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The Oligocene nannolith Sphenolithus evolutionary lineage; morphometrical insights from the palaeo-equatorial Pacific Ocean

Changes in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary... Full description

Journal Title: Journal of micropalaeontology 2010-05, Vol.29 (1), p.17-35
Main Author: Blaj, Teodora
Other Authors: Henderiks, Jorijntje , Young, Jeremy R , Rehnberg, Emil
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Bath: British Micropalaeontological Society
ID: ISSN: 0262-821X
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recordid: cdi_swepub_primary_oai_DiVA_org_uu_135938
title: The Oligocene nannolith Sphenolithus evolutionary lineage; morphometrical insights from the palaeo-equatorial Pacific Ocean
format: Article
creator:
  • Blaj, Teodora
  • Henderiks, Jorijntje
  • Young, Jeremy R
  • Rehnberg, Emil
subjects:
  • algae
  • biologic evolution
  • biometry
  • Carbonate sediments
  • Cenozoic
  • Earth and Related Environmental Sciences
  • Earth Science with specialization in Historical Geology and Palaeontology
  • Earth sciences
  • East Pacific
  • Equatorial Pacific
  • Evolution
  • evolutionary lineage
  • Exogen geovetenskap
  • Exogenous earth sciences
  • Geologi
  • Geology
  • Geovetenskap
  • Geovetenskap med inriktning mot historisk geologi och paleontologi
  • Geovetenskap och miljövetenskap
  • histograms
  • Historical geology and palaeontology
  • Historisk geologi och paleontologi
  • Leg 199
  • microfossils
  • Morphology
  • morphometry
  • nannofossils
  • Natural Sciences
  • Naturvetenskap
  • North Pacific
  • Northeast Pacific
  • Ocean currents
  • Ocean Drilling Program
  • ODP Leg 199 Site 1218
  • ODP Site 1218
  • Oligocene
  • Pacific Ocean
  • Paleobotany
  • Paleogene
  • Plantae
  • S. ciperoensis
  • S. distentus
  • Sediments
  • SEM data
  • Species
  • SPhenolithus
  • Sphenolithus predistentus
  • statistical analysis
  • taxonomy
  • Tertiary
ispartof: Journal of micropalaeontology, 2010-05, Vol.29 (1), p.17-35
description: Changes in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary lineage. Using differences in their morphology and stratigraphical ranges, the aim of this study was to determine whether these taxa represent an anagenetic evolutionary lineage or a set of discrete species with overlapping stratigraphical ranges. A total of 1215 specimens from 12 samples were analyzed morphometrically and the basal ratio, i.e. the ratio between the basal width and proximal cycle height, was identified as a key parameter for the study of this lineage. We conclude that S. distentus and S. predistentus are intergradational species forming an anagenetic lineage but that S. ciperoensis is a discrete species which evolved relatively abruptly in the late Oligocene.
language: eng
source:
identifier: ISSN: 0262-821X
fulltext: no_fulltext
issn:
  • 0262-821X
  • 2041-4978
  • 2041-4978
url: Link


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titleThe Oligocene nannolith Sphenolithus evolutionary lineage; morphometrical insights from the palaeo-equatorial Pacific Ocean
creatorBlaj, Teodora ; Henderiks, Jorijntje ; Young, Jeremy R ; Rehnberg, Emil
creatorcontribBlaj, Teodora ; Henderiks, Jorijntje ; Young, Jeremy R ; Rehnberg, Emil
descriptionChanges in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary lineage. Using differences in their morphology and stratigraphical ranges, the aim of this study was to determine whether these taxa represent an anagenetic evolutionary lineage or a set of discrete species with overlapping stratigraphical ranges. A total of 1215 specimens from 12 samples were analyzed morphometrically and the basal ratio, i.e. the ratio between the basal width and proximal cycle height, was identified as a key parameter for the study of this lineage. We conclude that S. distentus and S. predistentus are intergradational species forming an anagenetic lineage but that S. ciperoensis is a discrete species which evolved relatively abruptly in the late Oligocene.
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subjectalgae ; biologic evolution ; biometry ; Carbonate sediments ; Cenozoic ; Earth and Related Environmental Sciences ; Earth Science with specialization in Historical Geology and Palaeontology ; Earth sciences ; East Pacific ; Equatorial Pacific ; Evolution ; evolutionary lineage ; Exogen geovetenskap ; Exogenous earth sciences ; Geologi ; Geology ; Geovetenskap ; Geovetenskap med inriktning mot historisk geologi och paleontologi ; Geovetenskap och miljövetenskap ; histograms ; Historical geology and palaeontology ; Historisk geologi och paleontologi ; Leg 199 ; microfossils ; Morphology ; morphometry ; nannofossils ; Natural Sciences ; Naturvetenskap ; North Pacific ; Northeast Pacific ; Ocean currents ; Ocean Drilling Program ; ODP Leg 199 Site 1218 ; ODP Site 1218 ; Oligocene ; Pacific Ocean ; Paleobotany ; Paleogene ; Plantae ; S. ciperoensis ; S. distentus ; Sediments ; SEM data ; Species ; SPhenolithus ; Sphenolithus predistentus ; statistical analysis ; taxonomy ; Tertiary
ispartofJournal of micropalaeontology, 2010-05, Vol.29 (1), p.17-35
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descriptionChanges in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary lineage. Using differences in their morphology and stratigraphical ranges, the aim of this study was to determine whether these taxa represent an anagenetic evolutionary lineage or a set of discrete species with overlapping stratigraphical ranges. A total of 1215 specimens from 12 samples were analyzed morphometrically and the basal ratio, i.e. the ratio between the basal width and proximal cycle height, was identified as a key parameter for the study of this lineage. We conclude that S. distentus and S. predistentus are intergradational species forming an anagenetic lineage but that S. ciperoensis is a discrete species which evolved relatively abruptly in the late Oligocene.
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abstractChanges in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary lineage. Using differences in their morphology and stratigraphical ranges, the aim of this study was to determine whether these taxa represent an anagenetic evolutionary lineage or a set of discrete species with overlapping stratigraphical ranges. A total of 1215 specimens from 12 samples were analyzed morphometrically and the basal ratio, i.e. the ratio between the basal width and proximal cycle height, was identified as a key parameter for the study of this lineage. We conclude that S. distentus and S. predistentus are intergradational species forming an anagenetic lineage but that S. ciperoensis is a discrete species which evolved relatively abruptly in the late Oligocene.
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