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Arthropod appendages from the Weeks Formation Konservat-Lagerstatte: new occurences of anomalocaridids in the Cambrian of Utah, USA

Lerosey-Aubril, Rudy; Hegna, Thomas A.; Babcock, Loren LU ; Bonino, Enrico and Kier, Carlo (2014) In Bulletin of Geosciences 89(2). p.269-282
Abstract
The Guzhangian Weeks Formation (house Range, Utah, USA) contains a virtually unstudied but diverse assemblage of "soft-bodied" organisms. This fauna includes several enigmatic appendages of arthropods that are described in this contribution. Six appendages (two isolated and four paired appendages) are interpreted as frontal appendages of a probably new species of Anomalocaris. They are characterized by a slender morphology, 14 podomeres, ventral spines alternating in size, up to three auxiliary spines per ventral spine, and only two dorsal spines. Another isolated appendage is also tentatively assigned to Anomalocaris, but it exhibits a more robust morphology, a stronger distal tapering, and apparently simple ventral spines, suggesting... (More)
The Guzhangian Weeks Formation (house Range, Utah, USA) contains a virtually unstudied but diverse assemblage of "soft-bodied" organisms. This fauna includes several enigmatic appendages of arthropods that are described in this contribution. Six appendages (two isolated and four paired appendages) are interpreted as frontal appendages of a probably new species of Anomalocaris. They are characterized by a slender morphology, 14 podomeres, ventral spines alternating in size, up to three auxiliary spines per ventral spine, and only two dorsal spines. Another isolated appendage is also tentatively assigned to Anomalocaris, but it exhibits a more robust morphology, a stronger distal tapering, and apparently simple ventral spines, suggesting that it may represent a distinct taxon. These frontal appendages represent the youngest occurrence of anomalocaridids in Laurentia and demonstrate the persistence of older, Burgess Shale-type taxa in the Weeks Formation. An assemblage of four antenniform and six robust and heavily-armed appendages is also described. These are interpreted as the serially arranged, anterior appendages of a single individual of an undetermined arthropod species. This association of three pairs of robust, spiny appendages with two pairs of antenniform structures in a Cambrian arthropod is unique. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arthropoda, Anomalocarididae, Weeks Formation, Konservat-Lagerstatte, Cambrian, Guzhangian
in
Bulletin of Geosciences
volume
89
issue
2
pages
269 - 282
publisher
Czech Geological Survey
external identifiers
  • wos:000336622700008
ISSN
1214-1119
DOI
10.3140/bull.geosci.1442
language
English
LU publication?
yes
id
d676876c-22a4-4e61-872f-290e5cd189e1 (old id 4552293)
date added to LUP
2014-07-17 09:53:24
date last changed
2016-04-15 16:36:33
@article{d676876c-22a4-4e61-872f-290e5cd189e1,
  abstract     = {The Guzhangian Weeks Formation (house Range, Utah, USA) contains a virtually unstudied but diverse assemblage of "soft-bodied" organisms. This fauna includes several enigmatic appendages of arthropods that are described in this contribution. Six appendages (two isolated and four paired appendages) are interpreted as frontal appendages of a probably new species of Anomalocaris. They are characterized by a slender morphology, 14 podomeres, ventral spines alternating in size, up to three auxiliary spines per ventral spine, and only two dorsal spines. Another isolated appendage is also tentatively assigned to Anomalocaris, but it exhibits a more robust morphology, a stronger distal tapering, and apparently simple ventral spines, suggesting that it may represent a distinct taxon. These frontal appendages represent the youngest occurrence of anomalocaridids in Laurentia and demonstrate the persistence of older, Burgess Shale-type taxa in the Weeks Formation. An assemblage of four antenniform and six robust and heavily-armed appendages is also described. These are interpreted as the serially arranged, anterior appendages of a single individual of an undetermined arthropod species. This association of three pairs of robust, spiny appendages with two pairs of antenniform structures in a Cambrian arthropod is unique.},
  author       = {Lerosey-Aubril, Rudy and Hegna, Thomas A. and Babcock, Loren and Bonino, Enrico and Kier, Carlo},
  issn         = {1214-1119},
  keyword      = {Arthropoda,Anomalocarididae,Weeks Formation,Konservat-Lagerstatte,Cambrian,Guzhangian},
  language     = {eng},
  number       = {2},
  pages        = {269--282},
  publisher    = {Czech Geological Survey},
  series       = {Bulletin of Geosciences},
  title        = {Arthropod appendages from the Weeks Formation Konservat-Lagerstatte: new occurences of anomalocaridids in the Cambrian of Utah, USA},
  url          = {http://dx.doi.org/10.3140/bull.geosci.1442},
  volume       = {89},
  year         = {2014},
}