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Early ontogeny of the Furongian (Cambrian) olenid trilobites Sphaerophthalmus alatus (Boeck, 1838) and Ctenopyge (Mesoctenopyge) tumida Westergård, 1922 from Bornholm, Denmark

Månsson, Kristina LU and Clarkson, Euan N K (2016) In Earth and Environmental Science Transactions of the Royal Society of Edinburgh 106(3). p.171-183
Abstract

The early stages in ontogenetic development are described in the co-occurring Sphaerophthalmus alatus (Boeck, 1838) and Ctenopyge (Mesoctenopyge) tumida Westergård, 1922, using fragmentary but otherwise well-preserved material from Bornholm, Denmark. The former species is a senior synonym of Ctenopyge (Eoctenopyge) angusta Westergård, 1922, as has been recently proposed, but the early stages of S. alatus from Bornholm are appreciably more spiny than those found of the same species in other places in Scandinavia, and spinosity is retained until later in development. Increasing convexity with development and other morphological changes are noted. Pygidia were previously unknown in C. (M.) tumida. Here, they are represented by early... (More)

The early stages in ontogenetic development are described in the co-occurring Sphaerophthalmus alatus (Boeck, 1838) and Ctenopyge (Mesoctenopyge) tumida Westergård, 1922, using fragmentary but otherwise well-preserved material from Bornholm, Denmark. The former species is a senior synonym of Ctenopyge (Eoctenopyge) angusta Westergård, 1922, as has been recently proposed, but the early stages of S. alatus from Bornholm are appreciably more spiny than those found of the same species in other places in Scandinavia, and spinosity is retained until later in development. Increasing convexity with development and other morphological changes are noted. Pygidia were previously unknown in C. (M.) tumida. Here, they are represented by early pygidia. These are shield-shaped, with a very spiny margin and a strong axial spine. The distinction between Sphaerophthalmus and Ctenopyge is discussed.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alum Shale, Leptoplastinae, olenids, Scandinavia, Trilobita
in
Earth and Environmental Science Transactions of the Royal Society of Edinburgh
volume
106
issue
3
pages
13 pages
publisher
Royal Society of Edinburgh
external identifiers
  • scopus:84991209998
  • wos:000387774000002
ISSN
1755-6910
DOI
10.1017/S1755691016000086
language
English
LU publication?
yes
id
f0b0af3b-e4df-41ce-9ee5-9ff808dac167
date added to LUP
2016-10-31 09:15:21
date last changed
2017-01-09 10:42:26
@article{f0b0af3b-e4df-41ce-9ee5-9ff808dac167,
  abstract     = {<p>The early stages in ontogenetic development are described in the co-occurring Sphaerophthalmus alatus (Boeck, 1838) and Ctenopyge (Mesoctenopyge) tumida Westergård, 1922, using fragmentary but otherwise well-preserved material from Bornholm, Denmark. The former species is a senior synonym of Ctenopyge (Eoctenopyge) angusta Westergård, 1922, as has been recently proposed, but the early stages of S. alatus from Bornholm are appreciably more spiny than those found of the same species in other places in Scandinavia, and spinosity is retained until later in development. Increasing convexity with development and other morphological changes are noted. Pygidia were previously unknown in C. (M.) tumida. Here, they are represented by early pygidia. These are shield-shaped, with a very spiny margin and a strong axial spine. The distinction between Sphaerophthalmus and Ctenopyge is discussed.</p>},
  author       = {Månsson, Kristina and Clarkson, Euan N K},
  issn         = {1755-6910},
  keyword      = {Alum Shale,Leptoplastinae,olenids,Scandinavia,Trilobita},
  language     = {eng},
  number       = {3},
  pages        = {171--183},
  publisher    = {Royal Society of Edinburgh},
  series       = {Earth and Environmental Science Transactions of the Royal Society of Edinburgh},
  title        = {Early ontogeny of the Furongian (Cambrian) olenid trilobites Sphaerophthalmus alatus (Boeck, 1838) and Ctenopyge (Mesoctenopyge) tumida Westergård, 1922 from Bornholm, Denmark},
  url          = {http://dx.doi.org/10.1017/S1755691016000086},
  volume       = {106},
  year         = {2016},
}