<i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand

Autores
Otero, Rodrigo A.; O'Gorman, José Patricio; Hiller, Norton; O'Keefe, F. Robin; Fordyce, R. Ewan
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A fragmentary plesiosaur skull from lower Maastrichtian levels of the Conway Formation, New Zealand, is redescribed. Originally regarded as pertaining to two separate individuals, we argue that they represent a single individual belonging to a new aristonectine elasmosaurid, Alexandronectes zealandiensis gen. et sp. nov. This new taxon has common morphologies with other aristonectines such as expansion of the pterygoids extending posteriorly beyond the occipital condyle (as observed in Ar. quiriquinensis and probably in Kaiwhekea katiki) and the presence of an ‘A’-shaped squamosal arch in dorsal view. Otherwise, it is distinguished from these latter species by having different paraoccipital processes, a different mandibular glenoid, and an adult skull comparatively smaller than K. katiki and Aristonectes spp. The new taxon is a morphologically intermediate form between the dorsoventrally high skull of K. katiki and the mediolaterally expanded skulls of Aristonectes spp. The studied specimen is the second genus and species and the third report of an aristonectine recovered from lower Maastrichtian beds of New Zealand, emphasizing the diversity of this group in New Zealand and also indicating that aristonectines could include smaller species than those already known.
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Plesiosaur skull
Alexandronectes zealandiensis
New Zealand
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/108315
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/108315
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network_name_str SEDICI (UNLP)
spelling <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New ZealandOtero, Rodrigo A.O'Gorman, José PatricioHiller, NortonO'Keefe, F. RobinFordyce, R. EwanCiencias NaturalesPlesiosaur skullAlexandronectes zealandiensisNew ZealandA fragmentary plesiosaur skull from lower Maastrichtian levels of the Conway Formation, New Zealand, is redescribed. Originally regarded as pertaining to two separate individuals, we argue that they represent a single individual belonging to a new aristonectine elasmosaurid, <i>Alexandronectes zealandiensis</i> gen. et sp. nov. This new taxon has common morphologies with other aristonectines such as expansion of the pterygoids extending posteriorly beyond the occipital condyle (as observed in <i>Ar. quiriquinensis</i> and probably in<i> Kaiwhekea katiki</i>) and the presence of an ‘A’-shaped squamosal arch in dorsal view. Otherwise, it is distinguished from these latter species by having different paraoccipital processes, a different mandibular glenoid, and an adult skull comparatively smaller than <i>K. katiki</i> and <i>Aristonectes</i> spp. The new taxon is a morphologically intermediate form between the dorsoventrally high skull of <i>K. katiki</i> and the mediolaterally expanded skulls of <i>Aristonectes</i> spp. The studied specimen is the second genus and species and the third report of an aristonectine recovered from lower Maastrichtian beds of New Zealand, emphasizing the diversity of this group in New Zealand and also indicating that aristonectines could include smaller species than those already known.Facultad de Ciencias Naturales y Museo2016-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/108315enginfo:eu-repo/semantics/altIdentifier/issn/1937-2809info:eu-repo/semantics/altIdentifier/doi/10.1080/02724634.2015.1054494info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:05:26Zoai:sedici.unlp.edu.ar:10915/108315Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:05:26.734SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
title <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
spellingShingle <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
Otero, Rodrigo A.
Ciencias Naturales
Plesiosaur skull
Alexandronectes zealandiensis
New Zealand
title_short <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
title_full <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
title_fullStr <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
title_full_unstemmed <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
title_sort <i>Alexandronectes zealandiensisgen</i>. et sp. nov., a new aristonectine plesiosaur from the lower Maastrichtian of New Zealand
dc.creator.none.fl_str_mv Otero, Rodrigo A.
O'Gorman, José Patricio
Hiller, Norton
O'Keefe, F. Robin
Fordyce, R. Ewan
author Otero, Rodrigo A.
author_facet Otero, Rodrigo A.
O'Gorman, José Patricio
Hiller, Norton
O'Keefe, F. Robin
Fordyce, R. Ewan
author_role author
author2 O'Gorman, José Patricio
Hiller, Norton
O'Keefe, F. Robin
Fordyce, R. Ewan
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Plesiosaur skull
Alexandronectes zealandiensis
New Zealand
topic Ciencias Naturales
Plesiosaur skull
Alexandronectes zealandiensis
New Zealand
dc.description.none.fl_txt_mv A fragmentary plesiosaur skull from lower Maastrichtian levels of the Conway Formation, New Zealand, is redescribed. Originally regarded as pertaining to two separate individuals, we argue that they represent a single individual belonging to a new aristonectine elasmosaurid, <i>Alexandronectes zealandiensis</i> gen. et sp. nov. This new taxon has common morphologies with other aristonectines such as expansion of the pterygoids extending posteriorly beyond the occipital condyle (as observed in <i>Ar. quiriquinensis</i> and probably in<i> Kaiwhekea katiki</i>) and the presence of an ‘A’-shaped squamosal arch in dorsal view. Otherwise, it is distinguished from these latter species by having different paraoccipital processes, a different mandibular glenoid, and an adult skull comparatively smaller than <i>K. katiki</i> and <i>Aristonectes</i> spp. The new taxon is a morphologically intermediate form between the dorsoventrally high skull of <i>K. katiki</i> and the mediolaterally expanded skulls of <i>Aristonectes</i> spp. The studied specimen is the second genus and species and the third report of an aristonectine recovered from lower Maastrichtian beds of New Zealand, emphasizing the diversity of this group in New Zealand and also indicating that aristonectines could include smaller species than those already known.
Facultad de Ciencias Naturales y Museo
description A fragmentary plesiosaur skull from lower Maastrichtian levels of the Conway Formation, New Zealand, is redescribed. Originally regarded as pertaining to two separate individuals, we argue that they represent a single individual belonging to a new aristonectine elasmosaurid, <i>Alexandronectes zealandiensis</i> gen. et sp. nov. This new taxon has common morphologies with other aristonectines such as expansion of the pterygoids extending posteriorly beyond the occipital condyle (as observed in <i>Ar. quiriquinensis</i> and probably in<i> Kaiwhekea katiki</i>) and the presence of an ‘A’-shaped squamosal arch in dorsal view. Otherwise, it is distinguished from these latter species by having different paraoccipital processes, a different mandibular glenoid, and an adult skull comparatively smaller than <i>K. katiki</i> and <i>Aristonectes</i> spp. The new taxon is a morphologically intermediate form between the dorsoventrally high skull of <i>K. katiki</i> and the mediolaterally expanded skulls of <i>Aristonectes</i> spp. The studied specimen is the second genus and species and the third report of an aristonectine recovered from lower Maastrichtian beds of New Zealand, emphasizing the diversity of this group in New Zealand and also indicating that aristonectines could include smaller species than those already known.
publishDate 2016
dc.date.none.fl_str_mv 2016-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/108315
url http://sedici.unlp.edu.ar/handle/10915/108315
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1937-2809
info:eu-repo/semantics/altIdentifier/doi/10.1080/02724634.2015.1054494
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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