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Intraspecific variation and taphonomic alteration in the Cambrian (Furongian) agnostoid Lotagnostus amerkanus: new information from China

Peng, Shanchi; Babcock, Loren LU ; Zhu, Xuejian; Ahlberg, Per LU ; Terfelt, Fredrik LU and Dai, Tao (2015) In Bulletin of Geosciences 90(2). p.281-306
Abstract
The concept of the agnostoid arthropod species Lotagnostus americanus (Billings, 1860), which has been reported from numerous localities in the upper Furongian Series (Cambrian) of Laurentia, Gondwana, Baltica, Avalonia, and Siberia, is reviewed with emphasis on morphologic and taphonomic information afforded by large collections from Hunan in South China, Xinjiang in Northwest China, and Zhejiang in Southeast China. Comparisons are made with type and topotype material from Quebec, Canada, as well as material from elsewhere in Canada, the USA, the United Kingdom, Sweden, Russia, and Kazakhstan. The new information clarifies the limits of morphologic variability in L. americanus owing to ontogenetic changes and variation within holaspides,... (More)
The concept of the agnostoid arthropod species Lotagnostus americanus (Billings, 1860), which has been reported from numerous localities in the upper Furongian Series (Cambrian) of Laurentia, Gondwana, Baltica, Avalonia, and Siberia, is reviewed with emphasis on morphologic and taphonomic information afforded by large collections from Hunan in South China, Xinjiang in Northwest China, and Zhejiang in Southeast China. Comparisons are made with type and topotype material from Quebec, Canada, as well as material from elsewhere in Canada, the USA, the United Kingdom, Sweden, Russia, and Kazakhstan. The new information clarifies the limits of morphologic variability in L. americanus owing to ontogenetic changes and variation within holaspides, including inferred microevolution. It also provides details on apparent variation of taphonomic origin. The Chinese collections demonstrate a moderately wide variation in L. americanus, indicating that arguments favoring restriction of Lotagnostus species to narrowly defined, geographically restricted forms are unwarranted. Species described as L. trisectus (Salter, 1864), L. asiaticus Troedsson, 1937, and L. punctatus Lu, 1964, for example, fall within the range of variation observed in L. americanus, and are regarded as junior synonyms. The effaced form Lotagnosilis obscurus Palmer, 1955 is removed from synonymy with L. americanus. A review of the stratigraphic distribution of L. americanus as construed here shows that the earliest occurrences of the species in all regions of the world are nearly synchronous. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
China, Cambrian, Furongian, agnostoid, Lotagnostus americanus, Quebec
in
Bulletin of Geosciences
volume
90
issue
2
pages
281 - 306
publisher
Czech Geological Survey
external identifiers
  • wos:000352033100001
  • scopus:84982234892
ISSN
1214-1119
DOI
10.3140/bull.geosci.1500
language
English
LU publication?
yes
id
a8d155e1-d0e4-43c8-a569-2d8ad3fd8617 (old id 5403110)
date added to LUP
2015-05-19 11:30:31
date last changed
2017-04-12 15:57:21
@article{a8d155e1-d0e4-43c8-a569-2d8ad3fd8617,
  abstract     = {The concept of the agnostoid arthropod species Lotagnostus americanus (Billings, 1860), which has been reported from numerous localities in the upper Furongian Series (Cambrian) of Laurentia, Gondwana, Baltica, Avalonia, and Siberia, is reviewed with emphasis on morphologic and taphonomic information afforded by large collections from Hunan in South China, Xinjiang in Northwest China, and Zhejiang in Southeast China. Comparisons are made with type and topotype material from Quebec, Canada, as well as material from elsewhere in Canada, the USA, the United Kingdom, Sweden, Russia, and Kazakhstan. The new information clarifies the limits of morphologic variability in L. americanus owing to ontogenetic changes and variation within holaspides, including inferred microevolution. It also provides details on apparent variation of taphonomic origin. The Chinese collections demonstrate a moderately wide variation in L. americanus, indicating that arguments favoring restriction of Lotagnostus species to narrowly defined, geographically restricted forms are unwarranted. Species described as L. trisectus (Salter, 1864), L. asiaticus Troedsson, 1937, and L. punctatus Lu, 1964, for example, fall within the range of variation observed in L. americanus, and are regarded as junior synonyms. The effaced form Lotagnosilis obscurus Palmer, 1955 is removed from synonymy with L. americanus. A review of the stratigraphic distribution of L. americanus as construed here shows that the earliest occurrences of the species in all regions of the world are nearly synchronous.},
  author       = {Peng, Shanchi and Babcock, Loren and Zhu, Xuejian and Ahlberg, Per and Terfelt, Fredrik and Dai, Tao},
  issn         = {1214-1119},
  keyword      = {China,Cambrian,Furongian,agnostoid,Lotagnostus americanus,Quebec},
  language     = {eng},
  number       = {2},
  pages        = {281--306},
  publisher    = {Czech Geological Survey},
  series       = {Bulletin of Geosciences},
  title        = {Intraspecific variation and taphonomic alteration in the Cambrian (Furongian) agnostoid Lotagnostus amerkanus: new information from China},
  url          = {http://dx.doi.org/10.3140/bull.geosci.1500},
  volume       = {90},
  year         = {2015},
}