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Morphology, ontogeny and distribution of the Cambrian Series 2 ellipsocephalid trilobite Strenuaeva spinosa from Scandinavia

Cederstrom, Peter; Ahlberg, Per LU ; Babcock, Loren LU ; Ahlgren, John; Hoyberget, Magne and Nilsson, Carin H. (2012) In GFF 134(3). p.157-171
Abstract
The ellipsocephalid trilobite Strenuaeva spinosa occurs widely in Scandinavia in the lower part of the Ornamentaspis? linnarssoni Zone (Cambrian Series 2). Its first appearance is a readily recognisable, widespread biohorizon in Scandinavia. During ontogeny, intergenal spines are lost and the librigenae develop from a generative zone in the genal region. The palpebro-ocular ridges are distinct and connected to the posterior part of the frontal glabellar lobe in the early meraspid period, but eye ridges become separate from the palpebral lobes and the glabella in the late meraspid period. S. spinosa is characterised by large genal spines, distinct axial spines and falcate pleural tips. The spines may have functioned in predation resistance.... (More)
The ellipsocephalid trilobite Strenuaeva spinosa occurs widely in Scandinavia in the lower part of the Ornamentaspis? linnarssoni Zone (Cambrian Series 2). Its first appearance is a readily recognisable, widespread biohorizon in Scandinavia. During ontogeny, intergenal spines are lost and the librigenae develop from a generative zone in the genal region. The palpebro-ocular ridges are distinct and connected to the posterior part of the frontal glabellar lobe in the early meraspid period, but eye ridges become separate from the palpebral lobes and the glabella in the late meraspid period. S. spinosa is characterised by large genal spines, distinct axial spines and falcate pleural tips. The spines may have functioned in predation resistance. S. spinosa also has a small pointed projection at the anterolateral corners of some thoracic pleurae, the function of which is unknown. The presence of five furrows in the cephalic axial lobe of S. spinosa, best expressed in meraspides, suggests that the head of this ellipsocephalid trilobite was composed of six fused primary segments. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
trilobite, ellipsocephalid, biostratigraphy, morphology, ontogeny, Cambrian
in
GFF
volume
134
issue
3
pages
157 - 171
publisher
Geological Society of Sweden
external identifiers
  • wos:000309123300001
  • scopus:84866760781
ISSN
2000-0863
DOI
10.1080/11035897.2012.717963
language
English
LU publication?
yes
id
d16b79a3-8a09-4b4d-bfc2-e3a72dc838be (old id 3191630)
date added to LUP
2012-11-27 08:26:49
date last changed
2017-07-30 03:13:47
@article{d16b79a3-8a09-4b4d-bfc2-e3a72dc838be,
  abstract     = {The ellipsocephalid trilobite Strenuaeva spinosa occurs widely in Scandinavia in the lower part of the Ornamentaspis? linnarssoni Zone (Cambrian Series 2). Its first appearance is a readily recognisable, widespread biohorizon in Scandinavia. During ontogeny, intergenal spines are lost and the librigenae develop from a generative zone in the genal region. The palpebro-ocular ridges are distinct and connected to the posterior part of the frontal glabellar lobe in the early meraspid period, but eye ridges become separate from the palpebral lobes and the glabella in the late meraspid period. S. spinosa is characterised by large genal spines, distinct axial spines and falcate pleural tips. The spines may have functioned in predation resistance. S. spinosa also has a small pointed projection at the anterolateral corners of some thoracic pleurae, the function of which is unknown. The presence of five furrows in the cephalic axial lobe of S. spinosa, best expressed in meraspides, suggests that the head of this ellipsocephalid trilobite was composed of six fused primary segments.},
  author       = {Cederstrom, Peter and Ahlberg, Per and Babcock, Loren and Ahlgren, John and Hoyberget, Magne and Nilsson, Carin H.},
  issn         = {2000-0863},
  keyword      = {trilobite,ellipsocephalid,biostratigraphy,morphology,ontogeny,Cambrian},
  language     = {eng},
  number       = {3},
  pages        = {157--171},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {Morphology, ontogeny and distribution of the Cambrian Series 2 ellipsocephalid trilobite Strenuaeva spinosa from Scandinavia},
  url          = {http://dx.doi.org/10.1080/11035897.2012.717963},
  volume       = {134},
  year         = {2012},
}