Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps.
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| Title: | Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps. |
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| Authors: | Van Roy, Peter, Daley, Allison C., Briggs, Derek E. G. |
| Source: | Nature. 6/4/2015, Vol. 522 Issue 7554, p77-80. 4p. 1 Color Photograph, 13 Diagrams. |
| Subjects: | Homology (Biology), Phylogeny, Animal morphology, Arthropod diversity, Biodiversity research, Arthropoda |
| Abstract: | Exceptionally preserved fossils from the Palaeozoic era provide crucial insights into arthropod evolution, with recent discoveries bringing phylogeny and character homology into sharp focus. Integral to such studies are anomalocaridids, a clade of stem arthropods whose remarkable morphology illuminates early arthropod relationships and Cambrian ecology. Although recent work has focused on the anomalocaridid head, the nature of their trunk has been debated widely. Here we describe new anomalocaridid specimens from the Early Ordovician Fezouata Biota of Morocco, which not only show well-preserved head appendages providing key ecological data, but also elucidate the nature of anomalocaridid trunk flaps, resolving their homology with arthropod trunk limbs. The new material shows that each trunk segment bears a separate dorsal and ventral pair of flaps, with a series of setal blades attached at the base of the dorsal flaps. Comparisons with other stem lineage arthropods indicate that anomalocaridid ventral flaps are homologous with lobopodous walking limbs and the endopod of the euarthropod biramous limb, whereas the dorsal flaps and associated setal blades are homologous with the flaps of gilled lobopodians (for example, Kerygmachela kierkegaardi, Pambdelurion whittingtoni) and exites of the 'Cambrian biramous limb'. This evidence shows that anomalocaridids represent a stage before the fusion of exite and endopod into the 'Cambrian biramous limb', confirming their basal placement in the euarthropod stem, rather than in the arthropod crown or with cycloneuralian worms. Unlike other anomalocaridids, the Fezouata taxon combines head appendages convergently adapted for filter-feeding with an unprecedented body length exceeding 2 m, indicating a new direction in the feeding ecology of the clade. The evolution of giant filter-feeding anomalocaridids may reflect the establishment of highly developed planktic ecosystems during the Great Ordovician Biodiversification Event. [ABSTRACT FROM AUTHOR] |
| Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 103043695 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Van+Roy%2C+Peter%22">Van Roy, Peter</searchLink><br /><searchLink fieldCode="AR" term="%22Daley%2C+Allison+C%2E%22">Daley, Allison C.</searchLink><br /><searchLink fieldCode="AR" term="%22Briggs%2C+Derek+E%2E+G%2E%22">Briggs, Derek E. G.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 6/4/2015, Vol. 522 Issue 7554, p77-80. 4p. 1 Color Photograph, 13 Diagrams. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Homology+%28Biology%29%22">Homology (Biology)</searchLink><br /><searchLink fieldCode="DE" term="%22Phylogeny%22">Phylogeny</searchLink><br /><searchLink fieldCode="DE" term="%22Animal+morphology%22">Animal morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Arthropod+diversity%22">Arthropod diversity</searchLink><br /><searchLink fieldCode="DE" term="%22Biodiversity+research%22">Biodiversity research</searchLink><br /><searchLink fieldCode="DE" term="%22Arthropoda%22">Arthropoda</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Exceptionally preserved fossils from the Palaeozoic era provide crucial insights into arthropod evolution, with recent discoveries bringing phylogeny and character homology into sharp focus. Integral to such studies are anomalocaridids, a clade of stem arthropods whose remarkable morphology illuminates early arthropod relationships and Cambrian ecology. Although recent work has focused on the anomalocaridid head, the nature of their trunk has been debated widely. Here we describe new anomalocaridid specimens from the Early Ordovician Fezouata Biota of Morocco, which not only show well-preserved head appendages providing key ecological data, but also elucidate the nature of anomalocaridid trunk flaps, resolving their homology with arthropod trunk limbs. The new material shows that each trunk segment bears a separate dorsal and ventral pair of flaps, with a series of setal blades attached at the base of the dorsal flaps. Comparisons with other stem lineage arthropods indicate that anomalocaridid ventral flaps are homologous with lobopodous walking limbs and the endopod of the euarthropod biramous limb, whereas the dorsal flaps and associated setal blades are homologous with the flaps of gilled lobopodians (for example, Kerygmachela kierkegaardi, Pambdelurion whittingtoni) and exites of the 'Cambrian biramous limb'. This evidence shows that anomalocaridids represent a stage before the fusion of exite and endopod into the 'Cambrian biramous limb', confirming their basal placement in the euarthropod stem, rather than in the arthropod crown or with cycloneuralian worms. Unlike other anomalocaridids, the Fezouata taxon combines head appendages convergently adapted for filter-feeding with an unprecedented body length exceeding 2 m, indicating a new direction in the feeding ecology of the clade. The evolution of giant filter-feeding anomalocaridids may reflect the establishment of highly developed planktic ecosystems during the Great Ordovician Biodiversification Event. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/nature14256 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 77 Subjects: – SubjectFull: Homology (Biology) Type: general – SubjectFull: Phylogeny Type: general – SubjectFull: Animal morphology Type: general – SubjectFull: Arthropod diversity Type: general – SubjectFull: Biodiversity research Type: general – SubjectFull: Arthropoda Type: general Titles: – TitleFull: Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Van Roy, Peter – PersonEntity: Name: NameFull: Daley, Allison C. – PersonEntity: Name: NameFull: Briggs, Derek E. G. IsPartOfRelationships: – BibEntity: Dates: – D: 04 M: 06 Text: 6/4/2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 00280836 Numbering: – Type: volume Value: 522 – Type: issue Value: 7554 Titles: – TitleFull: Nature Type: main |
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