Publishing date 2022-02-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0080-4649 ; 0962-8452 ; 0950-1193
    DOI 10.1098/rspb.2021.2093
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  8. Article ; Online: The evolution of biramous appendages revealed by a carapace-bearing Cambrian arthropod.

    Fu, Dongjing / Legg, David A / Daley, Allison C / Budd, Graham E / Wu, Yu / Zhang, Xingliang

    Philosophical transactions of the Royal Society of London. Series B, Biological sciences

    2022  Volume 377, Issue 1847, Page(s) 20210034

    Abstract: Biramous appendages are a common feature among modern marine arthropods that evolved deep in arthropod phylogeny. The branched appendage of Cambrian arthropods has long been considered as the ancient biramous limb, sparking numerous investigations on its ...

    Abstract Biramous appendages are a common feature among modern marine arthropods that evolved deep in arthropod phylogeny. The branched appendage of Cambrian arthropods has long been considered as the ancient biramous limb, sparking numerous investigations on its origin and evolution. Here, we report a new arthropod,
    MeSH term(s) Animal Shells ; Animals ; Arthropods ; Biological Evolution ; China ; Fossils ; Phylogeny
    Language English
    Publishing date 2022-02-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208382-6
    ISSN 1471-2970 ; 0080-4622 ; 0264-3839 ; 0962-8436
    ISSN (online) 1471-2970
    ISSN 0080-4622 ; 0264-3839 ; 0962-8436
    DOI 10.1098/rstb.2021.0034
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Einzelsignatur: Show issues

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  9. Article: First report of paired ventral endites in a hurdiid radiodont.

    Pates, Stephen / Daley, Allison C / Butterfield, Nicholas J

    Zoological letters

    2019  Volume 5, Page(s) 18

    Abstract: Background: Radiodonta, large Palaeozoic nektonic predators, occupy a pivotal evolutionary position as stem-euarthropods and filled important ecological niches in early animal ecosystems. Analyses of the anatomy and phylogenetic affinity of these large ... ...

    Abstract Background: Radiodonta, large Palaeozoic nektonic predators, occupy a pivotal evolutionary position as stem-euarthropods and filled important ecological niches in early animal ecosystems. Analyses of the anatomy and phylogenetic affinity of these large nektonic animals have revealed the origins of the euarthropod compound eye and biramous limb, and interpretations of their diverse feeding styles have placed various radiodont taxa as primary consumers and apex predators. Critical to our understanding of both radiodont evolution and ecology are the paired frontal appendages; however, the vast differences in frontal appendage morphology between and within different radiodont families have made it difficult to identify the relative timings of character acquisitions for this body part.
    Results: Here we describe a new genus of hurdiid,
    Conclusion: The blade-like endite morphology is shown to be a hurdiid autapomorphy. Two other frontal appendage characters known only in hurdiids, namely auxiliary spines on the distal margin of endites only, and elongate endites on the first five podomeres in the distal articulated region only, predate this innovation.
    Language English
    Publishing date 2019-06-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2809936-9
    ISSN 2056-306X
    ISSN 2056-306X
    DOI 10.1186/s40851-019-0132-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: The fossil record of ecdysis, and trends in the moulting behaviour of trilobites.

    Daley, Allison C / Drage, Harriet B

    Arthropod structure & development

    2016  Volume 45, Issue 2, Page(s) 71–96

    Abstract: Ecdysis, the process of moulting an exoskeleton, is one of the key characters uniting arthropods, nematodes and a number of smaller phyla into Ecdysozoa. The arthropod fossil record, particularly trilobites, eurypterids and decapod crustaceans, yields ... ...

    Abstract Ecdysis, the process of moulting an exoskeleton, is one of the key characters uniting arthropods, nematodes and a number of smaller phyla into Ecdysozoa. The arthropod fossil record, particularly trilobites, eurypterids and decapod crustaceans, yields information on moulting, although the current focus is predominantly descriptive and lacks a broader evolutionary perspective. We here review literature on the fossil record of ecdysis, synthesising research on the behaviour, evolutionary trends, and phylogenetic significance of moulting throughout the Phanerozoic. Approaches vary widely between taxonomic groups, but an overall theme uniting these works suggests that identifying moults in the palaeontological record must take into account the morphology, taphonomy and depositional environment of fossils. We also quantitatively analyse trends in trilobite ecdysis based on a newly generated database of published incidences of moulting behaviour. This preliminary work reveals significant taxonomic and temporal signal in the trilobite moulting fossil record, with free cheek moulting being prevalent across all Orders and throughout the Phanerozoic, and peaks of cephalic moulting in Phacopida during the Ordovician and rostral plate moulting in Redlichiida during the Cambrian. This study and a review of the literature suggest that it is feasible to extract large-scale evolutionary information from the fossil record of moulting.
    MeSH term(s) Animals ; Arthropods/classification ; Arthropods/physiology ; Fossils ; Molting
    Language English
    Publishing date 2016-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2001498-3
    ISSN 1873-5495 ; 1467-8039
    ISSN (online) 1873-5495
    ISSN 1467-8039
    DOI 10.1016/j.asd.2015.09.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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