Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard
In this study plesiosaur limb bones of four specimens from the Late Jurassic of Svalbard have been studied to map gross internal structure and microstructure and compare this to extant marine reptiles and mammals. Two specimens, one juvenile (species A) and one subadult (species B) are from the Adve...
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ftoslouniv:oai:www.duo.uio.no:10852/12552 2023-05-15T13:05:44+02:00 Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard Liebe, Lene Hurum, Jørn Harald 2011-06-16 http://hdl.handle.net/10852/12552 http://urn.nb.no/URN:NBN:no-27887 eng eng http://urn.nb.no/URN:NBN:no-27887 Liebe, Lene. Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard. Masteroppgave, University of Oslo, 2011 http://hdl.handle.net/10852/12552 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Liebe, Lene&rft.title=Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard&rft.inst=University of Oslo&rft.date=2011&rft.degree=Masteroppgave URN:NBN:no-27887 129356 114145172 Fulltext https://www.duo.uio.no/bitstream/handle/10852/12552/1/LenexLiebexMScxthesisx-xwithxerrata.pdf VDP::450 Master thesis Masteroppgave 2011 ftoslouniv 2020-06-21T08:42:09Z In this study plesiosaur limb bones of four specimens from the Late Jurassic of Svalbard have been studied to map gross internal structure and microstructure and compare this to extant marine reptiles and mammals. Two specimens, one juvenile (species A) and one subadult (species B) are from the Adventdalen Group, Janusfjellet subgroup, Agardhfjellet formation, Slottsmøya member, dated as mid-Volgian; one adult (species D) from Agardhfjellet, also dated mid-Volgian; and one juvenile (species C) of unknown age. The bones examined are propodials, phalanges, mesopodials and metapodials. This study is the first to describe the microstructure of the latter two. The inner bone structure fits an active marine animal living in cold water. Many of the features in the present material are often found in animals with rapid growth and high metabolism, including secondary osteons, high vascularization, pits on the outside of the epiphysis, woven and possibly fibro-lamellar bone. The long bones have two endochondral cones in a periosteal sheath, with a small medullary cavity. The propodials have a defined and quite compact cortex in the subadult, a finding that rejects the view that all plesiosaur bones became more porous through ontogeny. There is a microstructural difference between bones from different ontogenetic stages: juvenile bones have no remodeling and not completely ossified endochondral cones. Three bones have regular trabecular rings in a porous cortex, maybe resulting from cyclic growth caused by seasonality, migration or ontogeny. Master Thesis Adventdalen Svalbard Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Adventdalen ENVELOPE(16.264,16.264,78.181,78.181) Agardhfjellet ENVELOPE(18.833,18.833,78.083,78.083) Janusfjellet ENVELOPE(15.833,15.833,78.333,78.333) Slottsmøya ENVELOPE(17.415,17.415,78.046,78.046) Svalbard |
institution |
Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
topic |
VDP::450 |
spellingShingle |
VDP::450 Liebe, Lene Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
topic_facet |
VDP::450 |
description |
In this study plesiosaur limb bones of four specimens from the Late Jurassic of Svalbard have been studied to map gross internal structure and microstructure and compare this to extant marine reptiles and mammals. Two specimens, one juvenile (species A) and one subadult (species B) are from the Adventdalen Group, Janusfjellet subgroup, Agardhfjellet formation, Slottsmøya member, dated as mid-Volgian; one adult (species D) from Agardhfjellet, also dated mid-Volgian; and one juvenile (species C) of unknown age. The bones examined are propodials, phalanges, mesopodials and metapodials. This study is the first to describe the microstructure of the latter two. The inner bone structure fits an active marine animal living in cold water. Many of the features in the present material are often found in animals with rapid growth and high metabolism, including secondary osteons, high vascularization, pits on the outside of the epiphysis, woven and possibly fibro-lamellar bone. The long bones have two endochondral cones in a periosteal sheath, with a small medullary cavity. The propodials have a defined and quite compact cortex in the subadult, a finding that rejects the view that all plesiosaur bones became more porous through ontogeny. There is a microstructural difference between bones from different ontogenetic stages: juvenile bones have no remodeling and not completely ossified endochondral cones. Three bones have regular trabecular rings in a porous cortex, maybe resulting from cyclic growth caused by seasonality, migration or ontogeny. |
author2 |
Hurum, Jørn Harald |
format |
Master Thesis |
author |
Liebe, Lene |
author_facet |
Liebe, Lene |
author_sort |
Liebe, Lene |
title |
Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
title_short |
Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
title_full |
Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
title_fullStr |
Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
title_full_unstemmed |
Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard |
title_sort |
gross internal structure and microstructure of plesiosaur limb bones from the late jurassic of svalbard |
publishDate |
2011 |
url |
http://hdl.handle.net/10852/12552 http://urn.nb.no/URN:NBN:no-27887 |
long_lat |
ENVELOPE(16.264,16.264,78.181,78.181) ENVELOPE(18.833,18.833,78.083,78.083) ENVELOPE(15.833,15.833,78.333,78.333) ENVELOPE(17.415,17.415,78.046,78.046) |
geographic |
Adventdalen Agardhfjellet Janusfjellet Slottsmøya Svalbard |
geographic_facet |
Adventdalen Agardhfjellet Janusfjellet Slottsmøya Svalbard |
genre |
Adventdalen Svalbard |
genre_facet |
Adventdalen Svalbard |
op_relation |
http://urn.nb.no/URN:NBN:no-27887 Liebe, Lene. Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard. Masteroppgave, University of Oslo, 2011 http://hdl.handle.net/10852/12552 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Liebe, Lene&rft.title=Gross internal structure and microstructure of plesiosaur limb bones from the Late Jurassic of Svalbard&rft.inst=University of Oslo&rft.date=2011&rft.degree=Masteroppgave URN:NBN:no-27887 129356 114145172 Fulltext https://www.duo.uio.no/bitstream/handle/10852/12552/1/LenexLiebexMScxthesisx-xwithxerrata.pdf |
_version_ |
1766392377839190016 |