Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides
Three thousand seven hundred disarticulated remains together with several articulated specimens of the Cambrian Series 2 ptychopariid trilobite Strenuaeva inflata Ahlberg and Bergstrom, 1978 have been collected from the Tornetrask area, northern Sweden. The material provides significant new data on...
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Wiley-Blackwell
2011
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Online Access: | https://lup.lub.lu.se/record/1986690 https://doi.org/10.1111/j.1475-4983.2010.01021.x |
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ftulundlup:oai:lup.lub.lu.se:76af34a2-0790-4eca-9b7e-7969224b2e8d 2023-05-15T17:44:42+02:00 Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides Cederstrom, Peter Ahlberg, Per Nilsson, Carin H. Ahlgren, John Eriksson, Mats 2011 https://lup.lub.lu.se/record/1986690 https://doi.org/10.1111/j.1475-4983.2010.01021.x eng eng Wiley-Blackwell https://lup.lub.lu.se/record/1986690 http://dx.doi.org/10.1111/j.1475-4983.2010.01021.x wos:000290590000012 scopus:79956038515 Palaeontology; 54, pp 685-703 (2011) ISSN: 1475-4983 Geology ptychopariid trilobite Strenuaeva inflata dimorphism enrolment functional morphology ontogeny lower Cambrian Sweden contributiontojournal/article info:eu-repo/semantics/article text 2011 ftulundlup https://doi.org/10.1111/j.1475-4983.2010.01021.x 2023-02-01T23:29:16Z Three thousand seven hundred disarticulated remains together with several articulated specimens of the Cambrian Series 2 ptychopariid trilobite Strenuaeva inflata Ahlberg and Bergstrom, 1978 have been collected from the Tornetrask area, northern Sweden. The material provides significant new data on the morphology, ontogeny, moulting and enrolment of the species. Two distinct morphotypes, possibly an expression of sexual dimorphism, are recognized. The morph with a pair of bulbs in the frontal area, interpreted as brood pouches, is considered to represent females. Statistical treatment of the length/width ratio in cranidia reveals isometric growth during ontogeny for both morphotypes. The transition from the meraspid to holaspid ontogenetic period has been established through recognition of the successive development of the number of thoracic segments in articulated late meraspides. Throughout its life cycle, S. inflata went through 11 meraspid degrees and at least 17 holaspid growth stages. Inferred moult ensembles and exuviae reveal the successive opening of cephalic sutures and the function of the rostral plate during exuviation. As in other ellipsocephalid trilobites in which enrolment is known, the pygidium and two or three thoracic segments of S. inflata are concealed beneath the cephalon (spiral enrolment) during complete enrolment. Article in Journal/Newspaper Northern Sweden Lund University Publications (LUP) Palaeontology 54 3 685 703 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology ptychopariid trilobite Strenuaeva inflata dimorphism enrolment functional morphology ontogeny lower Cambrian Sweden |
spellingShingle |
Geology ptychopariid trilobite Strenuaeva inflata dimorphism enrolment functional morphology ontogeny lower Cambrian Sweden Cederstrom, Peter Ahlberg, Per Nilsson, Carin H. Ahlgren, John Eriksson, Mats Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
topic_facet |
Geology ptychopariid trilobite Strenuaeva inflata dimorphism enrolment functional morphology ontogeny lower Cambrian Sweden |
description |
Three thousand seven hundred disarticulated remains together with several articulated specimens of the Cambrian Series 2 ptychopariid trilobite Strenuaeva inflata Ahlberg and Bergstrom, 1978 have been collected from the Tornetrask area, northern Sweden. The material provides significant new data on the morphology, ontogeny, moulting and enrolment of the species. Two distinct morphotypes, possibly an expression of sexual dimorphism, are recognized. The morph with a pair of bulbs in the frontal area, interpreted as brood pouches, is considered to represent females. Statistical treatment of the length/width ratio in cranidia reveals isometric growth during ontogeny for both morphotypes. The transition from the meraspid to holaspid ontogenetic period has been established through recognition of the successive development of the number of thoracic segments in articulated late meraspides. Throughout its life cycle, S. inflata went through 11 meraspid degrees and at least 17 holaspid growth stages. Inferred moult ensembles and exuviae reveal the successive opening of cephalic sutures and the function of the rostral plate during exuviation. As in other ellipsocephalid trilobites in which enrolment is known, the pygidium and two or three thoracic segments of S. inflata are concealed beneath the cephalon (spiral enrolment) during complete enrolment. |
format |
Article in Journal/Newspaper |
author |
Cederstrom, Peter Ahlberg, Per Nilsson, Carin H. Ahlgren, John Eriksson, Mats |
author_facet |
Cederstrom, Peter Ahlberg, Per Nilsson, Carin H. Ahlgren, John Eriksson, Mats |
author_sort |
Cederstrom, Peter |
title |
Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
title_short |
Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
title_full |
Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
title_fullStr |
Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
title_full_unstemmed |
Moulting, ontogeny and sexual dimorphism in the Cambrian ptychopariid trilobite Strenuaeva inflata from the northern Swedish Caledonides |
title_sort |
moulting, ontogeny and sexual dimorphism in the cambrian ptychopariid trilobite strenuaeva inflata from the northern swedish caledonides |
publisher |
Wiley-Blackwell |
publishDate |
2011 |
url |
https://lup.lub.lu.se/record/1986690 https://doi.org/10.1111/j.1475-4983.2010.01021.x |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Palaeontology; 54, pp 685-703 (2011) ISSN: 1475-4983 |
op_relation |
https://lup.lub.lu.se/record/1986690 http://dx.doi.org/10.1111/j.1475-4983.2010.01021.x wos:000290590000012 scopus:79956038515 |
op_doi |
https://doi.org/10.1111/j.1475-4983.2010.01021.x |
container_title |
Palaeontology |
container_volume |
54 |
container_issue |
3 |
container_start_page |
685 |
op_container_end_page |
703 |
_version_ |
1766146985641902080 |