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A giant Ordovician anomalocaridid

Peter Van Roy UGent and Derek EG Briggs (2011) NATURE. 473(7348). p.510-513
abstract
Anomalocaridids, giant lightly sclerotized invertebrate predators, occur in a number of exceptionally preserved early and middle Cambrian (542-501 million years ago) biotas and have come to symbolize the unfamiliar morphologies displayed by stem organisms in faunas of the Burgess Shale type. They are characterized by a pair of anterior, segmented appendages, a circlet of plates around the mouth, and an elongate segmented trunk lacking true tergites with a pair of flexible lateral lobes per segment(1,2). Disarticulated body parts, such as the anterior appendages and oral circlet, had been assigned to a range of taxonomic groups-but the discovery of complete specimens from the middle Cambrian Burgess Shale showed that these disparate elements all belong to a single kind of animal(3). Phylogenetic analyses support a position of anomalocaridids in the arthropod stem, as a sister group to the euarthropods(4-6). The anomalocaridids were the largest animals in Cambrian communities. The youngest unequivocal examples occur in the middle Cambrian Marjum Formation of Utah(7) but an arthropod retaining some anomalocaridid characteristics is present in the Devonian of Germany(5). Here we report the post-Cambrian occurrence of anomalocaridids, from the Early Ordovician (488-472 million years ago) Fezouata Biota(8) in southeastern Morocco, including specimens larger than any in Cambrian biotas. These giant animals were an important element of some marine communities for about 30 million years longer than previously realized. The Moroccan specimens confirm the presence of a dorsal array of flexible blades attached to a transverse rachis on the trunk segments; these blades probably functioned as gills.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
GREENLAND, DINOCARIDA, EVOLUTION, OPABINIA, BURGESS SHALE, GREAT-APPENDAGE ARTHROPOD
journal title
NATURE
Nature
volume
473
issue
7348
pages
510 - 513
Web of Science type
Article
Web of Science id
000290951300040
JCR category
MULTIDISCIPLINARY SCIENCES
JCR impact factor
36.28 (2011)
JCR rank
1/54 (2011)
JCR quartile
1 (2011)
ISSN
0028-0836
DOI
10.1038/nature09920
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1252164
handle
http://hdl.handle.net/1854/LU-1252164
date created
2011-06-05 22:04:22
date last changed
2016-12-19 15:45:58
@article{1252164,
  abstract     = {Anomalocaridids, giant lightly sclerotized invertebrate predators, occur in a number of exceptionally preserved early and middle Cambrian (542-501 million years ago) biotas and have come to symbolize the unfamiliar morphologies displayed by stem organisms in faunas of the Burgess Shale type. They are characterized by a pair of anterior, segmented appendages, a circlet of plates around the mouth, and an elongate segmented trunk lacking true tergites with a pair of flexible lateral lobes per segment(1,2). Disarticulated body parts, such as the anterior appendages and oral circlet, had been assigned to a range of taxonomic groups-but the discovery of complete specimens from the middle Cambrian Burgess Shale showed that these disparate elements all belong to a single kind of animal(3). Phylogenetic analyses support a position of anomalocaridids in the arthropod stem, as a sister group to the euarthropods(4-6). The anomalocaridids were the largest animals in Cambrian communities. The youngest unequivocal examples occur in the middle Cambrian Marjum Formation of Utah(7) but an arthropod retaining some anomalocaridid characteristics is present in the Devonian of Germany(5). Here we report the post-Cambrian occurrence of anomalocaridids, from the Early Ordovician (488-472 million years ago) Fezouata Biota(8) in southeastern Morocco, including specimens larger than any in Cambrian biotas. These giant animals were an important element of some marine communities for about 30 million years longer than previously realized. The Moroccan specimens confirm the presence of a dorsal array of flexible blades attached to a transverse rachis on the trunk segments; these blades probably functioned as gills.},
  author       = {Van Roy, Peter and Briggs, Derek EG},
  issn         = {0028-0836},
  journal      = {NATURE},
  keyword      = {GREENLAND,DINOCARIDA,EVOLUTION,OPABINIA,BURGESS SHALE,GREAT-APPENDAGE ARTHROPOD},
  language     = {eng},
  number       = {7348},
  pages        = {510--513},
  title        = {A giant Ordovician anomalocaridid},
  url          = {http://dx.doi.org/10.1038/nature09920},
  volume       = {473},
  year         = {2011},
}

Chicago
Van Roy, Peter, and Derek EG Briggs. 2011. “A Giant Ordovician Anomalocaridid.” Nature 473 (7348): 510–513.
APA
Van Roy, P., & Briggs, D. E. (2011). A giant Ordovician anomalocaridid. NATURE, 473(7348), 510–513.
Vancouver
1.
Van Roy P, Briggs DE. A giant Ordovician anomalocaridid. NATURE. 2011;473(7348):510–3.
MLA
Van Roy, Peter, and Derek EG Briggs. “A Giant Ordovician Anomalocaridid.” NATURE 473.7348 (2011): 510–513. Print.