Advanced

Ontogeny and structure of a new, miniaturised and spiny olenid trilobite from Southern Sweden

Clarkson, ENK and Ahlberg, Per LU (2002) In Palaeontology 45. p.1-22
Abstract
Several hundred specimens of a tiny olenid trilobite, Ctenopyge ceciliae sp. nov., have been found in stinkstone nodules in the upper Cambrian Peltura scarabaeoides Zone in southern Sweden. This exceptionally spinose form is known only from disarticulated specimens, but is quite well preserved, and all growth stages are represented. The early ontogenetic stages are exceptionally small, the protaspis being only half the size of that of the associated Peltura species. There may have been no more than three thoracic segments. Thus the whole ontogeny was compressed, and this together with the very small size of the adult indicates a true miniaturisation. Whereas the likely control of the origin of the tiny C. ceciliae was basically progenesis,... (More)
Several hundred specimens of a tiny olenid trilobite, Ctenopyge ceciliae sp. nov., have been found in stinkstone nodules in the upper Cambrian Peltura scarabaeoides Zone in southern Sweden. This exceptionally spinose form is known only from disarticulated specimens, but is quite well preserved, and all growth stages are represented. The early ontogenetic stages are exceptionally small, the protaspis being only half the size of that of the associated Peltura species. There may have been no more than three thoracic segments. Thus the whole ontogeny was compressed, and this together with the very small size of the adult indicates a true miniaturisation. Whereas the likely control of the origin of the tiny C. ceciliae was basically progenesis, the extreme spinosity had a different origin; allometric growth or possibly peramorphosis. C. ceciliae is small enough for the spines to have appreciably retarded sinking through frictional effects, and this small trilobite is interpreted as a free-swimming or floating form. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Palaeontology
volume
45
pages
1 - 22
publisher
Wiley-Blackwell
external identifiers
  • wos:000173877000001
  • scopus:0036164964
ISSN
1475-4983
DOI
10.1111/1475-4983.00224
language
English
LU publication?
yes
id
62ca5d20-2185-4e3f-80be-2a605b738f4a (old id 343118)
date added to LUP
2007-08-14 16:22:55
date last changed
2017-02-26 03:33:47
@article{62ca5d20-2185-4e3f-80be-2a605b738f4a,
  abstract     = {Several hundred specimens of a tiny olenid trilobite, Ctenopyge ceciliae sp. nov., have been found in stinkstone nodules in the upper Cambrian Peltura scarabaeoides Zone in southern Sweden. This exceptionally spinose form is known only from disarticulated specimens, but is quite well preserved, and all growth stages are represented. The early ontogenetic stages are exceptionally small, the protaspis being only half the size of that of the associated Peltura species. There may have been no more than three thoracic segments. Thus the whole ontogeny was compressed, and this together with the very small size of the adult indicates a true miniaturisation. Whereas the likely control of the origin of the tiny C. ceciliae was basically progenesis, the extreme spinosity had a different origin; allometric growth or possibly peramorphosis. C. ceciliae is small enough for the spines to have appreciably retarded sinking through frictional effects, and this small trilobite is interpreted as a free-swimming or floating form.},
  author       = {Clarkson, ENK and Ahlberg, Per},
  issn         = {1475-4983},
  language     = {eng},
  pages        = {1--22},
  publisher    = {Wiley-Blackwell},
  series       = {Palaeontology},
  title        = {Ontogeny and structure of a new, miniaturised and spiny olenid trilobite from Southern Sweden},
  url          = {http://dx.doi.org/10.1111/1475-4983.00224},
  volume       = {45},
  year         = {2002},
}